CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Crankshaft Position Sensor

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Crankshaft Position System Variation Learn Procedure



  1. Install a scan tool.
  2.  
  3. Monitor the Engine Control Module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List-Vehicle for the applicable DTC that set.
  4.  
  5. Select the Crankshaft Position (CKP) variation learn procedure with a scan tool.
  6.  
  7. The scan tool instructs you to perform the following:

    Accelerate to Wide Open Throttle (WOT).
     
    Release throttle when fuel cut-off occurs.
     
    Observe fuel cut-off for applicable engine.
     
    Engine should not accelerate beyond calibrated RPM value.
     
    Release throttle immediately if value is exceeded.
     
    Block drive wheels
     
    Set parking brake.
     
    DO NOT apply brake pedal.
     
    Cycle ignition from OFF to ON.
     
    Apply and hold brake pedal.
     
    Start and idle engine.
     
    Turn A/C OFF.
     
    Vehicle must remain in Park or Neutral.
     

  8.  
  9. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
    1. CKP sensors activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
    2.  
    3. Camshaft Position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.
    4.  
    5. Engine Coolant Temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
    6.  

  10.  
  11. Enable the CKP system variation learn procedure with a scan tool.
    NOTE
    While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

  12.  
  13. Accelerate to WOT.
  14.  
  15. Release when the fuel cut-off occurs.
  16.  
  17. Test in progress
  18.  
  19. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 . If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
  20.  
  21. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
  22.  
  23. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

    A CKP sensor replacement
     
    An engine replacement
     
    A ECM replacement
     
    A harmonic balancer replacement
     
    A crankshaft replacement
     
    Any engine repairs which disturb the CKP sensor relationship
     

  24.  

Operation



The Crankshaft Position (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.

The 5.7L engine Crankshaft Position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor circuits are connected directly to the powertrain control module (PCM) and consists of the following circuits:



The 12-volt reference circuit
 
The low reference circuit
 
The CKP sensor signal circuit
 

Removal & Installation



2.8L & 3.6L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the ignition OFF.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Reposition the wiring harness heat shield to obtain access.
  8.  
  9. Disconnect the Crankshaft Position (CKP) electrical connector.
  10.  
  11. Remove the crankshaft sensor bolt.
  12.  
  13. Remove the crankshaft sensor.
  14.  

To install:

  1. Install the crankshaft position sensor.
  2.  
  3. Install the crankshaft position sensor bolt.
  4.  
  5. Tighten the crankshaft position sensor bolt to 89 inch lbs. (10 Nm).
  6.  
  7. Connect the CKP electrical connector.
  8.  
  9. Install the wiring harness heat shield to the oil level indicator tube.
  10.  
  11. Lower the vehicle.
  12.  

4.6L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the intake manifold.
  4.  
  5. Disconnect the crankshaft position (CKP) sensor wiring harness electrical connector from the CKP sensor.
  6.  
  7. Remove the CKP sensor bolt. (cylinder heads shown removed, for clarity).
  8.  
  9. Remove the CKP sensor
  10.  

To install:

  1. Lubricate the crankshaft sensor O-ring seal with clean engine oil.
  2.  
  3. Install the CKP sensor.
  4.  
  5. Install the CKP sensor bolt.
  6.  
  7. Tighten the bolt to 89 inch lbs. (10 Nm).
  8.  
  9. Connect the CKP sensor wiring harness electrical connector to the CKP sensor.
  10.  
  11. Install the intake manifold.
  12.  
  13. Perform the CKP system variation learn procedure.
  14.  

5.7L & 6.0L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise the vehicle.
  6.  
  7. Remove the starter.
  8.  
  9. Disconnect the Crankshaft Position (CKP) sensor electrical connector.
  10.  
  11. Remove the CKP sensor retaining bolt.
  12.  
  13. Remove the CKP sensor.
  14.  

To install:

  1. Install the CKP sensor.
  2.  
  3. Install the CKP sensor retaining bolt.
  4.  
  5. Tighten the CKP sensor to 18 ft. lbs. (25 Nm).
  6.  
  7. Connect the CKP sensor electrical connector.
  8.  
  9. Install the starter.
  10.  
  11. Lower the vehicle.
  12.  
  13. Connect the negative battery cable.
  14.  
  15. Perform the CKP System Variation Learn Procedure.
  16.  

Testing



  1. Disconnect the Crankshaft Position (CKP) sensor connector.
  2.  
  3. With the ignition ON and the engine OFF, measure for 4.8-5.2 volts at the connector between the 5-volt reference circuit of the CKP sensor and a good ground.
  4.  
  5. If the voltage is less than 4.8 volts, test for an open in the 5-volt reference circuit between the ECM and the CKP sensor connector. If the circuit tests normal, replace the control module.

    Click image to see an enlarged view

    Fig. Crankshaft Position (CKP) sensor electrical connector 2.8L, 3.6L & 6.0L engines



    Click image to see an enlarged view

    Fig. Crankshaft Position (CKP) sensor electrical connector 4.6L engine



    Click image to see an enlarged view

    Fig. Crankshaft Position (CKP) sensor electrical connector 5.7L engine

  6.  

 
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