Editing Z31/ECUcodes php (section)

=== 1988-1989 Model Diagnosis ===

-
Unhook the ECU from its bracket on the
'''left side of the passenger footwell'''(leave it plugged into the loom) and locate the mode selector (small screw on the ECU).

* Turn the ignition switch to the ON position. Turn the diagnostic mode selector fully clockwise until the LEDs flash, then back fully counterclockwise.
* When the ignition is turned OFF during diagnosis and turned back ON, the ECU will automatically return to
'''Mode I'''. - On California models, the Check Engine Light will illuminate in Mode I if the emission system malfunctions with the engine running.
'''Mode II'''diagnoses fuel and emission control system malfunctions using the self-diagnostic codes.-
To start the test: Warm the engine to normal temperature. Turn the selector fully clockwise, wait for 3 flashes, then turn it fully counterclockwise.
The ECU is now in
'''Mode III'''(trouble code mode).

==== Trouble Code Chart ====

| Trouble Code | Circuit or System | Possible Cause |
|---|---|---|
| Code 11 (1 red, 1 green) | Crank Angle Sensor | Faulty sensor or open/short circuit |
| Code 12 (1 red, 2 green) | Air Flow Meter | Source or ground circuit open/shorted |
| Code 13 (1 red, 3 green) | CHTS (Cylinder Head Temp Sensor) | Sensor or ground circuit open/shorted |
| Code 14 (1 red, 4 green) | Vehicle Speed Sensor | Open circuit |
| Code 21 (2 red, 1 green) | Ignition Signal | No ignition signal during cranking/running |
| Code 22 (2 red, 2 green) | Fuel Pump Circuit | Open or shorted circuit |
| Code 23 (2 red, 3 green) | Idle Switch Circuit | Open circuit |
| Code 31 (3 red, 1 green) | ECU Control Unit | Input signal out of range, replace ECU |
| Code 32* (3 red, 2 green) | EGR Function | EGR control valve not operating |
| Code 33 (3 red, 3 green) | Exhaust Gas Sensor | Sensor circuit open |
| Code 34 (3 red, 4 green) | Detonation Sensor (Turbo) | Sensor open or shorted |
| Code 35* (3 red, 5 green) | Exhaust Gas Temp Circuit | Circuit open or shorted |
| Code 42 (4 red, 2 green) | Fuel Temperature Sensor ** | Sensor open or shorted |
| Code 43* (4 red, 3 green) | Throttle Sensor | Sensor open or shorted |
| Code 45* (4 red, 5 green) | Injector Leak | Leaking injector(s), check and replace |
| Code 55 (5 red, 5 green) | No Malfunction | Normal Operation |

* * California Models Only
* ** Code 41 for 1987 models

[[Category:Imported from Xenonzcar]]