Self Diagnostic Test For The Vl Computers - D.I.U. Test for the VL engine management  

OK I often read people having problems with VL's and especialy their engine management computer. It's no wonder as these are now getting on towards 20yrs old. So I thought I would make this post up for those that have VL's and have problems from time to time.

This test is for the VL n/a 3.0ltr engine and also the 3.0ltr turbo engine;

1.) Remove the screw retaining the front left side kick panel and remove the panel

2.) Turn the diagnostic mode selector carefully, located above the LED's fully anticlockwise. Do not force it or press hard.

3.) Turn the ingnition switch to the "ON" position and ensure the LED's remain lit.

4.) Carefully turn the diagnostic mode selector fully clockwise.

5.) Start the engine and allow it to idle. By starting the engine the starter signal circuit is activated and the red and green LED's may begin to flash.

To indentify the code numbers count the number of flashes of the red and green LED's. The red LED represents 10 and the green LED represents 1. For example if the red LED flashes once and then the green LED flashes once that would indicate code number 11, which is the crank angle sensor circuit. If more then one fault is present then it will diplay them in numerical order with a pause between each one.

The fault codes are the following;

11:- Crank Angle Circuit
12:- Air Flow Meter Circuit
13:- Coolant Temperature Sensor Circuit
14:- Vehicle Speed Sensor Circuit
21:- Ignition Signal Circuit
23:- Throttle Switch Circuit
24:- Neutral Switch Circuit
31:- Satifactory Operation (non air-con vehicles) OR Air-conditioner Circuit
32:- Starter Singnal Circuit
34:- Detonation Sensor Circuit (turbo models)
44:- Satisfactory Operation (air-con vehicles)

*****If the engine can not be started, operate the starter motor for at least 2 seconds. This will activate the starter signal circuit and cancel code number 32. NOW PROCEED TO OPERATION NUMBER 8. *****

6.) Drive the vehicle at a speed greater then 10km/hr. Now this will activate the speed sensor circuit and cancel code number 14.

7.) Stop the engine and turn the ignition switch to the "ON" position.

8.) Depress and release the throttle pedal. This will activate the throttle switch and cancel code number 23.

9.) Move the transmission shift lever from neutral to any other gear and back to neutral. This will activate the neutral switch circuit and cancel code number 24.

10.) On vehicles equipped with air-con turn the air-con switch from "OFF" to "ON" and then "OFF" again. This will activate the air-con switch circuit and cancel code 31.

11.) Note the code/s displayed on the control unit.
If code number 31 for vehicles not equiped with air-con , or code number 44 for vehicles is displayed this indicates the system is functioning correctly and no faults have been detected.
To complete the self diagnostic test turn the self diagnostic selector fully anticlockwise and turn the ignition to the "OFF" position.

12.) If the control unit displays codes other than numbers 31 for non air-con equipped cars or 44 for for air-con equipped cars then refer to the fault code table above as earlier mentioned. If there is more then one fault then the codes will be displayed in numerical order and there will be a gap in each series of flashes.

TO ERASE THE ENGINE MANAGEMENT COMPUTER MEMORY

1.) Turn the ignition switch to the "ON" position.
2.) Turn the diagnostic mode selector fully clockwise and leave for at least 5 seconds.
3.) Turn the diagnostic mode selector fully anticlockwise in that position for at least 5 seconds.
4.) Turn the ignition switch to the "OFF" position.


So there you go I hope that has helped some owners out that own VL's. They are a great vehicle but they are getting on in age and like anything electrical can have niggly problems as they get older.

Many thanks,
Rick
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