GM Service Manual Online
For 1990-2009 cars only

Caution: Refer to Camshaft Position Actuator Removal and Installation Caution in the Preface section.


    Object Number: 1714946  Size: SH
  1. Insert a tie strap (1) through the center of the camshaft position (CMP) actuator and over the reluctor wheel.

  2. Object Number: 1658213  Size: SH
  3. Clean the CMP actuator with cleaning solvent.
  4. Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.

  5. Dry the components with compressed air.
  6. Inspect the CMP actuator for a broken spring (1).

  7. Object Number: 1658211  Size: SH
  8. Inspect the CMP actuator for the following conditions:
  9. • Improper positioning of the CMP reluctor wheel. The actuator return spring should reposition the reluctor wheel to the PARK position. Inspect for proper alignment of the mark on the face of the sprocket (1) with the flat edge of the reluctor wheel (2). If the reluctor wheel is not properly positioned, the internal components of the actuator are sticking or the return spring is broken and the actuator should be replaced as an assembly.
    • Nicked or damaged edges (3) on the CMP reluctor wheel
    • Damaged timing chain teeth (4)

    Object Number: 1658215  Size: SH
  10. Inspect the CMP actuator for dirt, debris, or restrictions within the oil passages (1, 2, 3).

  11. Object Number: 1658210  Size: SH
  12. Inspect the timing chain tensioner for the following conditions:
  13. • Damaged or broken tension spring (1)
    • Excessive wear or scoring on the chain guide surfaces (2, 3)