Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing

Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing


Important: Camshaft Position (CMP) Actuator and Solenoid Valve Diagnosis and Testing is applicable for RPO LY6/L76/L92.


1. Measure the engine oil level. Fill, as required.
2. Using the scan tool, inspect for diagnostic codes within the engine control module (ECM). Refer to Diagnostic System Check - Vehicle . Repair, as required.
3. Verify proper engine oil pressure and operation of the active fuel management oil pressure relief valve. Refer to Oil Pressure Diagnosis and Testing (Component Tests and General Diagnostics) .
4. Inspect the CMP actuator solenoid valve for proper operation. Refer to Camshaft Position Actuator Solenoid Valve Inspection (On-Vehicle) (Overhaul)Camshaft Position Actuator Solenoid Valve Inspection (Off-Vehicle) (Overhaul) .

* If valve inspection confirms proper movement of the spool, replace the CMP actuator and CMP valve.
* If valve inspection confirms improper movement of the spool, replace only the CMP valve.

5. Verify proper operation of the CMP actuator control system. Refer to Diagnostic Starting Point - Engine Controls .