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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1892 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.8L, 5.3L OR 6.0L - DTC P0010 TO DTC P0230)DTC P0010CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. 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, disconnect the CMP actuator solenoid harness connector, C112.
  2. Test for less than 1 ohm between the low reference circuit terminal E and ground on the ECM side of 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.
  3. Verify the test lamp does not illuminate between the ground circuit terminal E and the control circuit D on the ECM side of harness.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Remove the test lamp.
  5. Command the CMP actuator from zero to 25 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.
  6. Install a 3A fused jumper wire between the control circuit terminal D and the low reference circuit terminal E on the ECM side of harness. Command the CMP actuator to 25 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.
  7. Remove the water pump from the engine. Refer to Water Pump Removal (RPO LY2/LMF) or Water Pump Removal (RPO LY6) .
  8. 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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.