2004 Jeep Grand Cherokee Owners Manual

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apply the parking brake first, then place the selector in P (Park) position. STARTING AND OPERATING 181 WARNING! Unintended movement of a vehicle could injure those in and near the vehicle. As with all vehicles, you should never exit a vehicle while the engine is running. Before exiting a vehicle, you should always shift the vehicle into P (Park), remove the key from the ignition, and apply the parking brake. Once the key is removed from the ignition, the transmission shift lever is locked in the P (Park) position, securing the vehicle against unwanted movement. Further- more, you should never leave children unattended inside a vehicle. The following indicators should be used to ensure that you have engaged the transmission shift lever into the P (Park) position: 182 STARTING AND OPERATING † When shifting into P (Park), depress the button on the shift lever and firmly move the lever all the way forward until it stops. † Look at the shift indicator window on the console to † When engaged in P (Park), you will not be able to move the shifter rearward without depressing the shift lever button. ensure it is in the P (Park) position. CAUTION! Before moving the shift lever out of P (Park), you must turn the ignition from LOCK to ON so steering wheel and shift lever are released. Otherwise, dam- age to steering column or shifter could result. R—Reverse Use this range only after the vehicle has come to a complete stop. N—Neutral Shift to N (Neutral) when the vehicle is standing for prolonged periods with the engine running. The engine may be started in this range. Set the parking brake if you must leave the vehicle. Overdrive For most city and highway driving. The transmis- sion contains electronically controlled 4th and 5th gears (Overdrives) and will automatically shift from D (Drive) to 4th and 5th gears if the following conditions are present: † The transmission selector is in D (Drive). † The O/D OFF switch has not been activated. † Vehicle speed is above approximately 30 mph (48 † Transmission has reached normal operating tempera- km/h). ture. STARTING AND OPERATING 183 The O/D OFF feature must be selected, if desired, each time the engine is started. When frequent transmission shifting occurs while using overdrive, such as when operating the vehicle under heavy load conditions (for example, in hilly terrain, strong head winds, or trailer towing), turning off over- drive will improve performance and extend transmission life by reducing excessive shifting and heat buildup. 4th and 5th gears (Overdrive) can be locked out by pressing the O/D OFF switch located on side of the gearshift lever. The O/D OFF indicator light will illumi- nate to show that the switch has been activated. When the light is on, 4th and 5th gears (Overdrive) are locked out. Pressing the switch a second time restores the Overdrive function. The lockout feature is useful when towing a trailer or carrying a heavy load. If the vehicle is started in cold outside tempera- NOTE: tures, shifts into Overdrive may be delayed (4.7L engines only). Normal Overdrive and shifting operation will resume when the temperature of the transmission 184 STARTING AND OPERATING reaches the appropriate temperature. Refer to the “Note” under “Torque Converter Clutch” later in this section. If the transmission temperature gets too hot, the trans- mission may downshift out of Overdrive or engage overdrive at higher vehicle speeds (4.7L engines only) until the transmission cools down. After cooldown, Over- drive will resume normal operation. 2—Second For driving slowly in heavy city traffic or on mountain roads where more precise speed control is desirable. Use it also when climbing long grades, and for engine brak- ing when descending moderately steep grades. To pre- vent excessive engine speed, do not exceed 45 mph (72 km/h) in this range. 1—First For driving up very steep hills and for engine braking at low speeds (25 mph (40 km/h) or less) when going downhill. To prevent excessive engine speed do not exceed 25 mph (40 km/h) in this range. CAUTION! Never race the engine with the brakes on and the vehicle in gear, and never hold the vehicle on an incline without applying the brakes. These practices can cause overheating and damage to the transmis- sion. the condition. This may result Over Temperature Mode The transmission electronics constantly monitor the transmission oil temperature. If the transmission gets too hot, the transmission will change the way it shifts to help control in a slightly different feeling or response during normal operation in D (Drive) position. If the transmission becomes hot enough the O/D OFF indicator light and TRANS OVER TEMP warning light in the instrument cluster may come on. After the transmission cools down, it will return to normal operation. Torque Converter Clutch A feature designed to improve fuel economy has been added to the automatic transmission of this vehicle. A clutch within the torque converter engages automatically at calibrated speeds. This may result in a slightly differ- ent feeling or response during normal operation in high gear. When the vehicle speed drops or during accelera- tion, the clutch automatically and smoothly disengages. STARTING AND OPERATING 185 NOTE: † The torque converter clutch will not engage until the transmission fluid and engine coolant are warm (usu- ally after 1–3 miles (1.6–4.8 km) of driving). Because engine speed is higher when the torque converter clutch is not engaged, it may seem as if the transmis- sion is not shifting into “Overdrive” when cold. This is considered a normal condition. Pressing the “O/D OFF” switch will show that the transmission is able to shift into and out of “Overdrive.” † If the vehicle has not been driven for several days, the first few seconds of operation after shifting the trans- mission into gear may seem sluggish. This is due to the transmission fluid partially draining from the torque converter into the transmission. This is considered a normal condition and will not cause damage to the transmission. The torque converter will refill within 5 seconds of shifting from P (Park) into any other gear position. 186 STARTING AND OPERATING Rocking the Vehicle If the vehicle becomes stuck in snow, sand, or mud, it can often be moved by a rocking motion. Move the gear selector rhythmically between “First” and R (Reverse), while applying slight pressure to the accelerator. The least amount of accelerator pedal pressure to main- tain the rocking motion without spinning the wheels or racing the engine is most effective. Racing the engine or spinning the wheels, due to the frustration of not freeing the vehicle, may lead to transmission overheating and failure. Allow the engine to idle with the transmission selector in N (Neutral) for at least one minute after every five rocking-motion cycles. This will minimize overheat- ing and reduce the risk of transmission failure during prolonged efforts to free a stuck vehicle. CAUTION! When “rocking” a stuck vehicle by moving between “First” and R (Reverse), do not spin the wheels faster than 15 mph (24 km/h), or drivetrain damage may result. FOUR-WHEEL DRIVE OPERATION Selec-TracT Operating Instructions/Precautions The Selec-Tract transfer case provides five mode posi- tions — two (rear) wheel drive high mode, part-time four wheel drive high range, full-time four wheel drive high range, neutral, and four wheel drive low range. This transfer case is equipped with an inter-axle differ- ential which allows driving the vehicle in the 4 FULL TIME position at all times on any given road surface including dry hard surfaced roads. The 4 FULL TIME mode allows the front and rear wheels to rotate at different speeds which eliminates driveline binding and component wear that is normally associated with driving the vehicle in the 4 PART TIME position on dry hard surfaced roads. This feature provides the safety, security, and convenience of operating in 4 wheel drive at all times regardless of road conditions. When additional traction is required, the 4 PART TIME and 4LO positions can be used to lock the front and rear driveshafts together through the transfer case inter-axle differential and force the front and rear driveshafts to rotate at the same speed. This is accomplished by simply moving the shift lever to these positions. The 4 PART TIME and 4LO positions are intended for loose, slippery road surfaces only. Driving in the 4 PART TIME and 4LO positions on dry hard surfaced roads may cause in- creased tire wear and damage to driveline components. STARTING AND OPERATING 187 The PART TIME indicator light, located in the instrument panel, alerts the driver that a four wheel drive mode which locks the front and rear driveshafts together has been selected. This light illuminates when the transfer case is shifted to either the 4 PART TIME or 4LO positions. There is no light for the 2WD, 4 FULL TIME, or N (Neutral) positions. NOTE: Do not attempt to make a shift while only the front or rear wheels are spinning. The Selec-Tract trans- fer case is not equipped with a synchronizer and there- fore the front and rear driveshaft speeds must be equal for the shift to take place. Shifting while only the front or rear wheels are spinning can cause damage to the trans- fer case. When operating your vehicle in 4LO, the engine speed is approximately three times that of the 4 ALL TIME position at a given road speed. Take care not to overspeed the engine and do not exceed 25 mph (40 km/h). 188 STARTING AND OPERATING Proper operation of four wheel drive vehicles depends on tires of equal size, type, and circumference on each wheel. Any difference will adversely affect shifting and cause damage to the transfer case. Because four wheel drive provides improved traction, there is a tendency to exceed safe turning and stopping speeds. Do not go faster than road conditions permit. WARNING! You or others could be injured if you leave the vehicle unattended with the transfer case in the N (Neutral) position without first fully engaging the parking brake. The transfer case N (Neutral) position disengages both the front and rear driveshafts from the powertrain and will allow the vehicle to move regardless of the transmission position. The parking brake should always be applied when the driver is not in the vehicle. Shift Positions For additional information on the appropriate use of each transfer case mode position, see the information below: 2WD Rear Wheel Drive High Range — Normal street and highway driving. Dry hard surfaced roads. 4 PART TIME Part Time 4 Wheel Drive High Range — Locks the transfer case inter-axle differential. Forces the front and rear wheels to rotate at the same speed. Additional traction for loose, slippery road surfaces only. 4 FULL TIME Full Time 4 Wheel Drive High Range — Employs inter- axle differential. Allows front and rear wheels to rotate at different speeds. All roads surfaces. N (Neutral) Neutral — Disengages both the front and rear driveshafts from the powertrain. To be used for flat towing behind another vehicle. Refer to “Recreational Towing” in Sec- tion 5 of this manual. 