Montana, Silhouette, Venture 2000-2005

Crankshaft Position Sensor

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Crankshaft Position System Variation Learn Procedure



The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set. Refer to Diagnostic Aids for DTC P0300. The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:



DTC P1336 is set.
 
The PCM has been replaced.
 
The engine has been replaced.
 
The crankshaft has been replaced.
 
The crankshaft harmonic balancer has been replaced.
 
The crankshaft position sensor has been replaced.
 


CAUTION
The scan tool crankshaft position system variation learn function will be inhibited if engine coolant temperature is less than 70C (158F). Allow the engine to warm to at least 70C (158F) before attempting the crankshaft position system variation learn procedure. The scan tool crankshaft position system variation learn function will be inhibited if any Powertrain DTCs other than DTC P1336 are set before or during the crankshaft position system variation learn procedure. Diagnose and repair any DTCs if set. Refer to applicable DTCs. The crankshaft position system variation learn function will be inhibited if the PCM detects a malfunction involving the camshaft position signal circuit, the 3X reference circuit, or the 24X reference circuit. If a malfunction has been indicated, refer to the following list to diagnoses the system or sensor.



DTC P0336 Crankshaft Position (CKP) Sensor Circuit.
 
DTC P0341 Camshaft Position (CMP) Sensor Performance.
 
DTC P1374 Crankshaft Position (CKP) High to Low Resolution Frequency Correlation.
 

The scan tool crankshaft position system variation learn function will not be enabled until engine coolant temperature reaches 158F (70C). Selecting the crankshaft position system variation learn procedure on the scan tool will command the PCM to enable CKP system variation learn fuel cutoff and allow the crankshaft position system variation compensating values to be stored in the PCM. The PCM must detect an engine speed of 5150 RPM (CKP system variation learn fuel cutoff) during the crankshaft position system variation learn procedure to store the crankshaft position system variation compensating values and complete the procedure.


CAUTION
Set the vehicle parking brake and block the drive wheels when performing the Crankshaft Position System Variation Learning Procedure in order to prevent personal injury. Release the throttle when the engine reaches the second fuel cut off. Leaving the throttle open during the fuel cut off will allow the engine to decel at an even rate. Once the learn procedure is completed, the PCM will return the engine control to the operator and the engine will respond to the throttle position.

  1. Set the parking brake.
  2.  
  3. Block the drive wheels.
  4.  
  5. Ensure the hood is closed.
  6.  
  7. Start the engine and allow engine coolant temperature to reach at least 70C (158F).
  8.  
  9. Turn off the ignition switch.
  10.  
  11. Select and enable the crankshaft position variation learn procedure with the scan tool.
  12.  
  13. Start the vehicle.
  14.  
  15. Apply and hold the service brake pedal firmly.
  16.  
  17. Ensure the transaxle is in park.
  18.  
  19. Increase accelerator pedal position and hold until the fuel cutoff is reached at 5150 RPM. Release the accelerator pedal after the second fuel cutoff has been reached.
  20.  
  21. The crankshaft position system variation compensating values are learned when the RPM decreases back to idle. If the procedure terminates.
  22.  
  23. Observe DTC status for DTC P1336.
  24.  
  25. If the scan tool indicates that DTC P1336 ran and passed, the crankshaft position system variation learn procedure is complete. If the scan tool indicates DTC P1336 failed or not run, determine if other DTCs have set. If DTCs other than P1336 are not set, repeat the crankshaft position system variation learn procedure as necessary.
  26.  

The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether or not DTC P0315 is set:



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

  1. Install a scan tool.
  2.  
  3. Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List.
  4.  
  5. Select the crankshaft position variation learn procedure with a scan tool.
  6.  
  7. The scan tool instructs you to perform the following:
    NOTE
    Vehicle must remain in Park or Neutral. 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:


    CAUTION
    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.



    Accelerate to wide open throttle (WOT)
     
    Observe fuel cut-off for applicable engine
     
    Release throttle when fuel cut-off occurs
     
    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 the A/C OFF
     



    Crankshaft position (CKP) sensors activity--If there is a CKP sensor condition, refer to the applicable DTC
     
    Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC
     
    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
     

  8.  
  9. Enable the CKP system variation learn procedure with the scan tool and perform the following:
    1. Accelerate to WOT.
    2.  
    3. Release throttle when fuel cut-off occurs.
    4.  

