Circuit/System Testing
- Ignition OFF, disconnect the CMP actuator solenoid harness connector, C112.
- Test for less than 1 ohm between the low reference circuit ECM side, terminal E and ground.
- If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Remove the water pump from the engine. Refer to Water Pump Removal .
- Inspect and test the remaining wire harness from C112 to the CMP solenoid for an open/high resistance, or a short to ground.
- If the circuit tests normal, perform the component testing for the CMP actuator solenoid.
- If the CMP solenoid and the circuit test normal, then refer to Camshaft Position Actuator Magnet Cleaning and Inspection and Camshaft Position Actuator Solenoid Valve Inspection (On-Vehicle) or Camshaft Position Actuator Solenoid Valve Inspection (Off-Vehicle) .
IMPORTANT:
You must perform the Circuit/System Verification first.
IMPORTANT:
Incorrect engine oil viscosity, aftermarket engine oil additives, or engine oil that overdue for changing, can greatly affect the performance of the camshaft actuator.