Solstice 2006-2008, Sky 2007-2008

Crankshaft Position Sensor

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Crankshaft Position System Variation Learn Procedure



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
 

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.
 

  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.
  4.  
  5. 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 in step (A). Release the throttle immediately if the value is exceeded.
      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.

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

  6.  
  7. 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).
  8.  
  9. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
  10.  

Operation



The Crankshaft Position (CKP) sensor is connected to the Electronic Control Module (ECM) by the following circuits:



A 5-volt reference circuit
 
A low reference circuit
 
A 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 rotational 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, along with information from the CMP sensors is then used to determine the optimum ignition and fuel 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



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the Crankshaft Position (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 no. 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.  

Testing





Click image to see an enlarged view

Fig. Crankshaft sensor electrical connector 2.4L (LE5) & 2.0L (LNF) Engines

  1. Disconnect the Crankshaft Position (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 Electronic Control Module (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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