Circuit/System Testing
IMPORTANT:
Incorrect engine oil viscosity, aftermarket engine oil additives, or engine oil that is overdue for changing, can greatly affect the performance of the camshaft actuator.
- Ignition OFF, inspect the crankshaft balancer bolt for the proper torque. Refer to Fastener Tightening Specifications
.
- If the crankshaft balancer bolt is not at the proper torque, refer to Crankshaft Balancer Replacement .
- Remove the CMP actuator solenoid. Refer to Camshaft Position Actuator Solenoid Valve Replacement .
- Connect a fused jumper wire between the CMP actuator high control circuit at the solenoid and B+. Connect a jumper wire to the CMP actuator low reference circuit at the solenoid. Momentarily touch the jumper wire to ground. Observe the spool valve inside the CMP actuator. The spool valve should move from fully closed to fully opened position.
- If the spool valve inside the CMP actuator solenoid does not move, replace the CMP actuator solenoid.
- Inspect the CMP actuator for binding or being stuck.
- Inspect the engine for correct valve timing. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .