Corolla 2006-2007

Camshaft Position Sensor

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Operation



Specific to:

Toyota Corolla 2006-2008

The Camshaft Position (CMP) sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the CMP sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice the voltage is generated 3 times in the CMP sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

Removal & Installation



Specific to:

Toyota Corolla 2006-2008

  1. Remove camshaft position sensor retaining bolt.
  2.  
  3. Disconnect camshaft position sensor connector.
  4.  
  5. Remove sensor.
  6.  

To install:

  1. Reverse removal procedure.
  2.  

Testing



Specific to:

Toyota Corolla 2006-2008

  1. Possible causes:
    1. DTC P0340 indicates a malfunction relating to the CMP sensor (+) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).
    2.  
    3. DTC P0341 indicates a malfunction relating to the CMP sensor (-) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).

      Click image to see an enlarged view

      Fig. Possible causes chart

    4.  

  2.  
  3. Use wiring diagrams to test resistance in sensor.
  4.  
  5. If sensor is not within standard specifications, replace sensor.

    Cold: 835 to 1,400 ohms
     
    Hot: 1,060 to 1,645 ohms
     

  6.  
  7. Alternative inspection: Inspection using an oscilloscope. G2+ stands for the CMP sensor signal, and NE+ stands for the Camshaft Position (CKP) sensor signal.

    Click image to see an enlarged view

    Fig. Oscilloscope wave form



    Click image to see an enlarged view

    Fig. Oscilloscope wave form pinout

  8.  

 
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