4LO Part Time Four Wheel Drive Low Range — Low speed 4 wheel drive. Locks the transfer case inter-axle differen- tial. Forces the front and rear wheels to rotate at the same speed. Additional traction and maximum pulling power for loose, slippery road surfaces only. Do not exceed 25 mph (40 km/h). STARTING AND OPERATING 189 Shifting Procedure 2WD to 4 PART TIME or 4 PART TIME to 2WD Shifting between 2WD and 4 PART TIME can be made with the vehicle stopped or in motion. If the vehicle is in motion, shifts can be made up to 55 mph (88 km/h). With the vehicle in motion, two momentary releases of the accelerator pedal may be required after shifting. This will 190 STARTING AND OPERATING induce a torque interrupt and allow full engagement of the newly selected position. With the vehicle stationary, it may be necessary to shift from D (Drive) to R (Reverse) and back to D (Drive) after shifting. This will allow full engagement of the newly selected position. Apply a constant force when shifting the transfer case lever. 4 PART TIME to 4 FULL TIME or 4 FULL TIME to 4 PART TIME Shifting between 4 PART TIME and 4 FULL TIME can be made with the vehicle stopped or in motion. If the vehicle is in motion, shifts can be made up to 55 mph (88 km/h). With the vehicle in motion, two momentary releases of the accelerator pedal may be required after shifting. This will induce a torque interrupt and allow full engagement of the newly selected position. With the vehicle stationary, it may be necessary to shift from D (Drive) to R (Reverse) and back to D (Drive) after shifting. This will allow full engagement of the newly selected position. Apply a constant force when shifting the transfer case lever. 4 FULL TIME to 4 LO or 4 LO to 4 FULL TIME With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift the transmission into N (Neutral). While the vehicle is coasting at 2 to 3 mph (3 to 5 km/h), shift the transfer case lever firmly to the desired position. Do not pause in transfer case N (Neutral). NOTE: Pausing in transfer case N (Neutral) in vehicles equipped with an automatic transmission may require shutting the engine OFF to avoid gear clash while completing the shift. If difficulty occurs, shift the trans- mission to N (Neutral), hold foot on brake, and turn the engine OFF. Make shift to desired mode. NOTE: Shifting into or out of 4LO is possible with the vehicle completely stopped, however difficulty may oc- cur due to the mating clutch teeth not being properly aligned. Several attempts may be required for clutch teeth alignment and shift completion to occur. The pre- ferred method is with the vehicle rolling 2 to 3 mph (3 to 5 km/h). Avoid attempting to engage or disengage 4LO with the vehicle moving faster than 2 to 3 mph (3 to 5 km/h). Quadra-Trac IIT Operating Instructions/Precautions — If Equipped The Quadra-Trac IIt transfer case is fully automatic in the normal driving 4 ALL TIME mode. The Quadra-Trac IIt transfer case provides three mode positions — four wheel drive high range, neutral, and four wheel drive low range. This transfer case is fully automatic in the 4 ALL TIME mode. The 4 ALL TIME mode transmits torque to the rear axle during normal driving, similar to a rear wheel drive vehicle. When speed difference is increased between the front and rear driveshafts the majority of engine torque can be transmitted to the front driveshaft. When additional traction is required, the 4LO position can be used to lock the front and rear driveshafts together STARTING AND OPERATING 191 and force the front and rear wheels to rotate at the same speed. The 4LO position is intended for loose, slippery road surfaces only. Driving in the 4LO position on dry hard surfaced roads may cause increased tire wear and damage to driveline components. When operating your vehicle in 4LO, the engine speed is approximately three times that of the 4 ALL TIME position at a given road speed. Take care not to overspeed the engine and do not exceed 25 mph (40 km/h). Proper operation of four wheel drive vehicles depends on tires of equal size, type, and circumference on each wheel. Any difference will adversely affect shifting and cause damage to the transfer case. Because four wheel drive provides improved traction, there is a tendency to exceed safe turning and stopping speeds. Do not go faster than road conditions permit. 192 STARTING AND OPERATING WARNING! Shift Positions You or others could be injured if you leave the vehicle unattended with the transfer case in the N (Neutral) position without first fully engaging the parking brake. The transfer case N (Neutral) position disengages both the front and rear driveshafts from the powertrain and will allow the vehicle to move regardless of the transmission position. The parking brake should always be applied when the driver is not in the vehicle. For additional information on the appropriate use of each transfer case mode position, see the information below: 4 ALL TIME Normal All Wheel Drive High Range — All roads sur- faces such as ice, snow, gravel, sand, and dry hard pavement. N (Neutral) Neutral — Disengages both the front and rear driveshafts from the powertrain. To be used for flat towing behind another vehicle. Refer to “Recreational Towing” in Sec- tion 5 of this manual. 4LO Four Wheel Drive Low Range — Low speed 4 wheel drive. Locks the front and rear driveshafts together. Forces the front and rear wheels to rotate at the same speed. Additional traction and maximum pulling power for loose, slippery road surfaces only. Do not exceed 25 mph (40 km/h). Shifting Procedure 4 ALL TIME to 4 LO or 4 LO to 4 ALL TIME With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift the transmission into N (Neutral). While the vehicle is STARTING AND OPERATING 193 coasting at 2 to 3 mph (3 to 5 km/h), shift the transfer case lever firmly into the desired position. Do not pause in transfer case N (Neutral). NOTE: Pausing in transfer case N (Neutral) in vehicles equipped with an automatic transmission may require shutting the engine OFF to avoid gear clash while completing the shift. If difficulty occurs, shift the trans- mission into N (Neutral), hold foot on brake, and turn the engine OFF. Make shift to desired mode. NOTE: Shifting into or out of 4LO is possible with the vehicle completely stopped, however difficulty may oc- cur due to the mating clutch teeth not being properly aligned. Several attempts may be required for clutch teeth alignment and shift completion to occur. The pre- ferred method is with the vehicle rolling 2 to 3 mph (3 to 5 km/h). Avoid attempting to engage or disengage 4LO with the vehicle moving faster than 2 to 3 mph (3 to 5 km/h). 194 STARTING AND OPERATING Quadra-DriveT System — If Equipped The optional Quadra-Drivet System features three torque transfer couplings. The couplings include Vari- Lok front and rear axles and Quadra-Trac IIt transfer case. The optional Vari-Lok axles are fully automatic and require no driver input to operate. Under normal driving conditions the units function as standard axles balancing torque evenly between left and right wheels. With a traction difference between left and right wheels the coupling will sense a speed difference. As one wheel begins to spin faster than the other, torque will automati- cally transfer from the wheel that has less traction to the wheel that has traction. While the transfer case and axle couplings differ in design, their operation is similar. Follow the Quadra-Trac IIt transfer case shifting infor- mation, preceding this section, for shifting this system. VARI-LOK FRONT AND REAR AXLES — IF EQUIPPED The optional Vari-Lok axle is fully automatic and requires no driver input to operate. Under normal driving condi- tions the unit functions as a standard axle balancing torque evenly between left and right wheels. With a traction difference between left and right wheels the coupling will sense a speed difference. As one wheel begins to spin faster than the other, torque will automati- cally transfer from the wheel that has less traction to the wheel that has traction. PARKING BRAKE To set the parking brake, pull the lever up as firmly as possible. When the parking brake is applied with the ignition ON, the “Brake Warning Light” in the instru- ment cluster will light. NOTE: The instrument cluster “Brake Warning Light” indicates only that the parking brake is applied. It does not indicate the degree of brake application. STARTING AND OPERATING 195 Before leaving the vehicle parked on a hill, you must make sure the parking brake is fully applied and place the gear selector in the P (Park) position. Make certain the transfer case is in gear. Failure to do so may cause the vehicle to roll and cause damage or injury. When parking on a hill, it is important to set the parking brake before placing the gear selector in P (Park), other- wise the load on the transmission locking mechanism may make it difficult to move the selector out of P (Park). The parking brake should always be applied when the driver is not in the vehicle. 196 STARTING AND OPERATING WARNING! † Leaving children unattended in a vehicle is dan- gerous for a number of reasons. A child or others could be injured. Children should be warned not to touch the parking brake or the gear selector lever. Don’t leave the keys in the ignition. A child could operate power windows, other controls, or move the vehicle. † Do not leave children or animals inside parked vehicles in hot weather. Interior heat build up may cause serious injury or death. To release the parking brake, pull up slightly, press the center button, then lower the lever completely. Be sure the parking brake is fully disengaged before driving. Failure to do so can lead to brake failure. NOTE: Parking brake adjustment and maintenance should be performed by your authorized dealer. ANTI-LOCK BRAKE SYSTEM The Anti-Lock Brake System (ABS) is designed to aid the driver in maintaining vehicle control under adverse braking conditions. The system operates with a separate computer to modulate hydraulic pressure to prevent wheel lock-up and help avoid skidding on slippery surfaces. All vehicle wheels and tires must be the same size and type and tires must be properly inflated to produce accurate signals for the computer. WARNING! Significant over or under inflation of tires, or mixing sizes of tires or wheels on the vehicle can lead to loss of braking effectiveness. STARTING AND OPERATING 197 The Anti-Lock Brake System conducts a low-speed self- test at about 12 mph (20 km/h). If you have your foot lightly on the brake while this test is occurring you may feel slight pedal movement. The movement can be more apparent on ice and snow. This is normal. The Anti-Lock Brake System pump motor runs during the self-test at 12 mph (20 km/h) and