GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

    • J 36660-A Torque/Angle Meter
    • J 37096 Flywheel Holding Tool
    • J 38197-A Balancer Remover

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the serpentine belt(s) from the crankshaft pulley.
  3. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  4. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Remove the right front wheel and tire assembly.
  6. Remove the right inner fender access cover.
  7. Hold the flywheel with J 37096 Flywheel Holding Tool.
  8. Using 28 mm socket, remove the crankshaft harmonic balancer retaining bolt.
  9. Remove the crankshaft harmonic balancer using special tool J 38197-A Balancer Remover.
  10. Important: Do Not use a pry bar.


    Object Number: 12302  Size: SH
  11. Remove the crankshaft position sensor shield (1).
  12. Disconnect the sensor electrical connector.
  13. Remove 2 attaching bolts from the crankshaft position sensor.

  14. Object Number: 12303  Size: SH
  15. Remove the crankshaft position sensor from block face.

Installation Procedure


    Object Number: 12303  Size: SH
  1. Position the crankshaft position (CKP) sensor to the block.
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the bolts to hold the CKP sensor to the block face.
  4. Tighten
    Tighten the bolts to 20-40 N·m (14-28 lb ft).


    Object Number: 12302  Size: SH
  5. Install the crankshaft position sensor shield.
  6. Connect the CKP sensor electrical connector.
  7. Position the crankshaft harmonic balancer on the crankshaft.
  8. Hold the flywheel withJ 37096 Flywheel Holding Tool.
  9. Tighten
    Tighten the harmonic balancer bolt to 150 N·m +76 degrees (110 lb ft +76 degrees).

  10. Install the right inner fender access cover.
  11. Install the right front wheel and tire assembly.
  12. Tighten
    Tighten the lug nuts to 140 N·m (104 lb ft).

  13. Lower the vehicle.
  14. Install the serpentine belt(s).
  15. Connect the negative battery cable.
  16. Perform the Crankshaft Position System Variation Learn Procedure. Refer to Crankshaft Position System Variation Learn .