  10.  
  11. The scan tool displays Learn Status: Learned this ignition.
  12.  
  13. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete.
  14.  
  15. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 in Diagnostic Trouble Codes List.
  16.  
  17. If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List .
  18.  
  19. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
  20.  

Operation



The Crankshaft Position (CKP) sensor is a 3-wire sensor based on the magneto resistive principle. A magneto resistive sensor uses 2 magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The CKP sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution. The pulse width encoding pattern is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is used for ignition timing, fuel injector timing, misfire diagnostics, and tachometer display. The powertrain control module (PCM) supplies a 12-volt reference, a low reference, and a medium resolution engine speed signal circuit to the CKP sensor.

The crankshaft reluctor wheel is mounted in the middle of the crankshaft. The wheel is comprised of three 120-degree segments. Each segment represents a pair of cylinders at top dead center (TDC), and is further divided into six 20-degree segments. Within each 20-degree segment is a notch of 2 different sizes. Each 120-degree segment has a unique pattern of notches. This is known as pulse width encoding. This pulse width encoding pattern allows the PCM to quickly recognize which pair of cylinders are at TDC. The reluctor wheel is also a dual track, or mirror image, design. This means there is an additional wheel pressed against the first wheel with a gap of equal size to each notch of the mating wheel. When one sensing element of the CKP sensor is reading a notch, the other is reading a set of teeth. The resulting signals are then converted into a digital square wave output by the circuitry within the CKP sensor.

Removal & Installation



3.1L & 3.4L-24x Type
  1. Turn OFF the ignition.
  2.  
  3. Remove the serpentine drive belt from crankshaft pulley.
  4.  
  5. Raise the vehicle on hoist.
  6.  
  7. Remove the crankshaft harmonic balancer retaining bolt.
  8.  
  9. Remove the crankshaft harmonic balancer.
  10.  
  11. Note the routing of sensor harness before removal.
  12.  
  13. Remove the harness retaining clip with bolt.
  14.  
  15. Disconnect the sensor electrical connector.
  16.  
  17. Remove the sensor bolts.
  18.  
  19. Remove the sensor.
  20.  

To install:

  1. Install the 24X Crankshaft Position Sensor with bolts and route harness as noted during removal.
  2.  
  3. Install the harness retaining clip with bolt. Tighten the bolts to 8 ft. lbs. (10 Nm).
  4.  
  5. Connect the sensor electrical connector.
  6.  
  7. Install the balancer on the crankshaft.
  8.  
  9. Apply thread sealer to threads of the crankshaft harmonic balancer bolt. Tighten the bolt to 110 ft. lbs. (150 Nm).
  10.  
  11. Lower vehicle.
  12.  
  13. Reinstall the serpentine drive belt.
  14.  
  15. Perform the CKP System Variation Learn Procedure.
  16.  

3.1L & 3.4L-7x Type
  1. Remove the negative battery cable.
  2.  
  3. Turn the steering wheel fully to the left.
  4.  
  5. Raise vehicle on hoist.
  6.  
  7. Disconnect the electrical connector.
  8.  
  9. Remove the retaining bolt.
  10.  
  11. Remove the sensor from the engine.
  12.  
  13. If the sensor is not being replaced inspect for wear, cracks, or leakage. Replace the O-ring if necessary.
  14.  
  15. Lubricate the new O-ring with clean engine oil before installing. To install:
  16.  
  17. Install the sensor into the block.
  18.  
  19. Reinstall the retainer bolt to hold sensor to block face. Tighten the bolt to 71 inch lbs. (8 Nm).
  20.  
  21. Connect the electrical connector.
  22.  
  23. Lower the vehicle. Reconnect the negative battery cable.
  24.  

3.9L Engine
  1. Remove the exhaust manifold.
  2.  
  3. Disconnect the sensor electrical connector.
  4.  
  5. Remove the CKP sensor bolt.
  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 sensor electrical connector.
  8.  
  9. Install the exhaust manifold.
  10.  

 
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