Mazda Trucks 1994-1998 Repair Guide

Crankshaft Position (CKP) Sensor

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OPERATION



See Figure 1

The crankshaft position sensor, on all 1994-95 MPV models, ia an integral component of the distributor assembly.

The Crankshaft Position (CKP) sensor, located on the front cover (near the crankshaft pulley) is used to determine crankshaft position and crankshaft rpm. The CKP sensor is a reluctance sensor which senses the passing of teeth on a sensor ring because the teeth disrupt the magnetic field of the sensor. This disruption creates a voltage fluctuation, which is monitored by the PCM.



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Fig. Fig. 1: The CKP sensor (A) is triggered by the teeth which are machined into the crankshaft damper (B)

TESTING



Navajo and B Series Pick-up Models

See Figures 2 and 3

Using a DVOM set to the DC scale to monitor less than 5 volts, measure the voltage between the sensor Cylinder Identification (CID) terminal and ground by backprobing the sensor connector. If the connector cannot be backprobed, fabricate or purchase a test harness. The sensor is okay if the voltage reading varies more than 0.1 volt with the engine running at varying RPM.



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Fig. Fig. 2: CKP sensor wire harness connections for all engines except the 4.0L engine



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Fig. Fig. 3: CKP sensor wire harness connections for the 4.0L engine

1994-95 MPV Models

See Figures 4 and 5

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the distributor assembly.
  4.  
  5. Plug in the distributor connector.
  6.  
  7. Unplug the fuel injector connector.
  8.  
  9. Turn the ignition switch to the ON position.
  10.  



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Fig. Fig. 4: Engine Signal Monitor and Adapter Harness connected to the engine control module



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Fig. Fig. 5: Output signal specifications chart (JE-3.0L / G6-2.6L)

  1. Connect the Engine Signal Monitor and Adapter Harness to the engine control module as illustrated.
  2.  
  3. Set the Engine Signal Monitor.
  4.  
  5. Turn the distributor drive by hand and measure the output voltage.
  6.  
  7. If not as specified, replace the distributor assembly.
  8.  

1996-98 MPV Models

See Figure 6



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Fig. Fig. 6: Terminal identifications for measuring the resistance of the crankshaft position sensor

  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the crankshaft position sensor wiring harness connector.
  4.  
  5. Using an ohmmeter, measure the resistance between terminals A and B.
  6.  
  7. The measurement should read 950-1250 ohms at 68°F (20°C).
  8.  
  9. If not as specified, replace the crankshaft position sensor.
  10.  

REMOVAL & INSTALLATION



Navajo and B Series Pick-up Models

See Figures 7, 8, 9, 10 and 11

  1. Disconnect the negative battery cable.
  2.  



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Fig. Fig. 7: To remove the CKP sensor, first disconnect the wire harness plug ...

  1. Disengage the wiring harness connector from the CKP sensor.
  2.  
  3. Loosen the CKP sensor mounting stud/bolts, then separate the sensor form the engine front cover.
  4.  



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Fig. Fig. 8: ... then unbolt the sensor and pull it away from the engine-crankshaft damper removed for clarity

To install:

When installing a new sensor on the 4.0L engine, position the sensor against the crankshaft damper. There are small rub tabs which wear off and allow the sensor to be perfectly spaced from the damper.

  1. Position the sensor against the engine front cover, then install the mounting stud/bolts. Tighten them until snug.
  2.  
  3. Install the CKP sensor cover and retaining nuts; tighten the nuts until snug.
  4.  
  5. Reattach the wiring harness connector to the CKP sensor.
  6.  
  7. Connect the negative battery cable.
  8.  

.

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Fig. Fig. 9: Exploded view of the 2.3L Crankshaft Position (CKP) sensor



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Fig. Fig. 10: Exploded view of the 3.0L Crankshaft Position (CKP) sensor



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Fig. Fig. 11: Exploded view of the 4.0L Crankshaft Position (CKP) sensor

1994-95 MPV Models

Refer to Engine Electrical in this guide for distributor removal and installation.

1996-98 MPV Models

See Figure 12



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Fig. Fig. 12: Location of the crankshaft position sensor to the left of the crankshaft pulley

  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the crankshaft position sensor connector.
  4.  
  5. Loosen the mounting bolt and remove the crankshaft position sensor from the engine.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

 
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