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Circuit/System Testing

    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/LC9/LY5/LMG) or Water Pump Removal (RPO LY6/L76/L9H) .
  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.
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