during an ABS stop. The pump motor makes a low humming noise during operation, which is normal. WARNING! Pumping of the Anti-Lock Brakes will diminish their effectiveness and may lead to an accident. Pumping makes the stopping distance longer. Just press firmly on your brake pedal when you need to slow down or stop. 198 STARTING AND OPERATING WARNING! † Anti-lock system (ABS) cannot prevent the natu- ral laws of physics from acting on the vehicle, nor can it increase braking or steering efficiency be- yond that afforded by the condition of the vehicle brakes and tires or the traction afforded. † The ABS cannot prevent accidents, including those resulting from excessive speed in turns, following another vehicle too closely, or hydro- planing. Only a safe, attentive, and skillful driver can prevent accidents. † The capabilities of an ABS equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others. CAUTION! The Anti-Lock Brake System is subject to possible detrimental effects of electronic interference caused by improperly installed after-market radios or tele- phones. NOTE: During severe braking conditions, a pulsing sensation may occur and a clicking noise will be heard. This is normal, the Anti-Lock Brake System is functioning. indicating that WARNING! To use your brakes and accelerator more safely, follow these tips: † Do not “ride” the brakes by resting your foot on the pedal. This could overheat the brakes and result in longer stopping dis- unpredictable braking action, tances, or brake damage. † When descending mountains or hills, repeated brak- ing can cause brake fade with loss of braking control. Avoid repeated heavy braking by downshifting the transmission or locking out overdrive whenever pos- sible. † Engines may idle at higher speeds during warm-up, which could cause rear wheels to spin and result in loss of vehicle control. Be especially careful while driving on slippery roads, in close-quarter maneuver- ing, parking or stopping. Remember, always engage 4-wheel drive when driving on slippery roads (Selec- Trac only). The Quadra-Trac II transfer case engages four-wheel drive automatically when required. STARTING AND OPERATING 199 † Do not drive too fast for road conditions, especially when roads are wet or slushy. A wedge of water can build up between the tire tread and the road. This hydroplaning action can cause loss of traction, braking ability, and control. Under such conditions, engage 4-wheel drive (Selec-Trac only). † After going through deep water or a car wash, brakes may become wet, resulting in decreased performance and unpredictable braking action. Dry the brakes by gentle, intermittent pedal action while driving at very slow speeds. ON-ROAD DRIVING TIPS Utility vehicles have higher ground clearance and a narrower track to make them capable of performing in a wide variety of off-road applications. Specific design characteristics give them a higher center of gravity than ordinary cars. 200 STARTING AND OPERATING An advantage of the higher ground clearance is a better view of the road, allowing you to anticipate problems. They are not designed for cornering at the same speeds as conventional 2-wheel drive vehicles any more than low- slung sports cars are designed to perform satisfactorily in off-road conditions. If at all possible, avoid sharp turns or abrupt maneuvers. As with other vehicles of this type, failure to operate this vehicle correctly may result in loss of control or vehicle rollover. OFF-ROAD DRIVING TIPS When To Use 4 LO (Low) Range When off-road driving, shift to 4 LO for additional traction in moving forward or descending a hill, for low-speed pulling power or to improve handling and control on slippery or difficult terrain. Also use 4 LO range on the road in rain, ice, snow, mud or sand to get heavy loads rolling, or whenever “High” range four- wheel drive traction is insufficient. In Snow, Mud and Sand In heavy snow, when pulling a load, or for additional control at slower speeds, shift the transmission to a low gear and shift the transfer case to 4 LO if necessary. Don’t shift to a lower gear than necessary to maintain headway. Over-revving the engine can spin the wheels and traction will be lost. Do not downshift on icy or slippery roads, because engine braking may cause skidding and loss of control. Hill Climbing Before climbing a steep hill, shift the transmission to a lower gear and shift the transfer case to 4 LO. Use first gear and 4 LO for very steep hills. If you stall or begin to lose headway while climbing a steep hill, allow your vehicle to come to a stop and immediately apply the brakes. Restart the engine and shift to R (Reverse). Back slowly down the hill allowing the compression braking of the engine and transmission to help regulate your speed. If the brakes are required to control vehicle speed, apply them lightly and avoid locking or skidding the tires. WARNING! If the engine stalls or you lose headway or cannot make it to the top of a steep hill or grade, never attempt to turn around. To do so may result in tipping and rolling the vehicle. Always back care- fully straight down a hill in R (Reverse) gear. Never back down a hill in N (Neutral) using only the brake. Remember, never drive diagonally across a hill-always drive straight up or down. If the wheels start to slip as you approach the crest of a hill, ease off the accelerator and maintain headway by STARTING AND OPERATING 201 turning the front wheels sharply left and right. This will provide fresh “bite” into the surface and will usually provide traction to complete the climb. Traction Downhill Shift the transmission into a low gear and the transfer case to 4 LO range. Let the vehicle go slowly down the hill with all four wheels turning against engine compres- sion drag. This will permit you to control the vehicle speed and direction. When descending mountains or hills, repeated braking can cause brake fade with loss of braking control. Avoid repeated heavy braking by downshifting the transmis- sion whenever possible. 202 STARTING AND OPERATING After Driving Off-Road Off-road operation puts more stress on your vehicle than does most on-road driving. After going off-road it is always a good idea to check for damage. That way you can get any problems taken care of right away and have your vehicle ready when you need it. † Completely inspect the underbody of your vehicle. Check tires, body structure, steering, suspension, and exhaust system for damage. † Check threaded fasteners for looseness, particularly on the chassis, drivetrain components, steering, and sus- pension. Retighten them, if required, and torque to the values specified in the Service Manual. † Check for accumulations of plants or brush. These things could be a fire hazard. They might hide damage to fuel lines, brake hoses, axle pinion seals, and propeller shafts. † After extended operation in mud, sand, water, or similar dirty conditions, have brake rotors, wheels, brake linings, and axle yokes inspected and cleaned as soon as possible. WARNING! Abrasive material in any part of the brakes may cause excessive wear or unpredictable braking. You might not have full braking power when you need it to prevent an accident. If you have been operating your vehicle in dirty conditions, get your brakes checked and cleaned as necessary. † If you experience unusual vibration after driving in mud, slush or similar conditions, check the wheels for impacted material. Impacted material can cause a wheel imbalance and freeing the wheels of it will correct the situation. TIRE SAFETY INFORMATION Tire Markings NOTE: † P(Passenger)-Metric tire sizing is based on U.S. design standards. P-Metric tires have the letter “P” molded into the sidewall preceding the size designation. Ex- ample: P215/65R15 95H. STARTING AND OPERATING 203 † European Metric tire sizing is based on European design standards. Tires designed to this standard have the tire size molded into the sidewall beginning with the section width. The letter 9P9 is absent from this tire size designation. Example: 215/65R15 96H † LT(Light Truck)-Metric tire sizing is based on U.S. design standards. The size designation for LT-Metric tires is the same as for P-Metric tires except for the letters “LT” that are molded into the sidewall preced- ing the size designation. Example: LT235/85R16. † Temporary Spare tires are high pressure compact spares designed for temporary emergency use only. Tires designed to this standard have the letter “T” molded into the sidewall preceding the size designa- tion. Example: T145/80D18 103M. † High Flotation tire sizing is based on U.S. design standards and begins with the tire diameter molded into the sidewall. Example: 31x10.5 R15 LT. 204 STARTING AND OPERATING Tire Sizing Chart Size Designation: EXAMPLE: P = Passenger car tire size based on U.S. design standards (....blank....( = Passenger car tire based on European design standards LT = Light Truck tire based on U.S. design standards T = Temporary Spare tire 31 = Overall Diameter in Inches (in) 215 = Section Width in Milimeters (mm) 65 = Aspect Ratio in Percent (%) —Ratio of section height to section width of tire. 10.5 = Section Width in Inches (in) R = Construction Code —9R9 means Radial Construction. —9D9 means Diagonal or Bias Construction. 15 = Rim Diameter in Inches (in) STARTING AND OPERATING 205 Service Description: 95 = Load Index EXAMPLE: —A numerical code associated with the maximum load a tire can carry. H = Speed Symbol —A symbol indicating the range of speeds at which a tire can carry a load corresponding to its load index under certain operating conditions. —The maximum speed corresponding to the Speed Symbol should only be achieved un- der specified operating conditions. (ie. tire pressure, vehicle loading, road conditions and posted speed limits). Load Identification: (....blank....( = Absence of any text on sidewall of the tire indicates a Standard Load (SL) Tire Extra Load (XL) = Extra Load (or Reinforced) Tire Light Load = Light Load Tire C,D,E = Load range associated with the maximum load a tire can carry at a specified pressure Maximum Load — Maximum Load indicates the maximum load this tire is designed to carry. Maximum Pressure — Maximum Pressure indicates the maximum permissible cold tire inflation pressure for this tire. 206 STARTING AND OPERATING Tire Identification Number (TIN) The TIN may be found on one or both sides of the tire however the date code may only be on one side. Tires with white sidewalls will have the full TIN including date code located on the white sidewall side of the tire. Look for the TIN on the outboard side of black sidewall tires as mounted on the vehicle. If the TIN is not found on the outboard side then you will find it on the inboard side of the tire. DOT = Department of Transportation —This symbol certifies that the tire is in compliance with the U.S. Department of Transportation tire safety standards, and is approved for highway use. EXAMPLE: DOT MA L9 ABCD 0301 MA = Code representing the tire manufacturing location.