Chrysler Full-Size Trucks 1997-2000 Repair Guide

Crankshaft Position (CKP) Sensor

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OPERATION



The crankshaft position sensor generates pulses and sends them to the PCM. The PCM interprets this input signal to determine the crankshaft position (and engine speed). With this and other information, the engine controller determines injector sequence and ignition timing. The sensor is a hall-effect device combined with an internal magnet. It is sensitive to steel within a certain distance from it.

On the 4-cylinder engine, the crankshaft position sensor is mounted to the transmission bell housing. On the V6 and V8 engines, the crankshaft position sensor is bolted to the cylinder block near the rear of the right cylinder head. On the V10 engine, the crankshaft position sensor is located on the right-lower side of the cylinder block, just above the oil pan rail



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Fig. Crankshaft position sensor location-typical



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Fig. Crankshaft position sensor-8.0L engine



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Fig. Operation of the crankshaft position sensor-typical

TESTING



On the 2.5L engine, the Crankshaft Position (CMK) sensor is located near the outer edge of the flywheel (or starter ring gear). On other models it is fitted to the right side of the engine block.

The only test you can perform without a DRBII scan tool, or equivalent, is a basic check of the sensor only.

  1. Disconnect the sensor harness connector from the main wire harness connector.
  2.  
  3. Place an ohmmeter across terminals 1 and 2 (see the illustration). The meter reading should be open (infinite resistance). If a low resistance is read, replace the camshaft position sensor.
  4.  

REMOVAL & INSTALLATION



All Except V-10 Engine
  1. Remove the air cleaner assembly if necessary for access to the sensor.
  2.  
  3. Disconnect the pigtail harness from the sensor.
  4.  
  5. Remove the nut holding the sensor wire clip to the fuel rail mounting stud.
  6.  
  7. Remove the sensor mounting hardware, then the sensor.
  8.  
  9. Remove the clip from the sensor wire harness.
  10.  

To install:

  1. Install the sensor flush against the opening.
  2.  
  3. Install and tighten the bolts or nuts, as applicable.
  4.  
  5. Install the electrical connector.
  6.  
  7. Install the clip on the sensor wire harness.
  8.  
  9. Install the clip over the fuel rail mounting stud. Install the clip mounting nut.
  10.  

V-10 Engine
  1. Raise and safely support the vehicle.
  2.  
  3. Unplug the sensor harness connector from the engine harness.
  4.  
  5. Remove the sensor mounting bolt.
  6.  
  7. Carefully pry the sensor from the timing chain case/cover in a rocking action with two small prytools.
  8.  
  9. Remove the sensor. Check the condition of the sensor O-ring.
  10.  

To install:

  1. Apply a small amount of fresh engine oil to the sensor O-ring.
  2.  
  3. Using a slight rocking action, install the sensor into the timing case/cover until the paper spacer just contacts the gear. Do NOT twist the sensor or you may tear the O-ring.
  4.  
  5. Install the mounting bolt, tightening it to 70 inch lbs. (8 Nm).
  6.  
  7. Connect the sensor wiring.
  8.  



Click image to see an enlarged view

Fig. CKP sensor's wiring: (1) GY/BK (sensor signal), (2) BK/LB (sensor ground), (3) OR (5v supply)

 
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