Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo, Regal 2001-2005

Crankshaft Position Sensor

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Removal & Installation



3.1L & 3.4L-24x Type
  1. Turn OFF the ignition.
  2.  
  3. Remove the serpentine drive belt from crankshaft pulley.
  4.  
  5. Raise the vehicle on hoist.
  6.  
  7. Remove the crankshaft harmonic balancer retaining bolt.
  8.  
  9. Remove the crankshaft harmonic balancer.
  10.  
  11. Note the routing of sensor harness before removal.
  12.  
  13. Remove the harness retaining clip with bolt.
  14.  
  15. Disconnect the sensor electrical connector.
  16.  
  17. Remove the sensor bolts.
  18.  
  19. Remove the sensor.
  20.  

To install:

  1. Install the 24X Crankshaft Position Sensor with bolts and route harness as noted during removal.
  2.  
  3. Install the harness retaining clip with bolt. Tighten the bolts to 8 ft. lbs. (10 Nm).
  4.  
  5. Connect the sensor electrical connector.
  6.  
  7. Install the balancer on the crankshaft.
  8.  
  9. Apply thread sealer to threads of the crankshaft harmonic balancer bolt. Tighten the bolt to 110 ft. lbs. (150 Nm).
  10.  
  11. Lower vehicle.
  12.  
  13. Reinstall the serpentine drive belt.
  14.  
  15. Perform the CKP System Variation Learn Procedure.
  16.  

3.1L & 3.4L-7x Type
  1. Remove the negative battery cable.
  2.  
  3. Turn the steering wheel fully to the left.
  4.  
  5. Raise vehicle on hoist.
  6.  
  7. Disconnect the electrical connector.
  8.  
  9. Remove the retaining bolt.
  10.  
  11. Remove the sensor from the engine.
  12.  
  13. If the sensor is not being replaced inspect for wear, cracks, or leakage. Replace the O-ring if necessary.
  14.  
  15. Lubricate the new O-ring with clean engine oil before installing. To install:
  16.  
  17. Install the sensor into the block.
  18.  
  19. Reinstall the retainer bolt to hold sensor to block face. Tighten the bolt to 71 inch lbs. (8 Nm).
  20.  
  21. Connect the electrical connector.
  22.  
  23. Lower the vehicle. Reconnect the negative battery cable.
  24.  

3.1L And 3.4L Engines
24x
  1. Raise and support the vehicle.
  2.  
  3. Remove the lower air deflector.
  4.  
  5. Remove the crankshaft balancer.
  6.  
  7. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
    NOTE
    Note the routing of the sensor harness before removal.

  8.  
  9. Remove the harness retaining bolt (4) and the clip (3).
  10.  
  11. Remove the CKP sensor bolts (4).
  12.  
  13. Remove the CKP sensor (1).
  14.  
  15. To install, reverse removal procedure.

    Click image to see an enlarged view

    Fig. Removing and installing CKP sensor (24X) and components

  16.  

7x
  1. Turn the steering wheel fully to the left.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the right front wheel.
  6.  
  7. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
  8.  
  9. Remove the CKP sensor bolt.
  10.  
  11. Remove the CKP sensor.
  12.  
  13. Inspect for wear, cracks, or leakage if the sensor is not being replaced.
  14.  
  15. To install, reverse removal procedure.
  16.  

3.5L
  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the starter motor.
  6.  
  7. Disconnect the crankshaft position (CKP) sensor electrical connector.
  8.  
  9. Remove the CKP sensor bolt (1).
  10.  
  11. Remove the CKP sensor (2) from the engine block.
  12.  
  13. Remove the sensor by pulling on the sensor connector. DO NOT pry on the bracket.
  14.  
  15. DO NOT rotate or twist the sensor or damage the mounting bracket if the sensor is being reused.
  16.  

To install:

  1. Install and fully seat the CKP sensor (2) into the engine block.
  2.  
  3. Install the CKP sensor bolt. Tighten the bolt to 80 inch lbs. (9 Nm).
  4.  
  5. Ensure that the CKP sensor mounting flange is contacting the engine block.
  6.  
  7. Connect the CKP sensor electrical connector.
  8.  
  9. Install the starter motor.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Lower the vehicle.
  14.  
  15. Perform CKP System Variation Learn Procedure.
  16.  

