Nissan Maxima 1993-1998 Repair Guide

Camshaft Position Sensor

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OPERATION



The Camshaft Position (CMP) sensor is a basic component of the engine control system. It monitors engine speed and piston position. These input signals to the ECM are used to control fuel injection, ignition timing and other functions.

TESTING



VG30E Engines

See Figures 1 and 2



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Fig. Fig. 1: The camshaft position sensor is located within the distributor on VG30E engines



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Fig. Fig. 2: Inspect the signal plate for damage or debris

  1. Remove the distributor assembly from the engine.
  2.  
  3. Disconnect the ignition wires and coil wire from the distributor.
  4.  

The camshaft position sensor electrical harness should remain connected.

  1. Turn the ignition switch ON .
  2.  
  3. Measure voltage between terminals 3, 4 and ground.
  4.  
  5. With the engine's distributor shaft rotating slowly, voltage should fluctuate between 0 and 5 volts.
  6.  

If the voltage signal is checked with the engine running, the normal reading will be 2.3 volts (average voltage). An oscilloscope may also be used to view the pulse signal.

  1. If voltage does not fluctuate or is not within specification, check the circuits for damage.
  2.  
  3. If the circuits are functional, the sensor may be faulty.
  4.  
  5. Install the distributor and connect the ignition and coil wires.
  6.  

VE30DE engines

See Figures 3 through 11



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Fig. Fig. 3: Backprobe each terminal and check for voltage while rotating the sensor by hand

  1. Mark the position of the sensor on the cylinder head so the timing is not altered when it is installed.
  2.  
  3. To remove the sensor from the engine, removing the two adjustment screws and pull the sensor out of the cylinder head.
  4.  



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Fig. Fig. 4: After the position of the sensor is marked, remove the adjustment bolts ...



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Fig. Fig. 5: ... then pull the sensor out of the cylinder head



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Fig. Fig. 6: Use a small wire to backprobe terminals A and B

  1. Disconnect the power transistor.
  2.  
  3. Turn the ignition switch to the ON position.
  4.  
  5. Backprobe the harness connector at terminal A and ground.
  6.  
  7. While turning the distributor by hand, the voltage should fluctuate between 0 and 5 volts.
  8.  



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Fig. Fig. 7: When turning the sensor by hand, the voltage should fluctuate between 0 and 5 volts

  1. Backprobe the harness connector at terminal B and ground.
  2.  


WARNING
Do not bridge terminals A and B together while checking for sensor function. Check each terminal separately.

  1. While turning the distributor by hand, the voltage should fluctuate between 0 and 5 volts.
  2.  
  3. If the sensor does not respond to the test as described, the sensor may be faulty.
  4.  



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Fig. Fig. 8: To inspect the signal plate, remove the cover screws ...



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Fig. Fig. 9: ... then lift the cover off of the sensor. Inspect the signal plate for debris or damage

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