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Diagnostic Trouble Codes - 1991 Nissan
| 11 | Crankshaft Position Sensor |
| 12 | Air Flow Meter |
| 13 | Engine Coolant Temperature Sensor |
| 14 | Vehicle Speed Sensor |
| 21 | Ignition Signal |
| 22 | Fuel Pump |
| 31 | Engine Control Unit |
| 32 | EGR Function |
| 33 | Oxygen (O2) Sensor |
| 34 | Knock Sensor (Turbo Only) |
| 35 | EGR Temperature Sensor |
| 43 | Throttle Position Sensor |
| 45 | Injector Leak |
| 51 | Injector Circuit |
| 54 | A/T Control |
| 55 | No Faults In Memory |
- Access the ECU and position it for observing the diodes.
- If the engine does not run, turn the key on and proceed to step #4.
- Start the engine and warm it to operating temperature then idle.
- Turn the diagnostic mode selector on the ECU fully clockwise until both diodes flash 3 times then turn the selector fully counterclockwise. The ECCS system is now in mode 3.
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