(2 digits) L9 = Code representing the tire size.(2 digits) ABCD = Code used by tire manufacturer.(1 to 4 digits) 03 = Number representing the week in which the tire was manufactured.(2 digits) —03 means the 3rd week. 01 = Number representing the year in which the tire was manufactured.(2 digits) —01 means the year 2001. —Prior to July 2000, tire manufacturers were only required to have 1 number to represent the year in which the tire was manufactured. Example: 031 could represent the 3rd week of 1981 or 1991. Tire Loading and Tire Pressure Tire and Loading Information Placard STARTING AND OPERATING 207 Tire Placard Location NOTE: Some vehicles have a “Tire and Loading Infor- mation” placard located on the driver’s side “B” pillar. This placard tells you important information about the, 1) number of people that can be carried in the vehicle 2) the total weight your vehicle can carry 3) the tire size designed for your vehicle 4) the cold tire inflation pressures for the front, rear and spare tires. 208 STARTING AND OPERATING Loading The vehicle maximum load on the tire must not exceed the load carrying capacity of the tire on your vehicle. You will not exceed the tire’s load carrying capacity if you adhere to the loading conditions, tire size and cold tire inflation pressures specified on the Tire and Loading Information placard and the Vehicle Loading section of this manual. NOTE: Under a maximum loaded vehicle condition, gross axle weight ratings (GAWR’s) for the front and rear axles must not be exceeded. For further information on GAWR’s, vehicle loading and trailer towing, see the Vehicle Loading section of this manual. To determine the maximum loading conditions of your vehicle, locate the statement “The combined weight of occupants and cargo should never exceed XXX kg or XXX lbs.” on the Tire and Loading Information placard. The combined weight of occupants, cargo/luggage and trailer tongue weight (if applicable) should never exceed the weight referenced here. Steps for Determining Correct Load Limit 1. Locate the statement “The combined weight of occu- pants and cargo should never exceed XXX pounds” on your vehicle’s placard. 2. Determine the combined weight of the driver and passengers that will be riding in your vehicle. 3. Subtract the combined weight of the driver and pas- sengers from XXX kilograms or XXX pounds. 4. The resulting figure equals the available amount of cargo and luggage load capacity. For example, if “XXX” amount equals 1400 lbs. and there will be five 150 lb. passengers in your vehicle, the amount of available cargo and luggage load capacity is 650 lb. (1400–750 (5 x 150) = 650 lb.) 5. Determine the combined weight of luggage and cargo being loaded on the vehicle. That weight may not safely exceed the available cargo and luggage load capacity calculated in step 4. STARTING AND OPERATING 209 6. If your vehicle will be towing a trailer, load from your trailer will be transferred to your vehicle. Consult this manual to determine how this reduces the available cargo and luggage load capacity of your vehicle. NOTE: The following table shows examples on how to calculate total load, cargo/luggage and towing capacities of your vehicle with varying seating configurations and number and size of occupants. This table is for illustra- tion purposes only and may not be accurate for the seating and load carry capacity of your vehicle. NOTE: For the following example the combined weight of occupants and cargo should never exceed 865 lbs. (392 Kg). 210 STARTING AND OPERATING WARNING! 1. Safety— STARTING AND OPERATING 211 Overloading of your tire is dangerous. Overloading can cause tire failure, affect vehicle handling, and increase your stopping distance. Use tires of the recommended load capacity for your vehicle. Never overload them. TIRES — GENERAL INFORMATION Proper tire inflation pressure is essential to the safe and satisfactory operation of your vehicle. Three primary areas are affected by improper tire pressure: WARNING! Improperly inflated tires are dangerous and can cause accidents. † Under inflation increases tire flexing and can result in tire failure. † Over inflation reduces a tire’s ability to cushion shock. Objects on the road and chuck holes can cause damage that results in tire failure. † Unequal tire pressures can cause steering prob- lems. You could lose control of your vehicle. † Overinflated or under inflated tires can affect vehicle handling and can fail suddenly, resulting in loss of vehicle control. Always drive with each tire inflated to the recom- mended pressure. Tire Inflation Pressures The proper cold tire inflation pressure for passenger cars is listed on either the face of the driver’s door or the driver’s side “B” pillar. For vehicles other than passenger cars, the cold tire inflation pressures are listed on either the “B” pillar or the Certification Label. 212 STARTING AND OPERATING 2. Economy— Improper inflation pressures can cause uneven wear patterns to develop across the tire tread. These abnormal wear patterns will reduce tread life resulting in a need for earlier tire replacement. Under inflation also increases tire rolling resistance and results in higher fuel consump- tion. 3. Ride Comfort and Vehicle Stability— Proper tire inflation contributes to a comfortable ride. Over inflation produces a jarring and uncomfortable ride. Both under inflation and over inflation affect the stability of the vehicle and can produce a feeling of sluggish response or over responsiveness in the steering. Unequal tire pressures can cause erratic and unpredict- able steering response. Unequal tire pressure from side to side may cause the vehicle to drift left or right. The tire pressure should be checked and adjusted at least once every month. Check more often if subject to a wide range of outdoor temperatures, as tire pressures vary with temperature changes. Inflation pressures specified on the label are always “Cold Inflation Pressure.” Cold inflation pressure is defined as the tire pressure after the vehicle has been idle for at least 3 hours, or driven less than a mile after a 3 hour period. The cold inflation pressure must not exceed the maximum values molded into the tire sidewall. Tire pressures may increase from 13 to 40 kPa (2 to 6 psi) [0.138 to 0.414 bar] during operation. DO NOT reduce this normal pressure buildup. STARTING AND OPERATING 213 High Speed Operation WARNING! High speed driving with your vehicle under load is dangerous. The added strain on your tires could cause them to fail. You could have a serious accident. Don’t drive a vehicle loaded to maximum capacity at continuous speeds above 75 mph (120 km/h). The manufacturer advocates driving at safe speeds within posted speed limits. Where speed limits or condi- tions are such that the vehicle can be driven at high speeds, correct tire inflation pressure is very important. 214 STARTING AND OPERATING Radial-Ply Tires WARNING! Tire Spinning When stuck in mud, sand, snow, or ice conditions, do not spin your vehicle’s wheels above 35 mph (55 km/h). Combining radial ply tires with other types of tires on your vehicle will cause your vehicle to handle poorly. The instability could cause an accident. Al- ways use radial tires in sets of four. Never combine them with other types of tires. Cuts and punctures in radial tires are repairable only in the tread area because of sidewall flexing. Consult your dealer for radial tire repairs. WARNING! Fast spinning tires can be dangerous. Forces gener- ated by excessive wheel speeds may cause tire dam- age or failure. A tire could explode and injure someone. Do not spin your vehicle’s wheels faster than 35 mph (55 km/h) when you are stuck. And don’t let anyone near a spinning wheel, no matter what the speed. Tread Wear Indicators These indicators are narrow strips 1/16 inch (1.6 mm) thick and are found in the tread pattern grooves. When the tread pattern is worn down to these treadwear indicators, the tires should be replaced. STARTING AND OPERATING 215 Replacement Tires The tires on your new vehicle provide a balance of many characteristics. They should be inspected regularly for wear and correct inflation pressure. The manufacture strongly recommends that you use tires equivalent to the originals in quality and performance when replacement is needed (see section on tread wear indicators). Failure to use equivalent replacement tires may adversely affect the safety, handling, ride and fuel economy of your vehicle. We recommend that you contact your original equipment tire dealer on any questions you may have on tire specifications or capability. Overloading your vehicle, long trips in very hot weather, and driving on bad roads may result in greater wear. CAUTION! Replacing original tires with tires of a different size may result in false speedometer and odometer read- ings. Check with your dealer before replacing tires with a different size. 216 STARTING AND OPERATING WARNING! † Do not use a tire, wheel size or rating other than that specified for your vehicle. Some combinations of unapproved tires and wheels may change suspen- sion dimensions and performance characteristics, resulting in changes to steering, handling, and brak- ing of your vehicle. This can cause unpredictable handling and stress to steering and suspension com- ponents. You could lose control and have an accident resulting in serious injury or death. Use only the tire and wheel sizes with load ratings approved for your vehicle. † Never use a tire smaller than the minimum tire size listed on your vehicle’s tire label. Using a smaller tire could result in tire overloading and failure. You could lose control and have an accident. † Failure to equip your vehicle with tires having adequate speed capability can result in sudden tire failure and loss of vehicle control. † Overloading your tires is dangerous. Overloading can cause tire failure. Use tires of the recommended load capacity for your vehicle - never overload them. wear; Alignment and Balance The suspension components of your vehicle should be inspected and aligned when needed, to obtain maximum tire tread life. Poor suspension alignment may result in: † reduced tread life; † uneven tire wear, such as feathering and one-sided † vehicle pull to the right or to the left. Tires may also cause the vehicle to pull left or right. Alignment will not correct this problem. See your dealer for proper diagnosis of the problem. Improper alignment will not normally cause vehicle vibration, which may be a result of tire and wheel out-of-balance. Proper balancing will reduce vibration and avoid tire cupping and spotty wear. STARTING AND OPERATING 217 TIRE PRESSURE MONITOR SYSTEM — IF EQUIPPED The Tire Pressure Monitor System (TPM) monitors the pressure in all 4 road tires and the full size spare (5 Tire TPM System Only). The TPM system uses wireless technology to monitor tire pressure levels. Sensors, mounted to each wheel as part of the valve stem, transmit