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Home › Hummer › 2009 › H3 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 3.7L - DTC P0324 To DTC P0446 › DTC P0351-P0355 › Circuit/System Testing

Circuit/System Testing

  1. Turn OFF the ignition.
  2. Disconnect the ECM.
  3. Test the affected IC circuit terminal B for an open, a high resistance, a short to ground and for a short to voltage.
    • If a fault is found, repair the circuit as needed.
  4. Connect the ECM.
  5. Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
  6. Start the engine and observe the scan tool.
    • If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed.
    • If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.
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