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Home >> GMC >> 2003 >> Sierra 2500 HD, 2D Pickup, 6.6 1, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 6.6L >> Computerized Engine Controls >> Engine Control Module & Fuel Injector Control Module >> Ground Circuits

Ground Circuits

Check ECM/FICM connectors for corroded or loose connections. Repair as necessary. Disconnect ECM/FICM connectors. Using a DVOM, measure resistance between negative battery terminal and ground terminals at ECM/FICM harness connector. If resistance is more than 5 ohms, repair open in affected ground circuit. If resistance is 5 ohms or less, ground circuits are okay.

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