tire pressure readings to a receiver located in the over- head console. The tire pressure status is shown in the Electronic Vehicle Information Center (EVIC) display. Refer to “Overhead Console” in Section 3 for more information. The TPM system functions even when the EVIC is not set on the tire pressure display screen. The TPM system informs you of a low or high tire pressure condition. If this occurs, correct your tire infla- tion pressure as soon as possible, and inspect all of your tires. Be sure to use a high quality gauge when adjusting pressure. The TPM system is designed to monitor your tire pressure but will not function as a tire pressure 218 STARTING AND OPERATING gauge. There will be a delay between the instant you adjust the air pressure in a tire and when the system updates the display. The TPM system is not intended to provide you with notification of rapid air loss. The following chart indicates the TPM system pressure levels. A threshold is the level at which the TPM system provides you with an indication. High Pressure Threshold Placard Pressure (Cold) Low Pressure Threshold 45 psi (310 kPa ) 33 psi (227 kPa) 25 psi (172 kPa) NOTE: A TPM system does not replace normal tire maintenance. CAUTION! The TPM system has been optimized for the original equipment tires and wheels. TPM system pressures have been established for the tire size equipped on your vehicle. Undesirable operation or sensor dam- age may result when using replacement equipment that is not of the same size, type, and/or style. Aftermarket wheels can cause sensor damage. Do not use tire sealant or balance beads if your vehicle is equipped with TPM system as damage to the sensors may result. Tire Pressure Monitor System Tire/Wheel Rotation and Sensor Replacement — If Equipped With the 5 Tire TPM System, if a road tire and wheel is replaced by the spare, the TPM system will detect the swap automatically (after the ignition has been cycled) and display SPARE SWAP DETECTED along with a chime. This could take up to 10 minutes with vehicle speed above 25 mph (40 km/h). With the 4 Tire TPM System, if a road tire and wheel is replaced by the spare, the TPM system will display TIRE SENSOR BAD/MISSING. This is due to the spare tire not being equipped with a tire pressure sensor. Once the road tire is repaired and/or installed back on the vehicle with the proper tire pressure the message will be removed. This could take up to 10 minutes with vehicle speed above 25 mph (40 km/h). The tire pressure sensors must be retrained following a wheel rotation or sensor replacement. Refer to “EVIC — Retrain Tire Sensors” in Section 3 for more information. It is necessary to program the EVIC with the new sensor(s) or the new position of each sensor as it is rotated to a different corner of the vehicle. STARTING AND OPERATING 219 If a wheel rotation is not followed by the retrain proce- dure, the system will not properly inform you of the correct vehicle location of a low or high tire pressure. General Information This device complies with part 15 of the FCC rules and RSS 210 of Industry Canada. Operation is subject to the following conditions: † This device may not cause harmful interference. † This device must accept any interference received, including interference that may cause undesired op- eration. The tire pressure sensors are covered under one of the following licenses: United States . . . . . . . . . . . . . . . . . . . . . KR5S120123 Canada . . . . . . . . . . . . . . . . . . . . . . . . 2671-S120123 220 STARTING AND OPERATING TIRE CHAINS Certain models have sufficient tire-to-body clearance to allow use of tire chains. Install chains on rear tires only. Follow these recommendations to guard against damage and excessive tire and chain wear: † Do not install tire chains or traction devices on ve- hicles with larger than P225/75R16 size tires. These tires are too large for sufficient body clearance with chains or other traction devices. † Use SAE class “S” tire chains or traction devices only. † Follow tire chain manufacturer’s instructions for † Install chains snugly and tighten after 1/2 mile (1 km) † Do not exceed 35 mph (56 km/h), unless otherwise † Drive cautiously, avoiding large bumps, potholes and specified by the chain manufacturer. mounting chains. of driving. extreme driving maneuvers. TIRE ROTATION RECOMMENDATIONS Tires on the front and rear axles of vehicles operate at different loads and perform different steering, handling, and braking functions. For these reasons, they wear at unequal rates, and develop irregular wear patterns. These effects can be reduced by timely rotation of tires. The benefits of rotation are especially worthwhile with aggressive tread designs such as those on On/Off Road type tires. Rotation will increase tread life, help to main- tain mud, snow, and wet traction levels, and contribute to a smooth, quiet ride. Follow the recommended tire rotation frequency for your type of driving found in the “Maintenance Schedules” Section of this manual. More frequent rotation is permis- sible if desired. The reasons for any rapid or unusual wear should be corrected prior to rotation being performed. NOTE: The Tire Pressure Monitor system must be retrained following a tire rotation. See your authorized dealer for service. The suggested rotation method is the “forward-cross” shown in the following diagram. STARTING AND OPERATING 221 FUEL REQUIREMENTS Your engine is designed to meet all emis- sions regulations and provide excellent fuel economy and performance when us- ing high quality unleaded gasoline having an octane rating of 87. The use of premium gasoline is not recommended. The use of premium gasoline will provide no benefit over high quality regular gasoline, and in some circumstances may result in poorer performance. NOTE: 4.7L HO Engines (If Equipped): High quality premium unleaded gasoline with an octane rating of 91 is recommended but not required. Light spark knock at low engine speeds is not harmful to your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is required. Engine damage resulting from operation with a heavy spark knock may not be covered by the new vehicle warranty. 222 STARTING AND OPERATING Poor quality gasoline can cause problems such as hard starting, stalling and hesitations. If you experience these symptoms, try another brand of gasoline before consid- ering service for the vehicle. Over 40 auto manufacturer’s world wide have issued and endorsed consistent gasoline specifications (the World- wide Fuel Charter, WWFC) to define fuel properties necessary to deliver enhanced emissions, performance, and durability for your vehicle. The manufacturer recom- mends the use of gasoline that meets the WWFC speci- fications if they are available. Reformulated Gasoline Many areas of the country require the use of cleaner burning gasoline referred to as Reformulated Gasoline. Reformulated gasoline contains oxygenates, and is spe- cifically blended to reduce vehicle emissions and im- prove air quality. The manufacturer strongly supports the use of reformu- lated gasoline. Properly blended reformulated gasoline will provide excellent performance and durability for the engine and fuel system components. Gasoline/Oxygenate Blends Some fuel suppliers blend unleaded gasoline with oxy- genates such as 10% ethanol, MTBE, and ETBE. Oxygen- ates are required in some areas of the country during the winter months to reduce carbon monoxide emissions. Fuels blended with these oxygenates may be used in your vehicle. CAUTION! DO NOT use gasoline containing METHANOL. Gasoline containing methanol may damage critical fuel system components. MMT In Gasoline MMT is a manganese containing metallic additive that is blended into some gasoline to increase octane. Gasoline blended with MMT provides no performance advantage beyond gasoline of the same octane number without MMT. Gasoline blended with MMT reduces spark plug life and reduces emission system performance in some vehicles. The manufacturer recommends that gasoline without MMT be used in your vehicle. The MMT content of gasoline may not be indicated on the gasoline pump, therefore, you should ask your gasoline retailer whether or not his/her gasoline contains MMT. It is even more important to look for gasoline without MMT in Canada because MMT can be used at levels higher than allowed in the United States. MMT is pro- hibited in Federal and California reformulated gasoline. STARTING AND OPERATING 223 Sulfur In Gasoline If you live in the northeast United States, your vehicle may have been designed to meet California low emission standards with clean burning, low sulfur, California gasoline. Gasoline sold outside of California is permitted to have higher sulfur levels which may affect the perfor- mance of the vehicle’s catalytic converter. This may cause the “Malfunction Indicator Light” to illuminate. Illumination of this light while operating on high sulfur gasoline does not necessarily mean your emission control system is malfunctioning. The manufacturer recom- mends that you try a different brand of unleaded gaso- line having lower sulfur to determine if the problem is fuel related prior to returning your vehicle to an autho- rized dealer for service. 224 STARTING AND OPERATING CAUTION! If the “Malfunction Indicator Light” is flashing, immediate service is required. See “Onboard Diag- nostic System” in Section 7 of this manual. Materials Added To Fuel All gasoline sold in the United States is required to contain effective detergent additives. Use of additional detergents or other additives is not needed under normal conditions. FUEL TANK FILLER CAP (GAS CAP) WARNING! To avoid fuel spillage and overfilling, do not “top off” the fuel tank after filling. The gas cap is located behind the fuel filler door, on the left side of the vehicle. If the gas cap is lost or damaged, be sure the replacement cap has been designed for use with this vehicle. When the gas cap is removed for refueling, it can be placed in the fuel filler door while filling the fuel tank. CAUTION! Damage to the fuel system or emission control system could result from using an improper fuel tank filler cap (gas cap). A poorly fitting cap could let impurities into the fuel system. STARTING AND OPERATING 225 WARNING! from the filler neck which may cause injury. † Remove the fuel cap slowly to prevent fuel spray † The volatility of some gasoline may cause a buildup of pressure in the fuel tank which may increase while you drive. This pressure can result in a spray of gasoline and/or vapors when the cap is removed from a hot vehicle. Removing the cap slowly allows the pressure to vent and prevents fuel spray. † Never add fuel when the engine is running. † Never have any smoking materials lit in or near the vehicle when the fuel cap is removed or the tank filled. 