ECU Codes

[puckish]

MattyB are these the codes you are referring to?

If not drop me a line and I'll get the other stuff for ya.

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ECU diagnostics

Usually you have to remove the computer from the mounts in the footwell, as the LED(s) you need to see is pointing away from you.

Switch on the ignition, but don't start. The LED on the ECU will be glowing.

Turn the selector screw clockwise all the way (gently!)

For two LED EDU's: 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 ECU's: wait a couple of seconds, and turn the screw back counter-clockwise, the ECu is now in mode 2.

Note - 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 = first digit, green = second digit, eg red 2x flash, green 1x flash = code 21) The ECU's on most R32's have one LED, long flash = first digit, short flash = second digit, eg long, long, short = code 21.

Codes:

11 Crankshaft position sensor

12 MAF sensor circuit

13 Coolent temperature circuit

14 Vehicle speed sensor circuit

21 Ignition circuit

31 ECU (ouch!)

34 Knock sensor

43 Throttle position circuit

45 Injector leak

51 Ignition circuit

54 Auto signal to ECU

55 All OK

There are some other codes, not verified for the auto. These are three digit codes, so I'm not sure how they would be flashed.

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

There is also a 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

Go by the trend shown, eg mostly on = lean, mostly off = rich. The LED should be flashing between 5-10 times per 10 seconds under normal conditions.

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Auto Transmission Diagnostics

Enter the auto transmission diagnostics mode

Have the car at normal temperature in Park with the overdrive on

Start the engine _ the power light will go out after 2 seconds

Turn the ignition off Move the selector to Drive (you may have to use the push button release)

Overdrive off Wait 2 seconds, and turn the ignition on

Wait 2 seconds and move the selector to 2 Overdrive on Move the selector to 1

Overdrive Off

Press the accelerator fully and release

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Auto transmission diagnostics codes.

All codes are flashed with the Power Light on the dashboard (R32) and on the auto mode selection button on the R33's.

The sequence starts with one long flash.

If everything is OK, this will be followed by ten short flashes. Errors are indicated by a long flash in the sequence of short flashes.

1st flash longer Revolution sensor shorted or disconnected

2nd flash longer Speed sensor shorted or disconnected

3rd flash longer Throttle sensor shorted or disconnected

4th flash longer Shift solenoid A shorted or disconnected

5th flash longer Shift solenoid B shorted or disconnected

6th flash longer Overrun clutch solenoid shorted or disconnected

7th flash longer Lockup solenoid shorted or disconnected

8th flash longer Fluid temperature sensor is disconnected or the control unit power source is damaged

9th flash longer Engine revolution sensor shorted or disconnected

10th flash longer Line pressure solenoid shorted or disconnected

All flashes the same with no long start flash Battery voltage low, has been recently disconnected or control unit has just been reconnected

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