GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Crankshaft Position (CKP) Sensor

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OPERATION



The Crankshaft Position (CKP) sensor (formerly named simply crankshaft sensor) is mounted remotely from the ignition module on an aluminum cover plate. Based on CKP sensor pulses, the sensor sends a reference signal to the computer control module, which is used to determine crankshaft position and engine speed.

TESTING



This test requires the use of a Tech 1® or equivalent scan tool.

  1. Idle the engine for 5 minutes or until the Malfunction Indicator Light (MIL) turns on.
  2.  
  3. Install a scan tool. Does the scan tool display DTC 19-
  4.  
  5. If the scan tool displays the DTC, proceed as follows:
    1. With the engine running, wiggle the connections of the PCM and CKP sensor and related wires while listening for engine stumble.
    2.  
    3. If the engine does not stumble, inspect the sensor, sensor wiring and connectors and replace as necessary.
    4.  
    5. If the engine stumbles, repair the faulty circuit(s) or connector(s) and retest for the DTC.
    6.  

  6.  
  7. If the scan tool does not display the specified DTC, proceed as follows:
  8.  
  9. Observe the scan tool 7X resync while operating all non-engine components on the vehicle. There should be no 7X resync during the operation of the components.
  10.  
  11. If there is no resync, with the engine running, wiggle the connections of the PCM and CKP sensor and related wires while listening for engine stumble.
    1. If the engine does not stumble, the DTC is intermittent.
    2.  
    3. If the engine stumbles, repair the faulty circuit(s) or connector(s) and retest for the DTC.
    4.  

  12.  
  13. If there is resync, repair the circuits of the fault components and retest for the DTC.
  14.  

REMOVAL & INSTALLATION



Except 2.0L (VIN H) Engine

See Figure 1

  1. Disconnect the negative battery cable.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Location of the CKP sensor and related components - 2.2L (VIN 4) engine

  1. For the 2.2L (VIN G and 4), raise and safely support the vehicle.
  2.  
  3. Disconnect the sensor harness plug/connector.
  4.  
  5. Unfasten the sensor-to-block bolt/nut, then remove the sensor from the engine.
  6.  
  7. Inspect the sensor O-ring for damage and replace, if necessary. Be sure to lubricate the O-ring with clean engine oil prior to installation.
  8.  

To install:
  1. Position the sensor in the block, then install the sensor retaining bolt/nut.
  2.  
  3. Tighten the sensor bolt to 71 inch lbs (8 Nm).
  4.  
  5. Attach the sensor harness plug/connector.
  6.  
  7. If raised, carefully lower the vehicle.
  8.  
  9. Connect the negative battery cable.
  10.  

2.0L (VIN H) Engine

See Figure 2

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: The CKP sensor mounting on the 2.0L (VIN H) engine

  1. Remove the two lower power steering bracket nuts.
  2.  
  3. Carefully remove the vehicle, then remove the serpentine belt.
  4.  
  5. Unfasten the four bolts and two nuts, then remove the alternator from its mount, including removing the hinge and crankcase ventilation tube.
  6.  
  7. Remove the upper power steering brace by unfastening the 3 bolts.
  8.  
  9. Unfasten the retaining lower bracket bolts, then set the power steering pump assembly aside.
  10.  
  11. Unfasten the 4 bolts and 1 nut securing the timing belt cover, then remove the cover.
  12.  
  13. Detach the CKP sensor harness behind the engine and cut tie strap.
  14.  
  15. Feed the harness behind the timing plate, then remove the harness and CKP sensor.
  16.  

To install:
  1. Raise and safely support the vehicle.
  2.  
  3. Install the CKP sensor in the engine (1 bolts), then feed the harness through the A/C compressor mount.
  4.  
  5. Carefully lower the vehicle.
  6.  
  7. Feed the sensor wiring harness behind the timing plate.
  8.  
  9. Connect the harness at the rear of the engine, then install the tie strap.
  10.  
  11. Position the timing belt cover, then secure using the retainers.
  12.  
  13. Install the 2 top bolts for the lower power steering bracket.
  14.  
  15. Install the alternator, including the hinge and crankcase ventilation tube.
  16.  
  17. Raise and safely support the vehicle.
  18.  
  19. Secure the two lower power steering bracket nuts.
  20.  
  21. Carefully lower the vehicle.
  22.  
  23. Install the serpentine belt.
  24.  
  25. Attach the sensor-to-engine harness.
  26.  
  27. Connect the negative battery cable.
  28.  

 
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