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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 252 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - DTC P0230 To DTC P0690) >> DTC P0351-P0358 >> Circuit/System Testing

Circuit/System Testing

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    IMPORTANT: Perform the Circuit/System Verification first.
  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 condition, before DTCs P0351-P0358 set.
  3. Disconnect the affected ignition/coil module harness connector.
  4. Test the affected IC circuit for the fault condition identified in Circuit/System Verification.
    • If a condition is detected, repair the circuit as required.
  5. Connect the ECM C2 harness connector.
  6. Exchange the affected ignition coil/module, with the ignition coil/module of a cylinder that is not affected.
  7. Start and run the engine. With a scan tool, monitor the IC circuit parameters.
    • If the circuit status fault identified in Circuit/System Verification transfers with the ignition coil/module, replace the ignition coil/module assembly.
    • If the circuit status fault identified in Circuit/System Verification does not transfer with the ignition coil/module, replace the ECM.
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