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Diagnostic Aids

Solenoid coil resistance must measure more than 20 ohms. A lower resistance value will cause early failure to the ECM driver 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.

Fig 1: TCC Troubleshooting Chart (Diesel ECS)
G92A13730Courtesy of GENERAL MOTORS CORP.
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