GM Service Manual Online
For 1990-2009 cars only

    Object Number: 689964  Size: SH
  1. Inspect the control valve body for the following:
  2. • A damaged or rough pump shaft bearing
    • Casting porosity
    • Interconnected oil passages
    • Damaged machined surfaces
    • Foreign material
  3. Inspect the solenoids for the following:
  4. • Cut seals
    • Bent connectors or broken wires
    • Cracked or damaged plastic housings
    • Foreign material
  5. Inspect the valves and bushings for the following:
  6. • Wear
    • Nicks
    • Scratches
  7. Inspect the springs for damaged or distorted coils.