Friday, February 24, 2012

Testing Camshaft Position Sensor?

The details are as follows :-----

Camshaft Position (CMP) Sensor


Perform the following checks before getting into more complicated diagnosis and repair.

Some faults in the CMP circuit can be the result of secondary ignition components leaking high voltage into the ignition module. Check for incorrect harness routing too near secondary ignition components. Examine the ignition coils for signs of coil arcing to the wiring harness or to the ICM. Check the coils for cracks, carbon tracking or other signs of damage. Check the secondary wiring (spark plug wires) for arcing to the wiring harness.
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.
Inspect for a faulty coil.
Inspect for poor connections. Check the PCM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals and poor terminal-to-wire connection.
Look for a damaged harness or damaged wiring going to the CMP sensor, especially if heavy work has recently been done where the connector could have been damaged.

The best method to test this sensor is with the use of an oscilloscope.

  1. Visually check the connector, making sure it is connected properly and all of the terminals are straight, tight and free of corrosion.
  2. With the ignition in the ON position, check the sensor voltage using an oscilloscope. When the starter is briefly operated, a square wave pattern, alternating from 0-12 volts should be seen at terminal A. If the voltage is within specification, the sensor is functional.

This will help.

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