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Engine Controls - System & Component Testing - 6.6L: Wiring GMC Sierra 1500 HD

Testing & Diagnostics 8 illustrations

ECM/FICM Harness Resistance

Turn ignition switch to LOCK position. Disconnect ECM/FICM and appropriate component harness connectors. Check for open or short circuits between appropriate ECM/FICM harness connector terminal and appropriate component harness connector terminal. If harness is open or shorted, repair as necessary.

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Scheme 76: ECM/FICM Harness Resistance
Scheme 76: ECM/FICM Harness Resistance

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