Malibu, Malibu MAXX 2006-2008

Crankshaft Position Sensor

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Crankshaft Position System Variation Learn Procedure



  1. Install a scan tool.
  2.  
  3. Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set.
  4.  
  5. With a scan tool, select the CKP System Variation Learn Procedure and perform the following:
    1. Block drive wheels.
    2.  
    3. Set parking brake.
    4.  
    5. DO NOT apply brake pedal.
    6.  
    7. Cycle ignition from OFF to ON.
    8.  
    9. Apply and hold brake pedal for the duration of the procedure.
    10.  
    11. Start and idle engine
    12.  
    13. Turn the air conditioning (A/C) OFF.
    14.  
    15. The vehicle must remain in Park or Neutral.
    16.  

  6.  
  7. Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs.
  8.  
  9. 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, or another DTC is present, refer to Diagnostic Trouble Code (DTC) List and perform the appropriate diagnostic procedure.
  10.  
  11. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully in order to store the CKP system variation values in the ECM memory.
    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.  

The Crankshaft Position (CKP) system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:



An engine replacement
 
A engine control module (ECM) replacement
 
A crankshaft balancer replacement
 
A crankshaft replacement
 
A CKP sensor replacement
 
Any engine repairs which disturb the crankshaft to CKP sensor relationship.
 

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.

Removal & Installation



2.2L (L61) Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the starter motor.
  4.  
  5. Disconnect the engine wiring harness electrical connector from the crankshaft position (CKP) sensor.
  6.  
  7. Remove the CKP sensor bolt.
  8.  
  9. Remove the CKP sensor.
  10.  

To install:

  1. Lubricate the new CKP sensor O-ring seal with clean engine
  2.  
  3. Install the CKP sensor.
  4.  
  5. Tighten the CKP sensor bolt to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the engine wiring harness electrical connector to the CKP sensor.
  8.  
  9. Install the starter motor.
  10.  

3.5L (LZ4) & 3.9L (LZ9) Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Raise and support the vehicle
  4.  
  5. Disconnect the engine wiring harness electrical connector from the Crankshaft Position (CKP) sensor.
  6.  
  7. Remove the CKP sensor stud
  8.  
  9. Remove the CKP sensor.
  10.  

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.
  6.  
  7. Tighten the stud to 89 inch. lbs. (10 Nm).
  8.  
  9. Connect the engine wiring harness electrical connector to the CKP sensor.
  10.  
  11. Lower the vehicle.
  12.  
  13. Perform the CKP system variation learn procedure.
  14.  

Testing



Test the Crankshaft Position (CKP) sensor circuit as follows:

  1. Disconnect the CKP sensor connector.
  2.  
  3. Test for less than 1 ohm of resistance between low reference circuit and ground.
  4.  
  5. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  6.  
  7. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
  8.  
  9. 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.
  10.  
  11. If greater than the specified value, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  12.  
  13. Ignition ON, test for 4.8-5.2 volts between the signal circuit and ground.
  14.  
  15. If less than the specified range, test signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
  16.  
  17. If greater than the specified range, test signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  18.  
  19. Ignition ON, using a jumper wire connected to ground, momentarily touch the CKP sensor signal circuit repeatedly. The CKP Active Counter parameter should increment.
  20.  
  21. If the CKP Active Counter parameter does not increment, replace the ECM.

    Click image to see an enlarged view

    Fig. 2.2L (L61) engine crankshaft Position (CKP) sensor electrical connector



    Click image to see an enlarged view

    Fig. 3.5L (LZ4) & 3.9L (LZ9) engine crankshaft Position (CKP) sensor electrical connector

  22.  

Test the Crankshaft Position (CKP) sensor as follows:

  1. Inspect the CKP sensor for looseness and correct installation. Remove the CKP sensor from the engine and inspect the sensor and the O-ring for damage.
  2.  
  3. If the sensor is loose, incorrectly installed, or damaged; repair or replace the CKP sensor.
  4.  
  5. Connect the CKP Sensor connector to the CKP Sensor; turn ON the ignition, with the engine OFF.
  6.  
  7. Observe the CKP Active Counter parameter on the scan tool; pass a steel object by the tip of the sensor repeatedly. The CKP Active Counter parameter should increment.
  8.  
  9. If the parameter does not increment, replace the CKP sensor.
  10.  

 
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