Vibe 2006-2007

Camshaft Position Sensor

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Description & Operation



The PCM uses the Camshaft Position (CMP) sensor to determine the position of the No. 1 piston during its power stroke. This signal is used by the PCM to calculate fuel injection mode of operation.

If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.

Removal & Installation



  1. Remove the engine cover from the engine.
  2.  
  3. Disconnect the CMP electrical connector.
  4.  
  5. Remove the CMP sensor hold-down bolt.
  6.  
  7. Remove the CMP sensor from the cylinder head.
  8.  

To install:

  1. Installation is the reverse of removal.
  2.  

Testing



  1. Check the condition of the connector. Make sure the connector is firmly attached. Check for broken or bent connector pins. Repair any connector damage before continuing with troubleshooting the issue.
  2.  
  3. Check the condition of the wiring to the connector. If the wiring is damaged, repair the wiring before continuing with any further tests.
  4.  
  5. Visually inspect the CMP sensor reluctor ring for damage, repair as needed.
  6.  
  7. Measure the voltage from the 5-volt reference circuit of the CMP sensor to a good ground. The voltage should be 5 volts. If not check the wiring for an open or short.
  8.  
  9. Measure the resistance of the low reference circuit of the CMP sensor. The resistance should be 5 Ohms. If the resistance is not as specified, check the low reference circuit of the CMP sensor for an open or high resistance.
  10.  
  11. Measure the resistance of the 5-volt reference circuit of the CMP sensor The resistance should be 5 Ohms. If the resistance is not as specified, check the 5-volt reference circuit of the CMP sensor for an open or high resistance.
  12.  
  13. If there are no issues with the wiring and connectors, replace the sensor.

    Click image to see an enlarged view

    Fig. Camshaft Position (CMP) sensor terminals; (1) Camshaft position input, (2) Sensor ground

  14.  

 
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