226 STARTING AND OPERATING TRAILER TOWING In this section you will find information on limits to the type of towing you can reasonably do with your vehicle. And you will find safety tips. Before towing a trailer carefully review this information to tow your load as efficiently and safely as possible. The factory-installed Class III and Class IV Trailer Tow Packages include a frame mounted receptacle and the above required equipment. They also include some nec- essary provisions for connecting an aftermarket electric brake controller. It is a light blue wire, identified with a tag, located under the instrument panel behind the brake pedal. Other equipment, such as trailer sway controls and braking equipment, trailer equalizing (leveling) equipment and low profile mirrors, may also be required or strongly recommended. To maintain warranty coverage, follow the requirements and recommendations in this manual concerning ve- hicles used for trailer towing. Perform maintenance services as prescribed in the appro- priate “Maintenance Schedule.” Refer to Section 8 of this manual. When your vehicle is used for trailer towing, never exceed the gross axle weight rating (GAWR) by the addition of: † The tongue weight of the trailer. † The weight of any other type of cargo or equipment put in or on your vehicle. WARNING! Improper towing can lead to an injury accident. Follow these guidelines to make your trailer towing as safe as possible: † Be sure a trailer is loaded heavier in front, about 10% to 15% of gross trailer weight. Loads balanced over the wheels or heavier in the rear cause the trailer to sway severely side to side which will cause loss of control of the vehicle and trailer. Failure to load trailers heavier in front is the cause of many trailer related accidents. † Do not interconnect the hydraulic brake system of your vehicle with that of the trailer. This could cause inadequate braking and possible personal injury. STARTING AND OPERATING 227 2,000 lbs (907 kg). † Trailer brakes are required for trailers in excess of † Do not connect a trailer lighting system directly to the lighting system of your vehicle. Use an approved trailer wiring harness. Failure to do so could damage the vehicle electrical system and/or result in personal injury. † When hauling cargo or towing a trailer, do not over- load your vehicle or trailer. Overloading can cause a loss of control, poor performance or damage to brakes, axle, engine, transmission, steering, suspension, body structure or tires. † Make certain that the load is secured in the trailer and will not shift during travel. Trailer and Tongue Weight Gross Trailer Weight (GTW) means the weight of the trailer plus the weight of all cargo, consumables and equipment loaded on the trailer when in actual underway towing condition. The best way to measure GTW is to put your fully loaded trailer on a vehicle scale. The entire weight of the trailer must be supported by the scale. 228 STARTING AND OPERATING † It is recommended that any hitches installed on your vehicle be factory installed, or installed by a dealer using factory approved parts. Factory approved parts are specifically engineered with your vehicle’s perfor- mance in mind, including the possibility that it will be involved in an accident. Other hitches may not have been so engineered. Vehicle performance, including vehicle damage in an accident situation, may therefore be different. † If trailer towing is required and your vehicle is not equipped with a trailer tow package, the Mopart accessory towing harnesses are the only approved method to provide for trailer lights. These harnesses are designed to provide current to the trailer lights but bypass the module designed to monitor tail lights. Refer to the package instructions for details. Always load a trailer with 60% of the cargo weight in the front of the trailer. This places approximately 10% to 15% of the GTW on the tow hitch of your vehicle. This portion of the GTW becomes the tongue weight. Trailer sway control and equalizing hitch are required for tongue weights above 350 lbs (159 kg)., trailer weights heavier than 3,500 lbs (1 587 kg). Cooling System Tips—Trailer Towing To reduce potential for engine and transmission over- heating in high ambient conditions, take the following actions: † City Traffic When stopped, put transmission in N (Neutral) and increase engine idle speed. i.e., STARTING AND OPERATING 229 † Highway Driving Reduce speed. † Air Conditioning Turn off temporarily. To reduce the potential for transmission overheating, turn the “Overdrive” off when pulling any trailer or shift the transmission to Drive position 2 on more severe grades. Move the shift lever to the next lower position to eliminate excessive transmission shifting. This action will also reduce the possibility of transmission overheating and provide better engine braking. 230 STARTING AND OPERATING Minimum Vehicle Requirements for Trailer Towing If you tow a trailer frequently, especially in hilly NOTE: country or when the outdoor temperature is high, we recommend that you change the transmission fluid at 30,000 mile (48 000 km) intervals. CAUTION! When pulling a heavy load or driving a fully loaded vehicle use a premium unleaded fuel to help prevent spark knock. If spark knock persists, lighten the load. Otherwise, engine piston damage may result. Other restrictions apply concerning trailer type, trailer frontal area and tongue weight. Carefully review the “Minimum Vehicle Requirements” chart in this section before towing a trailer. STARTING AND OPERATING 231 RECREATIONAL TOWING (BEHIND MOTORHOME, ETC.) CAUTION! Internal damage to the transfer case will occur if a front or rear wheel lift is used when recreational towing. NOTE: The transfer case must be in the N (Neutral) position, and the transmission must be in the P (Park) position for recreational towing. (Recreational towing is not available on Quadra-Trac I equipped vehicles.) 232 STARTING AND OPERATING Shifting Into Neutral (N) Use the following procedure to prepare your vehicle for recreational towing. CAUTION! It is necessary to follow these steps to be certain that the transfer case is fully in N (Neutral) before recreational towing to prevent damage to internal parts. 1. Depress brake pedal. 2. Shift transmission into N (Neutral). 3. Shift transfer case lever into N (Neutral). 4. Start engine. 5. Shift transmission into D (Drive). 6. Release brake pedal and ensure that there is no vehicle movement. 7. Shut the engine OFF and place the ignition key into the unlocked OFF position. 8. Shift transmission into P (Park). 9. Apply parking brake. 10. Attach vehicle to the tow vehicle with tow bar. 11. Release parking brake. CAUTION! Transmission damage may occur if the transmission is shifted into P (Park) with the transfer case in N (Neutral) and the engine running. With the transfer case in N (Neutral) ensure that the engine is OFF prior to shifting the transmission into P (Park) (refer to steps 7 – 8 above). Shifting Out Of Neutral (N) Use the following procedure to prepare your vehicle for normal usage. 1. Shift transmission into N (Neutral). 2. Shift transfer case lever to desired position. 3. Shift transmission into D (Drive). STARTING AND OPERATING 233 NOTE: When shifting out of transfer case N (Neutral), turning the engine OFF may be required to avoid gear clash. WARNING! You or others could be injured if you leave the vehicle unattended with the transfer case in the N (Neutral) position without first fully engaging the parking brake. The transfer case N (Neutral) position disengages both the front and rear driveshafts from the powertrain and will allow the vehicle to move regardless of the transmission position. The parking brake should always be applied when the driver is not in the vehicle. WARNING! Do not add a snow plow, winches, or any other aftermarket equipment to the front of your vehicle. This could adversely affect the functioning of the airbag system and you could be injured. 234 STARTING AND OPERATING CAUTION! † Do not use a bumper mounted clamp-on tow bar on your vehicle. The bumper face bar will be damaged. † Do not disconnect the rear driveshaft because fluid will leak from the transfer case and damage internal parts. SNOW PLOW Snow plows, winches, and other aftermarket equipment should not be added to the front end of your vehicle. The airbag crash sensors may be affected by the change in the front end structure. The airbags could deploy unexpect- edly or could fail to deploy during a collision. WHAT TO DO IN EMERGENCIES CONTENTS m Hazard Warning Flashers . . . . . . . . . . . . . . . . . 236 m If Your Engine Overheats . . . . . . . . . . . . . . . . . 237 m Changing A Flat Tire . . . . . . . . . . . . . . . . . . . . 238 N Jack And Lug Wrench Locations . . . . . . . . . . . 238 N Spare Tire Location . . . . . . . . . . . . . . . . . . . . 239 N Tire Changing Procedure . . . . . . . . . . . . . . . . 242 m Jump Starting Procedure . . . . . . . . . . . . . . . . . . 246 m Emergency Tow Hooks — If Equipped . . . . . . . . 248 m Towing A Disabled Vehicle . . . . . . . . . . . . . . . . 248 6 236 WHAT TO DO IN EMERGENCIES HAZARD WARNING FLASHERS Your vehicle’s hazard warning flasher is an emergency warning system. When you activate it, all front and rear directional signals will flash intermittently. Use it when your vehicle is disabled on or near the road. It warns other drivers to steer clear of you and your vehicle. This is an emergency warning system, not to be used when the vehicle is in motion. To activate the warning flasher, push down on the button on top of the steering column until it latches. To turn the warning flasher off, push down again to unlatch the button. NOTE: With extended use, the flasher may run down your battery. IF YOUR ENGINE OVERHEATS In any of the following situations, you can reduce the potential for overheating by taking the appropriate ac- tion. † On the highways — Slow down. † In city traffic — While stopped, put transmission in N (Neutral), but do not increase engine idle speed. NOTE: There are steps that you can take to slow down an impending overheat condition. If your air conditioner is on, turn it off. The air conditioning system adds heat to the engine cooling system and turning off the A/C removes this heat. You can also turn the Temperature Control to maximum heat, the Mode Control to floor, and the Fan Control to High. This allows the heater core to act as a supplement to the radiator and aids in removing heat from the engine cooling system. WHAT TO DO IN EMERGENCIES 237 CAUTION! Driving with a hot cooling system could damage your vehicle. If the temperature gauge reads “H”, pull over and stop the vehicle. Idle the vehicle with the air conditioner turned off until the pointer drops back into the normal range. If the pointer remains on the “H”, and you hear continuous chimes, turn the engine off immediately, and call for service. 