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Home >> Infiniti >> 1990 >> M30 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> Mode II
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Mode II

NOTE: Code 55 indicates that there is no malfunction and the system is OK.

This is self-diagnostic mode for retrieving fault or trouble code(s). See RETRIEVING CODES. With the engine running, Mode II can monitor air/fuel mixture feedback control. The CHECK ENGINE light and Red LED in the ECU will flash on (lean) and off (rich) more than 5 times every 10 seconds with engine speed at 2000 RPM when system is in closed loop. The CHECK ENGINE light and Red LED do not flash remain on or off if system is in open loop.

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