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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 512 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0358) >> Diagnostic Information and Procedures >> DTC P0351-P0358 >> Circuit/System Testing

Circuit/System Testing

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  1. With the engine running, monitor the Cylinder 1-8 IC Ckt. Status parameters with a scan tool.
    • If a short to GND or Open status test displays FAULT, test for an open/high resistance or short to ground on the affected IC circuit terminal C.
    • If a short to volts status test displays FAULT, test for a short to voltage on the affected IC circuit terminal C.
    2. IMPORTANT:

    A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.

  2. Exchange the affected ignition coil/module with the ignition coil/module of a cylinder that is not affected.
  3. Start and run the engine. With a scan tool, monitor the IC circuit parameters and the Misfire Current counters.
    • If the circuit status fault identified or the misfire transfers with the ignition coil/module, replace the ignition coil/module assembly.
    • If the circuit status fault identified or the misfire does not transfer with the ignition coil/module, replace the ECM.
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