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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0335 To DTC P3449) >> DTC P0351-P0358 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn OFF the ignition.
  2. Disconnect the ECM C2 harness connector.
    3. IMPORTANT: A high resistance on any IC circuit can cause a misfire before the DTC sets.
  3. Test the affected IC circuit for the following:
    • Short to voltage
    • Short to ground
    • Open/high resistance
    • If a fault is found, repair the circuit as needed.
  4. Connect the ECM the C2 harness connector.
  5. Exchange the affected ignition coil/module, with the ignition coil/module of a cylinder that is not affected.
  6. Start the engine and observe the scan tool.
    • If the DTC or the misfire transfers with the suspect ignition coil/module, replace that ignition coil/module assembly.
    • If the DTC or the misfire does not transfer with the suspect ignition coil/module, replace the ECM.
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