GM Service Manual Online
For 1990-2009 cars only

Inspect the following components:

    • The flow control valve for proper operation
    • The pressure plate for proper mating with the cam ring
    • The cam ring for wear or damage
    • The pressure plate for wear or damage
    • The thrust plate for wear or damage
    • The rotor for wear or damage
    • The rotor slots for proper vane operation
    • The pump for high internal leakage