238 WHAT TO DO IN EMERGENCIES CHANGING A FLAT TIRE Jack And Lug Wrench Locations The three piece tool set, consisting of two snap-together extensions that operate the jack and a wheel wrench that also is used as a crank for the jack, is stored under the right rear seat. The scissor-type jack is located under the left rear seat. To remove the jack from its stowage position, turn the wing nut counterclockwise to loosen the jack assembly, and then remove it. WARNING! † Always store the jack, lug wrench and spare, flat or damaged tire securely in the proper place. Never leave them loose in the vehicle where they could become dangerous projectiles during a quick stop or collision. † The jack is designed to use as a tool for changing tires only. The jack should not be used to lift the vehicle for service purposes, unless suitable sup- ports are placed under the vehicle as a safety measure, The vehicle should be jacked on a firm level surface only. Avoid ice or slippery areas. WHAT TO DO IN EMERGENCIES 239 Spare Tire Location To Remove the Spare Tire 1. Open the liftgate. 2. Grasp the cover on both sides at the edge adjacent to the carpet depressions and lift the cover to unlatch. The cover may be placed forward to lean against the rear 240 WHAT TO DO IN EMERGENCIES seatback or completely removed from the vehicle. It can also be kneeled down upon and used as ground cover to prevent clothing from getting soiled. 3. Remove the nut and tire. To Replace the Spare Tire 1. Place the tire into the rear compartment with the wheel facing upward: a. Replace the hold-down nut. b. Reinstall the cover by inserting the hinges through the carpet into the brackets at about a 30 degree angle and lower into position. Press down to lock the cover in position. 2. Your vehicle is equipped with either a temporary-use spare tire or a conventional spare tire. Maintain the temporary-use spare tire pressure at 60 psi (420 kPa), and the conventional spare at 33 psi (228 kPa). WARNING! Temporary-use spare tires are for emergency use only. With these tires, do not drive more than 50 miles (80 km) or exceed 50 mph (80 km/h). Temporary-use spare tires have a total tread life of 3,000 miles (4 800 km). Be sure to follow the warn- ings which apply to your spare. Failure to do so could result in spare tire failure and loss of vehicle control. Compact Spare Tire † Your vehicle is equipped with either a temporary-use spare tire or a conventional spare tire. Maintain the temporary-use spare tire pressure at 60 psi (420 kPa), and the conventional spare at 33 psi (228 kPa). WHAT TO DO IN EMERGENCIES 241 † Temporary use spare tires are for emergency use only, and are not intended for driving more than 50 miles (80 km) or exceeding 50 mph (80 km/h). † Never drive your vehicle with more than one compact † If your vehicle is equipped with Selec-Trac, avoid using four-wheel drive when a compact spare is installed. You should use 2WD only unless 4WD is necessary. 4 FULL TIME should be used if 4WD is required. spare installed at any time. 242 WHAT TO DO IN EMERGENCIES Tire Changing Procedure Preparation WARNING! You can be injured or killed if you try to change a wheel too close to moving traffic. Pull far enough off the road to avoid being hit when operating the jack or changing the wheel. † Park on a firm, level surface well off the road to provide ample work space. Put the transmission in P (Park) and stop the engine. Set the parking brake firmly and activate the hazard warning flasher. Avoid jacking up the vehicle with occupants inside. If the jack should fall, someone in the vehicle could be hurt. † Block the front and rear of the diagonally opposite tire. For example, if the right front tire is being changed, block the left rear wheel. Instructions 1. Remove the spare tire from under the cargo floor, jack and jack tools from under the left and right rear seat. 2. Loosen the lug nuts one-half turn counterclockwise. 3. Assemble the jack and jacking tools as shown. Connect jack handle driver (A) to extension (B), then to the lug wrench (C). WHAT TO DO IN EMERGENCIES 243 4. Locate the jack as shown. For the front axle, place it under the axle near the wheel to be changed. For the rear axle, place it under the axle as shown. Front Jacking Location 244 WHAT TO DO IN EMERGENCIES Rear Jacking Location 5. Raise the vehicle by turning the jack handle clockwise until the tire clears the ground. WARNING! Raising the vehicle higher than necessary can make the vehicle less stable and cause an accident. It could slip off the jack and hurt someone near it. Raise the vehicle only enough to remove the tire. 6. Remove the lug nuts and wheel. 7. Position the spare wheel/tire on the vehicle and install the lug nuts with the cone-shaped end toward the wheel. Lightly tighten the nuts until they are equally snug, using a crisscross pattern. To avoid the risk of forcing the vehicle off the jack, do not tighten the nuts fully until the vehicle has been lowered. 8. Lower the vehicle and remove the jack and wheel blocks. 9. Tighten the lug nuts securely in a crisscross pattern. Have an authorized service technician check that the torque is 85-115 ft.lbs. (115-156 N·m) as soon as possible. 10. Secure the jack, lug wrench, jack handle and tire in the proper locations. WHAT TO DO IN EMERGENCIES 245 WARNING! † A loose tire or jack thrown forward in a collision or hard stop could injure someone in the vehicle. Always stow the jack parts and the extra tire and wheel in the places provided. † Carefully follow these tire changing warnings to help prevent personal injury or damage to your vehicle: † Always park on a firm, level surface as far from the edge of the roadway as possible before raising the vehicle. † Block the wheel diagonally opposite the wheel to be † Apply the parking brake firmly before jacking. † Never start the engine with the vehicle on a jack. raised. 246 WHAT TO DO IN EMERGENCIES † Do not let anyone sit in the vehicle when it is on a jack. † Do not get under the vehicle when it is on a jack. † Only use the jack in the positions indicated. † If working on or near a roadway, be extremely careful of motor traffic. JUMP STARTING PROCEDURE NOTE: Check the charge indicator on top of the battery. If the indicator is light or yellow, replace the battery. 1. Wear eye protection and remove any metal jewelry such as watch bands or bracelets that might make an unintended electrical contact. 2. When boost is provided by a battery in another vehicle, park that vehicle within booster cable reach but without letting the vehicles touch. Set the parking brake, place the transmission in P (Park), and turn the ignition to OFF for both vehicles. 3. Turn off the heater, radio and all unnecessary electrical loads. 4. Connect one end of a jumper cable to the positive terminal of the discharged battery. Connect the other end of the same cable to the positive terminal of the booster battery. 5. Connect the other cable, first to the negative terminal of the booster battery and then connect the other end to a non-paint metal surface on the engine of the vehicle with the discharged battery. Make sure you have a good contact on the engine. 6. Start the engine in the vehicle which has the booster battery, let the engine idle a few minutes, then start the engine in the vehicle with the discharged battery. 7. When removing the jumper cables, reverse the above sequence exactly. Be careful of the moving belts and fan. WHAT TO DO IN EMERGENCIES 247 † Do not use a booster battery or any other booster source that has a greater than 12–volt system, i.e., do not use a 24–volt power source. † Never attempt to jump start a discharged battery that is frozen, because it could rupture or explode during jump starting. † Be sure your vehicle is not touching the jump start † Observe all Battery Warnings in Section 7 of this vehicle. manual, while jump starting your vehicle. NOTE: To start the vehicle following connection of a booster battery, the Security Alarm System must first be disabled by cycling a front door key cylinder or by using the keyless entry transmitter. WARNING! Jump starting can be dangerous. To avoid personal injury or damage to electrical components in vehicle, observe the following warnings: † Battery fluid is a corrosive acid solution and can burn or even blind you. Don’t allow battery fluid to contact your eyes, skin, or clothing. Don’t lean over a battery when attaching clamps. If acid splashes in eyes or on skin, flush the area immediately with large amounts of water. 248 WHAT TO DO IN EMERGENCIES WARNING! WARNING! Do not attempt to push or tow your vehicle to get it started. Unburned fuel could enter the catalytic converter and, once the engine has started, ignite and damage the converter and vehicle. Stand clear of vehicles when pulling with tow hooks. Tow straps and chains may break, causing serious injury. TOWING A DISABLED VEHICLE The manufacturer recommends towing with all four wheels off the ground. Acceptable methods are to tow the vehicle on a flatbed or with one end of the vehicle raised and the other end on a towing dolly. EMERGENCY TOW HOOKS — IF EQUIPPED If your vehicle is equipped with tow hooks, they will be mounted in the front of the vehicle. CAUTION! Tow hooks are for emergency use only, to rescue a vehicle stranded off road. Do not use tow hooks for tow truck hookup or highway towing. You could damage your vehicle. MAINTAINING YOUR VEHICLE CONTENTS m 4.0L Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 m 4.7L/4.7 HO Engine . . . . . . . . . . . . . . . . . . . . . 252 m Onboard Diagnostic System — OBD II . . . . . . . . 253 m Emissions Inspection And Maintenance Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254 m Replacement Parts . . . . . . . . . . . . . . . . . . . . . . 255 m Dealer Service . . . . . . . . . . . . . . . . . . . . . . . . . 255 m Maintenance Procedures . . . . . . . . . . . . . . . . . . 256 . . . . . . . . . . . . . . . . . . . . . . . . . . 256 N Engine Oil N Drive Belts - Check Condition And Tension . . . 261 N Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . 261 N Catalytic Converter . . . . . . . . . . . . . . . . . . . . 261 N Crankcase Emission Control System . . . . . . . . 263 N Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 263 N Air Cleaner Filter . . . . . . . . . . . . . . . . . . . . . 264 N Maintenance-Free Battery . . . . . . . . . . . . . . . . 264 N Air Conditioner Maintenance . . . . . . . . . . . . . 265 N Power Steering Fluid Check . . . . . . . . . . . . . . 266 250 MAINTAINING YOUR VEHICLE N Driveline And Steering Component Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . 267 N Body Lubrication . . . . . . . . . . . . . . . . . . . . . 267 N Windshield Wiper Blades . . . . . . . . . . . . . . . . 268 N Windshield Washers — Front And Rear . . . . . 268 N Exhaust System . . . . . . . . . . . . . . . . . . . . . . 269 N Cooling System . . . . . . . . . . . . . . . . . . . . . . . 269 N Hoses And Vacuum/Vapor Harnesses . . . . . . . 274 N Brake System . . . . . . . . . . . . . . . . . . . . . . . . 274 N Automatic Transmission . . . . . . . . . . . . . . . . 277 N Transfer Case . . . . . . . . . . . . . . . . . . . . . . . . 