General: 1985-1988 Nissan Common OBD-I Codes

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-Verify that diagnostic mode slesctor 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 "D" position. -Make sure inspection lamps display code 31. -Turn a load switch OFF-ON-OFF. (A/C switch, Headlight switch etc.) -Shift into "P". -Make sure inspection lamps display code 44. Any other code is a DTC.