Mazda Trucks 1987-1993 Repair Guide

Crankshaft Position (CKP) Sensor

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OPERATION



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.

TESTING



Navajo

See Figure 1

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

Pick-up and MPV Models

See Figures 2 and 3

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



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Fig. Fig. 3: 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.  

REMOVAL & INSTALLATION



Navajo

See Figures 4 and 5

  1. Disconnect the negative battery cable.
  2.  



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Fig. Fig. 4: 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. 5: ... 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.  

.

Pick-up and MPV Models

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

 
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