GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Dampener Housing with Fluid Pump Assembly

    • Inspect for worn, sticking, or damaged pressure regulator valve.
    • Inspect for worn, sticking, or damaged pressure regulator valve outer spring.
    • Inspect for worn, sticking, or damaged pressure regulator valve inner spring.
    • Inspect for worn, sticking, or damaged isolator valve and sleeve.
    • Inspect for worn, sticking, or damaged pressure relief ball valve.
    • Inspect for worn, sticking, or damaged pressure relief ball valve spring.
    • Inspect for damaged or porous pump cover assembly. Inspect for pump surfaces not flat.
    • Inspect for excessive fluid pump rotor clearance or damage. Ensure proper selective rotor is being utilized.
    • Inspect for damaged fluid pump slide. Ensure proper selective slide is being utilized.
    • Inspect for worn, sticking, or damaged fluid pump slide outer spring.
    • Inspect for worn or damaged fluid pump slide seal, seal support, pivot pin, fluid seal ring, and O-ring seal.
    • Inspect for worn or damaged fluid pump vane rings and rotor guide.

Control Valve Upper Body Assembly

    • Inspect for worn, sticking, or damaged actuator feed limit valve and spring.
    • Inspect for worn, sticking, or damaged clutch boost valve and spring.

Fluid Filter Assembly

    • Inspect for damaged or restricted fluid filter assembly.
    • Inspect for damaged fluid filter seal assembly.