H3 2006

Crankshaft Position Sensor

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CKP System Variation Learn Procedure



3.5L & 3.7L Engines

Specific to:

Hummer H3 2006-2010

  1. Important: The crankshaft position (CKP) system variation learn procedure is required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

    Engine replacement
     
    Engine Control Module (ECM) replacement
     
    Crankshaft damper replacement
     
    Crankshaft replacement
     
    CKP sensor replacement
     
    Any engine repairs which disturb the crankshaft to CKP sensor relationship
     

  2.  
  3. Important: The scan tool monitors certain component signals to determine if all the conditions are met to continue with the CKP system variation learn procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:

    CKP sensor activity: If there is a CKP sensor condition, refer to the applicable DTC that set.
     
    Camshaft Position (CMP) signal activity: If there is a CMP signal condition, refer to the applicable DTC that set.
     
    Engine Coolant Temperature (ECT): If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
     

  4.  
  5. Install a scan tool.
  6.  
  7. Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Codes for the applicable DTC that set.
  8.  
  9. With a scan tool, select the CKP system variation learn procedure and perform the following:
    1. Observe the fuel cut-off for the applicable engine.
    2.  
    3. Block the drive wheels.
    4.  
    5. Set the parking brake.
    6.  
    7. Place the vehicle's transmission in Park or Neutral.
    8.  
    9. Turn the air conditioning (A/C) OFF.
    10.  
    11. Cycle the ignition from OFF to ON.
    12.  
    13. Apply and hold the brake pedal for the duration of the procedure.
    14.  
    15. Start and idle the engine.
    16.  
    17. Accelerate to Wide Open Throttle (WOT). The engine should not accelerate beyond the calibrated fuel cut-off RPM value noted above. Release the throttle immediately if the value is exceeded.
      NOTE
      Important: 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.

    18.  
    19. Release the throttle when fuel cut-off occurs.
    20.  

  10.  
  11. 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 Codes for the applicable DTC that set.
  12.  
  13. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
  14.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  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 Codes for the applicable DTC that set.
  4.  
  5. Select the CKP variation learn procedure with a scan tool.
  6.  
  7. The scan tool instructs you to perform the following:
    1. Accelerate to Wide Open Throttle (WOT).
    2.  
    3. Release throttle when fuel cut-off occurs.
    4.  
    5. Observe fuel cut-off for applicable engine.
    6.  
    7. Engine should not accelerate beyond calibrated RPM value.
    8.  
    9. Release throttle immediately if value is exceeded.
    10.  
    11. Block drive wheels.
    12.  
    13. Set parking brake.
    14.  
    15. DO NOT apply brake pedal.
    16.  
    17. Cycle ignition from OFF to ON.
    18.  
    19. Apply and hold brake pedal.
    20.  
    21. Start and idle engine.
    22.  
    23. Turn A/C OFF.
    24.  
    25. Vehicle must remain in Park or Neutral.
    26.  
    27. 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:

      CKP sensors activity: If there is a CKP sensor condition, refer to the applicable DTC that set.
       
      Camshaft Position (CMP) sensor activity: If there is a CMP sensor condition, refer to the applicable DTC that set.
       
      Engine Coolant Temperature (ECT): If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
       

    28.  

  8.  
  9. Enable the CKP System Variation Learn Procedure with a scan tool.
    NOTE
    Important: 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.

  10.  
  11. Accelerate to WOT.
  12.  
  13. Release when the fuel cut-off occurs.
  14.  
  15. Test in progress.
  16.  
  17. 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 Codes for the applicable DTC that set.
  18.  
  19. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
  20.  
  21. The CKP Variation Learn Procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:


  22.  
  23. A CKP sensor replacement
  24.  
  25. An engine replacement
  26.  
  27. A ECM replacement
  28.  
  29. A harmonic balancer replacement
  30.  
  31. A crankshaft replacement
  32.  
  33. Any engine repairs which disturb the CKP sensor relationship
  34.  

Location



Specific to:

Hummer H3 2006-2010

On 3.5L & 3.7L engines, the Crankshaft Position (CKP) sensor is located at the left rear of the engine block below the starter motor.

Click image to see an enlarged view

Fig. Crankshaft Position (CKP) sensor (1)-3.5L & 3.7L engines

On 5.3L engines, the CKP is located at the right rear of engine block, in back of starter motor.

