626 1999-2001

Camshaft Position Sensor

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Operation



Specific to:

Mazda 626 1998-2002

The Camshaft Position (CMP) Sensor is a permanent magnet output coil device that operates within a 5 volt DC reference range, and monitors the speed and position of the camshaft. A reluctor is attached directly to the camshaft, and is used to generate a digital signal as it passes the magnetic coil; the alternating lines of magnetic flux are used by the sensor to produce a digital pulse. The CMP signal is used by the Powertrain Control Module (PCM) to calculate ignition timing, firing order, fuel injector timing, and misfire diagnostics.

Removal & Installation



2.5L V6 (KL) Engine
  1. Disconnect the battery negative cable.
  2.  
  3. Disconnect the camshaft position sensor connector.
  4.  
  5. Remove the timing belt cover and timing belt. See -Timing Belt- in -ENGINE MECHANICAL- section.
  6.  
  7. Remove the cylinder head cover.
  8.  
  9. Hold the camshaft using a wrench on the cast hexagon, and loosen the camshaft pulley lock bolt.
  10.  
  11. Remove the camshaft timing pulley lock bolt.
  12.  
  13. Remove the camshaft timing pulley.
  14.  
  15. Remove the CMP sensor.

    Click image to see an enlarged view

    Fig. Removing the camshaft pulley and CMP sensor

  16.  

To install:

  1. Installation is the CMP sensor and tighten the sensor bolt to 70-95 inch lbs. (8-10 Nm).
  2.  
  3. Install the camshaft timing pulley and tighten the pulley bolt to 91-103 ft. lbs. (123-140 Nm), while counter-holding the camshaft with a wrench on the cast hexagon.
  4.  
  5. Install the cylinder head cover.
  6.  
  7. Install the timing belt and cover. See -Timing Belt- in -ENGINE MECHANICAL- section.
  8.  
  9. Connect the CMP sensor connector.
  10.  
  11. Connect the battery cable.
  12.  

Testing



Specific to:

Mazda 626 1999-2002

  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter. Standard value: 550 ohms
  4.  
  5. If not within specification, check wiring harness and connectors between CMP sensor and PCM.
  6.  
  7. If within specifications, replace the sensor.

    Click image to see an enlarged view

    Fig. Testing the CMP sensor

  8.  

2.0L 4-Cylinder (FS) Engine

Specific to:

Mazda 626 1998-2002

  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter.
  4.  
  5. If not within 0.95-1.25 k-ohms, check related wiring harness.
  6.  
  7. If okay, replace the camshaft position sensor.

    Click image to see an enlarged view

    Fig. Remove the CMP sensor connector and measure resistance

  8.  

2.5L V6 (KL) Engine

Specific to:

Mazda 626 1998-2002

  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter.
  4.  
  5. If resistance is not approximately 550 ohms, check related wiring harness.
  6.  
  7. If okay, replace the camshaft position sensor.

    Click image to see an enlarged view

    Fig. Remove the CMP sensor connector and measure resistance

  8.  

 
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