GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Torque Converter Housing with Fluid Pump Assembly (2)

    • Inspect for worn, sticking, or damaged pressure regulator valve (233).
    • Inspect for worn, sticking, or damaged pressure regulator valve outer spring (234).
    • Inspect for worn, sticking, or damaged pressure regulator valve inner spring (235).
    • Inspect for worn, sticking, or damaged isolator valve (236) and sleeve (237).
    • Inspect for worn, sticking, or damaged pressure relief ball valve (225).
    • Inspect for worn, sticking, or damaged pressure relief ball valve spring (224).
    • Inspect for damaged or porous pump cover assembly (219). Inspect for pump surfaces not flat.
    • Inspect for excessive fluid pump rotor (217) clearance or damage. Ensure proper selective rotor is being utilized.
    • Inspect for damaged fluid pump slide (212). Ensure proper selective slide is being utilized.
    • Inspect for worn, sticking, or damaged fluid pump slide outer spring (211).
    •  Inspect for worn or damaged fluid pump slide seal (213), seal support (214), pivot pin (215), fluid seal ring (209), and O-ring seal (210).
    • Inspect for worn or damaged fluid pump vane rings (207) and rotor guide (208).

Control Valve Upper Body Assembly (321)

    • Inspect for worn, sticking, or damaged actuator feed limit valve (325) and spring (324).
    • Inspect for worn, sticking, or damaged clutch boost valve (329) and spring (330).

Fluid Filter Assembly (26)

    • Inspect for damaged or restricted fluid filter assembly (26).
    • Inspect for damaged fluid filter seal assembly (25).