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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 253 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0231 To DTC P0690) >> DTC P0351-P0358 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Perform the Circuit/System Verification first.
  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
  3. Turn OFF the ignition.
  4. Disconnect the ECM C2 harness connector.
    5. IMPORTANT: A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.
  5. Disconnect the affected ignition/coil module harness connector.
  6. Test the affected IC circuit for the fault condition identified in the Circuit/System Verification.
    • If a condition is detected, repair the circuit, as required.
  7. Connect the ECM C2 harness connector.
  8. Exchange the affected ignition coil/module with the ignition coil/module of a cylinder that is not affected.
  9. Start and run the engine. With a scan tool, monitor the IC circuit parameters.
    • If the circuit status fault identified in the Circuit/System Verification transfers with the ignition coil/module, replace the ignition coil/module assembly.
    • If the circuit status fault identified in the Circuit/System Verification does not transfer with the ignition coil/module, replace the ECM.
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