Jeep Wagoneer/Commando/Cherokee 1984-1998

Crankshaft Position (CKP) Sensor

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OPERATION



See Figures 1 and 2

The Crankshaft Position Sensor, or CKP sensor provides the PCM with information about engine speed and crankshaft position. It is located near the bellhousing.

The CKP sensor contains a Hall effect device which sends either a 0.0 volt or a 5.0 volt signal to the PCM depending on the position of the distributor shaft.

The PCM uses the CKP sensor signal to determine fuel injection event time among other things. The engine will not run without the CKP sensor signal.



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Fig. Fig. 1: View of the crankshaft position sensor and its location-1996 5.2L engine shown



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Fig. Fig. 2: View of the crankshaft position sensor and its location-1996 4.0L engine shown

TESTING



See Figures 3 and 4



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Fig. Fig. 3: Connector terminals for the Crankshaft Position (CKP) sensor



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Fig. Fig. 4: Checking the CKP sensor voltage between the wiring harness side and battery ground

  1. Backprobe with a high impedance ohmmeter between the CKP sensor connector middle terminal and battery ground.
  2.  
  3. Verify that the resistance is less than 5 ohms. If the resistance is not as specified, repair or replace the wiring as necessary and continue the test.
  4.  
  5. With the ignition ON and the engine OFF , backprobe with a high impedance voltmeter between the sensor connector middle terminal and either of the end terminals.
  6.  
  7. Verify that a 5 volt or greater signal is present at one of the two terminals. If not as specified, repair or replace the wiring as necessary and continue the test.
  8.  
  9. With the ignition ON and the engine OFF , backprobe with a high impedance voltmeter between the sensor connector middle terminal and the end terminal that did not have the 5 volt or greater signal.
  10.  
  11. Crank the engine and verify that the voltage reading alternates between 0.0 and 5.0 volts or verify that the voltage reading is 2.5 volts (averaging voltmeters only).
  12.  
  13. If the voltage readings are not as specified, the sensor may be faulty.
  14.  

Removal & Installation



4.0L Engine
  1. The CKP sensor is located on the transmission bellhousing. Disengage the sensor wiring connector and remove the sensor wiring hold-down clip from the fuel rail.
  2.  
  3. Remove the sensor mounting bolt and carefully pull the sensor out of the bellhousing.
  4.  
  5. Installation is the reverse of removal.
  6.  

5.2L and 5.9L Engine
  1. The CKP sensor is bolted to the top of the cylinder block near the rear of the right cylinder head. Disengage the sensor wiring connector and remove the two sensor mounting bolts.
  2.  
  3. Carefully pull the sensor out of the cylinder block.
  4.  
  5. Installation is the reverse of removal.
  6.  

 
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