GM Malibu/Cutlass 1997-2000

Crankshaft Position (CKP) Sensor

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OPERATION




NOTE
More detail on the relationship between the CKP sensor and the PCM is given in Section 2 of this guide.

2.4L Engine

The Crankshaft Position (CKP) sensor provides a signal through the ignition module which the PCM uses as a reference to calculate rpm and crankshaft position.

3.1L Engine
7X CKP SENSOR

The Ignition Control Module (ICM) uses the 7X CKP sensor to generate 3X reference pulses which the PCM uses to calculate RPM and crankshaft position. The PCM also uses the pulses on this circuit to initiate injector pulses.

24x CKP SENSOR

The 24X CKP sensor is used to improve idle spark control at engine speeds up to approximately 1250 RPM.

TESTING



  1. Turn the ignition key OFF .
  2.  


NOTE
Inspect crank sensor and connector for signs of oil leaking through the sensor. This would indicate a defective sensor.

  1. Unplug the sensor electrical harness and check the terminals for corrosion and damage.
  2.  
  3. Check the sensor wiring harness wires for continuity and repair as necessary.
  4.  
  5. Disconnect the sensor and connect the test leads across the terminals A and B .
  6.  
  7. Resistance should be between 900-1200 ohms.
  8.  

REMOVAL & INSTALLATION





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Fig. Crankshaft Position (CKP) sensor location-2.4L engine



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Fig. Location of the 7X CKP sensor on the 3.1L engine



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Fig. Exploded view of the 24X CKP sensor, mounting bracket, and bolts-3.1L engine

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support it with jackstands.
  4.  
  5. If necessary, remove the steering linkage shield.
  6.  
  7. Unplug the CKP sensor harness connector from the sensor.
  8.  
  9. Unfasten the retaining bolt above the oil filter. Inspect the sensor O-ring for wear, cracks or leakage and replace if necessary.
  10.  

To install:

  1. Lubricate the O-ring with clean engine oil, then place it on the sensor.
  2.  
  3. Install the sensor and tighten the retaining bolt to 88 inch lbs. (10 Nm).
  4.  
  5. Attach the sensor harness connector.
  6.  
  7. If removed, install the steering linkage shield.
  8.  
  9. Lower the vehicle.
  10.  
  11. Connect the negative battery cable.
  12.  

 
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