G6 2005-2007

Crankshaft Position Sensor

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Operation



The CKP sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. The CKP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the CKP sensor. The ECM uses each CKP signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CKP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.

Removal & Installation



2.4L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the CKP sensor electrical connector.
  4.  
  5. Remove the oil level indicator tube.
  6.  
  7. Remove the positive battery cable nut from the starter solenoid.
  8.  
  9. Remove the positive battery cable from the starter solenoid.
  10.  
  11. Remove Starter motor.
  12.  
  13. Remove the CKP sensor bolt
  14.  
  15. Remove the CKP sensor.
  16.  

To Install:

  1. Lubricate the CKP sensor O-ring seal with clean engine oil.
  2.  
  3. Install the CKP sensor.
  4.  
  5. Install the CKP sensor bolt and tighten to 89 inch. lbs. (10 Nm).
  6.  
  7. Ensure that the engine harness terminal is still installed on the starter solenoid.
  8.  
  9. Install starter motor.
  10.  
  11. Install the positive battery cable to the starter solenoid.
  12.  
  13. Install the positive battery cable nut to the starter solenoid and tighten to 89 inch. lbs. (10 Nm).
  14.  
  15. Connect the CKP sensor electrical connector (3).
  16.  
  17. Install the oil level indicator tube.
  18.  
  19. Connect the negative battery cable.
  20.  

3.5L Engine
  1. Raise and support the vehicle.
  2.  
  3. Disconnect the CKP sensor electrical connector.
  4.  
  5. Remove the CKP sensor bolt.
  6.  
  7. Remove the CKP sensor.
    NOTE
    Inspect for wear, cracks, or leakage if the sensor is not being replaced.

  8.  

To Install:

  1. Lubricate the O-ring with clean engine oil before installation and replace the O-ring if necessary.
  2.  
  3. Install the CKP sensor.
  4.  
  5. Install the CKP sensor bolt and tighten to 97 inch. lbs. (11 Nm).
  6.  
  7. Connect the CKP sensor electrical connector.
  8.  
  9. Lower the vehicle.
  10.  
  11. Perform the CKP system variation learn procedure.
  12.  

3.6L Engine
  1. Remove the exhaust manifold lower heat shield.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the CKP.
  4.  
  5. Remove the crankshaft sensor bolt.
  6.  
  7. Remove the crankshaft sensor.
  8.  

To Install:

  1. Install the crankshaft position sensor.
  2.  
  3. Install the crankshaft position sensor bolt and tighten to 89 inch. lbs. (10 Nm).
  4.  
  5. Connect the engine wiring harness electrical connector (2) to the CKP sensor.
  6.  
  7. Install the exhaust manifold lower heat shield.
  8.  

3.9L Engine
  1. Raise and support the vehicle.
  2.  
  3. Disconnect the CKP sensor electrical connector.
  4.  
  5. Remove the CKP sensor stud.
  6.  
  7. Remove the CKP sensor.
  8.  

To Install:

  1. Lubricate the CKP sensor O-ring with clean engine oil.
  2.  
  3. Install the CKP sensor.
  4.  
  5. Install the CKP sensor stud and tighten to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the CKP sensor electrical connector.
  8.  
  9. Lower the vehicle.
  10.  

Testing





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Fig. Crankshaft Position (CKP) Sensor electrical connector

  1. Disconnect the CKP sensor connector.
  2.  
  3. Test for less than 1 ohm of resistance between 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 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 5volt 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 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 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 CKP sensor signal circuit repeatedly. The CKP Active Counter parameter should increment
    1. If the CKP Active Counter parameter does not increment, replace the ECM.
    2.  

  10.  

 
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