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Home >> GMC >> 1989 >> Magnavan 6.2 J, 400/M40 >> Repair and Diagnosis >> Engine Performance >> System >> 6.2L CEC Testing >> Diagnosis & Testing >> Cold Advance System Electrical Check >> Diagnostic Aids

Diagnostic Aids

If there is no electrical problem found, check the operation of the cold advance solenoid in injection pump. Check the solenoid coil resistance of all ECM controlled solenoids and relays, before installing replacement ECM. Replace any solenoid or relay that measures less than 20 ohms resistance.

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