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1985-1988 Nissan Common OBD-I Codes

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-Verify that diagnostic mode selector is turned fully counterclockwise. -Turn ignition switch ON. -Make sure inspection lamps stay on. (Bulb check.) -Ture diagnostic mode selector fully clockwise. -Make sure inspection lamps display code 23 and 31. -Depress accelerator pedal and release. -Make sure inspection lamps display code 31. -Start engine, apply brakes and shift into […]

1989-1994 Nissan Common OBD-I codes

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-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 […]