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Home >> Isuzu >> 1989 >> Impulse 2.3 L, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes >> Diagnostic Circuit Check >> Code 12 - System Normal
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Code 12 - System Normal

Code 12 is always displayed when the key is in the "ON" position and the engine is not running and ONLY means that the engine is not running. Code 12 is not stored in memory.

NOTE: If Code 12 is only displayed when the function key is operated after clearing the memory, it indicates that the ECM electrical circuits and self-diagnosis system are functioning properly.
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