280 N Front/Rear Axle Fluid . . . . . . . . . . . . . . . . . . 281 N Appearance Care And Protection From m Fuse Panel Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 N Interior Fuses . . . . . . . . . . . . . . . . . . . . . . . . 286 N Underhood Fuses (Power Distribution Center) . . . . . . . . . . . . . . 288 m Vehicle Storage . . . . . . . . . . . . . . . . . . . . . . . . 289 m Replacement Bulbs . . . . . . . . . . . . . . . . . . . . . . 289 m Fluid Capacities . . . . . . . . . . . . . . . . . . . . . . . . 291 m Recommended Fluids, Lubricants And Genuine Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292 N Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292 N Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293 4.0L ENGINE MAINTAINING YOUR VEHICLE 251 252 MAINTAINING YOUR VEHICLE 4.7L/4.7 HO ENGINE ONBOARD DIAGNOSTIC SYSTEM — OBD II Your vehicle is equipped with a sophisticated onboard diagnostic system called OBD II. This system monitors the performance of the emissions, engine, and automatic transmission control systems. When these systems are operating properly, your vehicle will provide excellent performance and fuel economy, as well as engine emis- sions well within current government regulations. If any of these systems require service, the OBD II system will turn on the “Malfunction Indicator Light.” It will also store diagnostic codes and other information to assist your service technician in making repairs. Al- though your vehicle will usually be drivable and not need towing, see your dealer for service as soon as possible. MAINTAINING YOUR VEHICLE 253 CAUTION! † Prolonged driving with the “Malfunction Indica- tor Light” on could cause further damage to the emission control system. It could also affect fuel economy and driveability. The vehicle must be serviced before any emissions tests can be per- formed. † If the “Malfunction Indicator Light” is flashing while the engine is running, severe catalytic con- verter damage and power loss will soon occur. Immediate service is required. 254 MAINTAINING YOUR VEHICLE EMISSIONS INSPECTION AND MAINTENANCE PROGRAMS In some localities, it may be a legal requirement to pass an inspection of your vehicle’s emissions control system. Failure to pass could prevent vehicle registration. For states which have an I/M (Inspection and Maintenance) requirement, this check verifies the following: the MIL (Malfunction Indicator Lamp) is functioning and is not on when the engine is running, and that the OBD (On Board Diagnostic) system is ready for testing. Normally, the OBD system will be ready. The OBD system may not be ready if your vehicle was recently serviced, if you recently had a dead battery, or a battery replacement. If the OBD system should be determined not ready for the I/M test, your vehicle may fail the test. Your vehicle has a simple ignition key actuated test which you can use prior to going to the test station. To check if your vehicle’s OBD system is ready, you must do the following: 1. Insert your ignition key into the ignition switch. 2. Turn the ignition to the ON position, but do not crank or start the engine. 3. If you crank or start the engine, you will have to start this test over. 4. As soon as you turn your key to the ON position, you will see your MIL symbol come on as part of a normal bulb check. 5. Approximately 15 seconds later, one of two things will happen: a. The MIL will flash for about 10 seconds and then return to being fully illuminated until you turn off the ignition key or start the engine. This means that your vehicle’s OBD system is not ready and you should not proceed to the I/M station. b. The MIL will not flash at all and will remain fully illuminated until you turn off the ignition key or start the engine. This means that your vehicle’s OBD system is ready and you can proceed to the I/M station. If your OBD system is not ready, you should see your authorized dealer or repair facility. If your vehicle was recently serviced or had a battery failure or replacement, you may need to do nothing more than drive your vehicle as you normally would in order for your OBD system to update. A recheck with the above test routine may then indicate that the system is now ready. Regardless of whether your vehicle’s OBD system is ready or not ready, if the MIL symbol is illuminated during normal vehicle operation, you should have your MAINTAINING YOUR VEHICLE 255 vehicle serviced before going to the I/M station. The I/M station can fail your vehicle because the MIL symbol is on with the engine running. REPLACEMENT PARTS Use of genuine Mopart parts for normal/scheduled maintenance and repairs is highly recommended to in- sure the designed performance. Damage or failures caused by the use of non-Mopart parts for maintenance and repairs will not be covered by the manufacturer’s warranty. DEALER SERVICE Your dealer has the qualified service personnel, special tools and equipment to perform all service operations in an expert manner. Service Manuals are available which include detailed service information for your vehicle. Refer to these manuals before attempting any procedure yourself. 256 MAINTAINING YOUR VEHICLE NOTE: systems can result against you. Intentional tampering with emissions control in civil penalties being assessed WARNING! You can be badly injured working on or around a motor vehicle. Do only that service work for which you have the knowledge and the proper equipment. If you have any doubt about your ability to perform a service job, take your vehicle to a competent mechanic. MAINTENANCE PROCEDURES The pages that follow contain the required maintenance services determined by the engineers who designed your vehicle. Besides the maintenance items for which there are fixed maintenance intervals, there are other items that should operate satisfactorily without periodic maintenance. However, if a malfunction of these items does occur, it could adversely affect the engine or vehicle performance. These items should be inspected if a malfunction is observed or suspected. Engine Oil Checking Oil Level To assure proper engine lubrication, the engine oil must be maintained at the correct level. Check the oil level at regular intervals, such as every fuel stop. The best time to check the engine oil level is about 5 minutes after a fully warmed engine is shut off or before starting the engine after it has sat overnight. MAINTAINING YOUR VEHICLE 257 4.0L Engines 4.7L Engines Checking the oil while the vehicle is on level ground will improve the accuracy of the oil level readings. Maintain the oil level between the MIN and MAX or ADD and SAFE markings on the dipstick. Adding 1 U.S. Quart (0.95L) of oil when the reading is at the MIN mark will result in a MAX reading on these engines. 258 MAINTAINING YOUR VEHICLE CAUTION! Overfilling or underfilling the crankcase will cause aeration or loss of oil pressure. This could damage your engine. Change Engine Oil Road conditions as well as your kind of driving affect the interval at which your oil should be changed. Check the following to determine if any apply to you: † Day or night temperatures are below 32°F (0°C) † Stop and go driving † Extensive engine idling † Driving in dusty conditions † Short trips of less than 10 miles (16.2 km) speeds during hot weather, above 90°F (32°C) † More than 50% of your driving is at sustained high † Trailer towing † Taxi, Police, or delivery service (Commercial Service) † Off road or desert operation † If equipped for and operating with E-85 (ethanol) fuel If ANY of these apply to you, then change your engine oil every 3,000 miles (5 000 km) or 3 months, whichever comes first, and follow the maintenance recommenda- tions in “Maintenance Schedule B.” If none of these apply to you, then change your engine oil every 6,000 miles (10 000 km) or 6 months, whichever comes first. NOTE: Under no circumstances should oil change in- tervals exceed 6,000 miles (10 000 km) or 6 months whichever comes first. Engine Oil Selection For best performance and maximum protection for all engines under all types of operating conditions, the manufacturer recommends engine oils that are API Cer- tified and meet the requirements of DaimlerChrysler Material Standard MS-6395. American Petroleum Institute (API) Engine Oil Identification Symbol This symbol means that the oil has been certified by the American Petroleum Institute (API). The manufacturer only recommends API Certified engine oils. MAINTAINING YOUR VEHICLE 259 Engine Oil Viscosity Chart The proper SAE viscosity grade of engine oil should be selected based on the following recommendation and be within the operating temperature shown in the engine oil viscosity chart. 4.0L Engines 260 MAINTAINING YOUR VEHICLE 4.7L/4.7L HO Engines Materials Added to Engine Oils The manufacturer strongly recommends against the ad- dition of any additives (other than leak detection dyes) to engine oil. Engine oil is an engineered product and it’s performance may be impaired by supplemental addi- tives. Disposing of Used Engine Oil Care should be taken in disposing of the used engine oil from your vehicle. Used oil, indiscriminately discarded, can present a problem to the environment. Contact your local authorized dealer, service station, or governmental agency for advice on how and where used oil can be safely discarded in your area. Engine Oil Filter The engine oil filter should be replaced with a new filter at every oil change. Engine Oil Filter Selection All of the manufacturer’s engines have a full-flow type disposable oil filter. Use a filter of this type for replace- ment. The quality of replacement filters varies consider- ably. Only high quality filters should be used to assure most efficient service. Mopart engine oil filters are high quality oil filters and are recommended. Drive Belts - Check Condition and Tension At the mileages shown in the appropriate “Maintenance Schedule,” check all drive belts for condition and proper tension. Improper belt tension can cause belt slippage and failure. Inspect the drive belt for evidence of cuts, cracks, or glazing and replace them if there is any sign of damage which could result in belt failure. If adjustment is re- quired, adjust the belts according to the specifications and procedures shown in the Service Manual. Special tools are required to properly measure tension and to restore belt tension to factory specifications. Also, check belt routing to make sure there is no interference between the belts and other engine components. MAINTAINING YOUR VEHICLE 261 Spark Plugs Spark plugs must fire properly to assure engine perfor- mance and emission control. New spark plugs should be installed at the specified mileage. The entire set should be replaced if there is any malfunction due to a faulty spark plug. Refer to the “Vehicle Emission Control Informa- tion” label in the engine compartment for spark plug information. Catalytic Converter

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2004 Jeep Grand Cherokee Owners Manual