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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 248 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0010 To DTC P0230) >> DTC P0010 >> 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: You must 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. Ignition OFF, disconnect X112.
  4. Test for less than 3 ohms between the low reference circuit terminal 1 and ground on the ECM side of the harness.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Verify that a test lamp does not illuminate between the ground circuit terminal E and the control circuit D on the ECM side of the harness.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Remove the test lamp.
  7. Command the CMP actuator from 0-20 degrees. Verify the scan tool CMP actuator ckt short to volts test status parameter is OK.
    • If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  8. Install a 3A fused jumper wire between the control circuit terminal D and the low reference circuit terminal E on the ECM side of the harness. Command the CMP actuator to 20 degrees with a scan tool. Verify the scan tool CMP actuator ckt short to volts test status parameter is displaying Fault.
    • If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  9. Remove the water pump from the engine. Refer to Water Pump Removal .
  10. Inspect and test the remaining CMP solenoid wire harness from C112 to the CMP solenoid for a short to ground or an open/high resistance.
    • If all circuits test normal, replace the CMP actuator solenoid.
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