Genuine Nissan Quest Camshaft Position Sensor

Nissan Quest Camshaft Position Sensor Parts Questions & Experts Answers

• Magnet Sensor Assembly
  23731-1B000
  Q: How to test and replace a camshaft position (CMP) sensor on Nissan Quest?

  A:

  If the tests show that the sensor is working well and is not responsible for introducing a driveability problem or an OTC, the wiring harness and the connectors between the sensor and the PCM should be scanned for any opens or shorts. If there is no abnormality, it is recommended to take the car to a dealer service department or a competent repair workshop. There is the camshaft position (CMP) sensor, which targets at monitoring engine speed or position of the pistons and passing information to the computer, which in turn helps to control the duration of fuel injection and ignition timing. Namely, the sensor has a 360 slit rotor plate for each degree that gives a one percent signal and six slits for the 120-degree camshaft position signal. LED and photo diodes together are installed in the wave forming circuit; the rotor plate blocks the light beam in such a way that it sends on-off pulses to the ECM. To test, remove the distributor/CMP sensor connector, attach the positive earth end of a voltmeter across it to the B+ terminal of the harness connector then brought the negative end to the sensor connector ground terminal. Start by turning the key to the ON position without starting the engine the voltmeter should display above 10 volts or near battery voltage. Following the OFF state of the ignition, take out the distributor from the engine; reconnect the distributor connector and back probe the CMP sensor signal and grounds with the voltmeter. While the vehicle ignition is on, turn the distributor shaft slowly, then, the voltage should oscillate between the high of 0 volts to the low of 5 volts, and it should move through the ammeter six times per revolution testing the 120-degree signal. Next, back probe the CMP sensor reference and ground terminals, while with the ignition on back turn the distributor shaft again while observing and checking the 1-degree signal from the sensor to fluctuate between 0 volts to 5 volts, 360 times in one full turn. If no pulsating voltage signal is recorded at the Co-MP sensor even if battery voltage is detected, then the sensor is considered as being faulty; this means that the distributor has to be replaced since the CMP sensor is embedded therein.