Nissan Skyline R32 Gts-t Ecu Diagnostic Explained - ...  

Hey i dunno if anyone knows these but i looked everywhere to find these and had no luck.. so i thought id post em here

ECU Diagnostic Explained:

The ECU is in the passenger footwall, behind the plastic kick plate to
the left of your feet. You'll have to remove the computer from the
mounts in the footwall, as the led/leds you'll need to see are pointing
towards the front of the car. Switch on the ignition but don't start
engine, the led on the ECU will begin glowing turn the selector screw
clockwise all the way.

There are three types of factory ECU in Skylines. One type has two
LEDs and five modes, the other type has one LED and two modes
and the last type has no LEDs, the output is done with the engine
check light in the instrument cluster.

For two led ecus the led will flash once, pause, flash twice, pause...
all the way up to five this is the diagnostic mode Mode 1 = one flash,
mode 5 = five flashes. When you reach the right mode, turn the screw
back counter-clockwise. Mode 3 is what most people use.

For one led ecus wait a couple of seconds, and turn the screw back
counter-clockwise, the ECU is now in mode 2 the engine check light
on the dash will mirror the LED on the computer.

The led will flash out a code or series of codes if there is more than
one fault More recent ECU's have two LED's red is first digit, green is
second digit, e.g. red 2x flash, green 1x flash = code 21. The ecus on
most R32's have one LED, long flash = first digit, short flash = second
digit, e.g. long, long, short = code 21.
Codes:
11 Crankshaft position sensor
12 MAF sensor circuit
13 Coolant temperature circuit
14 Vehicle speed sensor circuit
21 Ignition circuit
31 ECU
34 Knock sensor
43 Throttle position circuit
45 Injector leak
51 Ignition circuit
54 Auto signal to ECU
55 All OK


Turn the ignition off to put the ECU back to normal.


There is also an O2 sensor test in real time available - do the above
to get the ECU into mode 2 (single LED ECU) or mode 1 (2 LED
ECU's) Start the engine. Warm the engine, and then run under no
load at 2000 rpm for the test. Single LEDs: on = lean, off = rich Dual
LED's: green LED on = lean, green LED off = rich

This post has been edited by ezekiel10: Feb 3 2007, 05:07 PM