Circuit/System Testing
- Ignition OFF, disconnect the Int. CMP actuator solenoid harness connector at the CMP actuator solenoid.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the Int. CMP actuator solenoid.
- Connect a test lamp between the control circuit terminal B and the ignition circuit terminal A.
- Command the Int. CMP actuator solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
- If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- Determine that the vehicle has the correct engine oil. Refer to Service and Appearance Care in the owners manual.
- If the engine oil life system monitor displays the Change Oil Soon message, the engine oil is more than one year old, contains additives, or is not the correct viscosity. Change the oil.
- Inspect each CMP actuator solenoid valve assembly for the following:
- Torn screens
- Debris on the screens
- Debris clogging the oil ports
- Missing screens
- Oil seepage at the solenoid connector pins
- Inspect for the following conditions:
- Excessive timing chain play
- Proper installation of the CMP actuator assembly
- If all circuits test normal, test or replace the CMP actuator solenoid.