Click image to see an enlarged view

Fig. Crankshaft Position (CKP) sensor-5.3L engine

Operation



Specific to:

Hummer H3 2006-2010

The Crankshaft Position (CKP) Sensor is a permanent magnet output coil device that monitors the speed and position of the crankshaft. A reluctor is attached directly to the crankshaft, and is used to generate a constant signal as it passes the CKP sensor magnetic coil. The CKP Sensor utilizes system voltage (12 volts DC), or reference voltage (5 volts DC) to generate a digital output signal to the PCM that is based upon a 0.5 volt AC reference. The alternating magnetic field is used by the sensor output electronics to produce a digital pulse. The CKP sensor returns a digital ON/OFF signal pulse during each revolution of the crankshaft, with a momentary signal interrupt for the top dead center (TDC) position of the #1 cylinder. The Pulse Width Modulation pattern is used by the Powertrain Control Module (PCM) to calculate ignition timing, fuel injector timing, misfire diagnostics, and the tachometer display.

Removal & Installation



3.5L & 3.7L Engines

Specific to:

Hummer H3 2006-2010

  1. Raise and support the vehicle.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Crankshaft Position (CKP) sensor.

    Click image to see an enlarged view

    Fig. Disconnect the CKP electrical connector

  4.  
  5. Remove the CKP sensor bolt.
  6.  
  7. Remove the CKP sensor from the engine block.
  8.  
  9. Discard the O-ring seals.

    Click image to see an enlarged view

    Fig. CKP sensor removal

  10.  

To install:

  1. Install new O-ring seals to the CKP sensor.
  2.  
  3. Lightly lubricate the O-ring seals with clean engine oil.
  4.  
  5. Install the CKP sensor into the engine block.
  6.  
  7. Add sealer GM P/N 12346004 (Canadian P/N 10953480) to the CKP sensor bolt threads.
  8.  
  9. Install the CKP sensor bolt. Tighten the bolt to 89 inch lbs. (10 Nm).
  10.  
  11. Connect the engine wiring harness electrical connector to the CKP sensor.
  12.  
  13. Lower the vehicle.
  14.  
  15. Perform the CKP system variation learn procedure.
  16.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  1. Remove the starter.
  2.  
  3. Disconnect the engine wiring harness electrical connector from the Crankshaft Position (CKP) sensor.

    Click image to see an enlarged view

    Fig. Disconnect the CKP electrical connector

  4.  
  5. Clean the area around the CKP sensor before removal in order to avoid debris from entering the engine.
  6.  
  7. Remove the CKP sensor bolt.
  8.  
  9. Remove the CKP sensor.

    Click image to see an enlarged view

    Fig. CKP sensor removal

  10.  

To install:

  1. Install the CKP sensor.
  2.  
  3. Install the CKP sensor bolt. Tighten the bolt to 18 ft. lbs. (25 Nm).
  4.  
  5. Connect the engine wiring harness electrical connector to the CKP sensor.
  6.  
  7. Install the starter.
  8.  
  9. Perform the crankshaft position system variation learn procedure.
  10.  

Testing



Specific to:

Hummer H3 2006-2010


NOTE
Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

CKP Circuit Testing

Specific to:

Hummer H3 2006-2010

Use a suitable scan tool or a Graphing Multi-Meter (GMM in order to view the CKP data.

CKP Sensor logic is based on alternating lines of magnetic flux which generate a digital ON/OFF signal to the PCM, and are based on the speed and position of the crankshaft.

Verify that the engine timing components (timing belt, timing chain, or timing gears) are properly installed, and that there is no foreign material obstructing the path between the reluctor and the CKP sensor. If any engine mechanical faults are evident, locate and repair as required before continuing.

A Digital Volt-Ohm Meter (DVOM) may be used to verify the condition of the wiring: additional information may be acquired by taking measurements at the sensor connector as well as the PCM connector. If significant resistance is measured (greater than 5 ohms), check the wiring harness and connections for corrosion, poor pin connections, or damaged wires.

If all engine wiring and pin connections are confirmed, disconnect the CKP Sensor to verify the signal with a GMM, and verify PCM communication before replacing the CKP Sensor.

Click image to see an enlarged view

Fig. CKP Sensor Range Chart

CKP Sensor Strategy

Specific to:

Hummer H3 2006-2010

The CKP Sensor provides a digital input signal to the Powertrain Control Module (PCM) for a number of engine control system calculations. The CKP signal is compared with the Camshaft Position Sensor (CMP) and Vehicle Speed Sensor (VSS) for measured operating conditions, and the Pulse Width Modulation pattern is used by the Powertrain Control Module (PCM) to calculate ignition timing, fuel injector timing, misfire diagnostics, and the tachometer display.

Connection & Wiring Diagnosis

Specific to:

Hummer H3 2006-2010

Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following tests:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF. Using a suitable the scan tool, observe the component operation.
     
    With the engine running, move the related connectors and wiring while monitoring component operation.
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary.
     

  2.  
  3. Test the connector terminal pins and/or wiring by performing the following tests:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.
     
    Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
     

  4.  

Related Diagnostic Trouble Codes

Specific to:

Hummer H3 2006-2010



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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