3.5L And 3.9L Engines
  1. Raise and support the vehicle.
  2.  
  3. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
  4.  
  5. Remove the CKP sensor stud.
  6.  
  7. Remove the CKP sensor.
  8.  
  9. To install, reverse removal procedure.
  10.  
  11. Lubricate the CKP sensor O-ring with clean engine oil.

    Click image to see an enlarged view

    Fig. Removing and installing CKP sensor and components-3.5L and 3.9L engines

  12.  

3.8L Engine
  1. Turn OFF the ignition.
  2.  
  3. Remove the serpentine belts from the crankshaft pulley.
  4.  
  5. Raise the vehicle.
  6.  
  7. Remove the right front wheel and tire assembly.
  8.  
  9. Remove the right inner fender access cover.
  10.  
  11. Hold the flywheel with a (J 37096) flywheel holding tool.
  12.  
  13. Using 28 mm socket, remove the crankshaft harmonic balancer retaining bolt.
  14.  
  15. Remove the crankshaft harmonic balancer, using a (J 38197-A) balancer remover.
  16.  
  17. Remove the crankshaft position sensor shield (1). Do not use a pry bar.
  18.  
  19. Disconnect the sensor electrical connector.
  20.  
  21. Remove the attaching bolts from the crankshaft position sensor.
  22.  
  23. Remove the crankshaft position sensor from the block face.
  24.  

To install:

  1. Position the crankshaft position (CKP) sensor to the block.
  2.  
  3. Install the bolts to hold the CKP sensor to the block face. Tighten the bolts to 14-28 ft. lbs. (20-40 Nm).
  4.  
  5. Reinstall the crankshaft position sensor shield.
  6.  
  7. Connect the CKP sensor electrical connector.
  8.  
  9. Position the crankshaft harmonic balancer on the crankshaft.
  10.  
  11. Hold the flywheel with a (J 37096) flywheel holding tool.
  12.  
  13. Using a (J 36660-A) torque/angle meter, tighten the harmonic balancer bolt to 110 ft. lbs. (150 Nm), plus an additional 76 degrees.
  14.  
  15. Install the right inner fender access cover.
  16.  
  17. Install the right front wheel and tire assembly.
  18.  
  19. Tighten the wheel nuts to 104 ft. lbs. (140 Nm.).
  20.  
  21. Lower the vehicle.
  22.  
  23. Reinstall the serpentine belts.
  24.  
  25. Perform the Crankshaft Variation Learn Procedure.
  26.  

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the crankshaft harmonic balancer.
  6.  
  7. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
  8.  
  9. Remove the CKP sensor shield. DO NOT use a pry bar.
  10.  
  11. Remove the CKP sensor studs.
  12.  
  13. Remove the CKP sensor.
  14.  
  15. To install, reverse removal procedure.
  16.  
  17. Tighten the studs to 22 ft. lbs. (30 Nm).
  18.  
  19. Perform the crankshaft position system variation learn procedure after reconnecting the negative battery cable.

    Click image to see an enlarged view

    Fig. Removing and installing CKP sensor and components-3.8L engine

  20.  

5.3L Engine

CAUTION
To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.

  1. Remove the right exhaust manifold
  2.  
  3. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
    CAUTION
    Clean the area around the CKP before removal in order to avoid debris from entering the engine.

  4.  
  5. Remove the CKP sensor bolt.
  6.  
  7. Remove the CKP sensor.
  8.  
  9. To install, reverse removal procedure.
  10.  
  11. Tighten the studs to 18 ft. lbs. (25 Nm).
  12.  
  13. Perform the crankshaft position system variation learn procedure after reconnecting the negative battery cable.

    Click image to see an enlarged view

    Fig. Removing and installing CKP sensor and components-5.3L engine

  14.  

Testing



Many intermittent open or shorted circuits come and go with harness and connector movement caused by vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF, with the scan tool. Observe the components operation.
     
    With the engine running, move the related connectors and wiring while monitoring engine operation
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary
     

  2.  
  3. Test the electrical connections and/or wiring by performing the following:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body, backed-out.
     
    Inspect for improperly formed or damaged terminals. Test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation.
     

  4.  

 
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