Solstice 2006-2008, Sky 2007-2008

Camshaft Position Sensor

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Description & Operation



The Camshaft Position Sensors (CMP) sensors are triggered by a notched reluctor wheels built onto the intake and the exhaust camshaft sprockets. Both of the CMP sensors provide four signal pulses every camshaft revolution. Each notch, or feature of the reluctor wheel is of a different size which is used to identify the compression stroke of each cylinder and to enable sequential fuel injection. Both of the CMP sensors are connected to the ECM by the following circuits:



A 5-volt reference circuit
 
A low reference circuit
 
A signal circuit
 

Removal & Installation



2.4L (LE5) & 2.0L (LNF) Engine Exhaust Sensor
  1. Disconnect the exhaust Camshaft Position (CMP) sensor electrical connector.
  2.  
  3. Remove the CMP sensor bolt.
  4.  
  5. Remove the CMP sensor.
  6.  

To install:


NOTE
Inspect the CMP sensor for damage, replace as necessary.

  1. Lubricate the CMP sensor O-ring seal with clean engine oil.
  2.  
  3. Install the CMP sensor.
  4.  
  5. Install the CMP sensor bolt and tighten to 89 inch. lbs. (10 Nm).
  6.  

2.4L (LE5) & 2.0L (LNF) Engine Intake Sensor
  1. Disconnect the intake Camshaft Position (CMP) sensor electrical connector.
  2.  
  3. Remove the CMP sensor bolt.
  4.  
  5. Remove the CMP sensor.
  6.  

To install:


NOTE
Inspect the CMP sensor for damage, replace as necessary.

  1. Lubricate the CMP sensor O-ring seal with clean engine oil.
  2.  
  3. Install the CMP sensor.
  4.  
  5. Install the CMP sensor bolt and tighten to 89 inch. lbs. (10 Nm).
  6.  

Testing





Click image to see an enlarged view

Fig. Camshaft exhaust position sensor electrical connector 2.4L (LE5) & 2.0L (LNF) Engines



Click image to see an enlarged view

Fig. Camshaft intake position sensor electrical connector 2.4L (LE5) & 2.0L (LNF) Engines

  1. Ignition OFF, disconnect the affected Camshaft Position (CMP) sensor connector.
  2.  
  3. Test for less than 1 ohm of resistance between Electronic Control Module (ECM) side of the low reference circuit and ground.
    1. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
    2.  

  4.  
  5. Ignition ON, test for 4.8-5.2 volts between the ECM side of the 5 volt reference circuit and ground.
    1. If less than the specified range, test the 5 volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
    2.  
    3. If greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    4.  

  6.  
  7. Ignition ON, test for 4.8-5.2 volts between the signal circuit and ground.
    1. If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
    2.  
    3. If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    4.  

  8.  
  9. Ignition ON, using a jumper wire connected to ground, momentarily touch the CMP sensor signal circuit repeatedly. The applicable CMP active counter parameter should increment.
    1. If the CMP active counter does not increment, replace the ECM.
    2.  

  10.  
  11. If the circuits test normal, replace the CMP sensor.
  12.  

 
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