GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Camshaft Position (CMP) Sensor

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OPERATION



The Camshaft Position (CMP) sensor is used to correlate crankshaft-to-camshaft position so that the PCM can determine which cylinder is ready to be fueled by the injector. The CMP sensor is also used to determine which cylinder is misfiring when when misfire is present. If the computer control module receives an intermittent signal from the CMP, then the "CMP Resync Counter" will increment. When the PCM cannot use the information from the CMP sensor, a Diagnostic Trouble Code (DTC) is set.

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Detach the sensor harness connector at the sensor.
  4.  
  5. Unfasten the retaining bolt, then remove the sensor from the camshaft housing. Inspect the sensor O-ring for wear, cracks or leakage and replace if necessary.
  6.  

To install:
  1. Lubricate the O-ring with clean engine oil, then place on the sensor. Install the sensor into the camshaft housing.
  2.  
  3. Install the CMP sensor retaining bolt, then tighten to 88 inch lbs. (10 Nm).
  4.  
  5. Attach the sensor harness connector.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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