The Camshaft Position (CMP) sensor is found on late model diesel engines. The sensor is a Hall effect switch that generates a digital frequency while windows in a target wheel pass through its magnetic field, allowing the engine to detect engine speed and position. Refer to the component location illustration in this section for the sensor location.
- Turn the ignition key ON but do not start the engine.
- Using a high impedance Digital Volt Ohmmeter (DVOM), backprobe the CMP sensor's light blue wire with the negative lead and the dark green wire with the positive lead.
- Place the correct size socket on the crankshaft damper bolt, then use a breaker bar to turn the engine SLOWLY and observe the voltage reading.
- The voltage should fluctuate between 0 and 5 volts.
- If the voltage does not fluctuate, backprobe the brown wire with a white stripe with the positive lead of the DVOM and connect the negative lead to a good known ground. If the voltage is not 5 volts, check the wire for damage.
- Backprobe the brown wire with a white stripe with the positive lead of the DVOM and connect the negative lead to the light blue wire. If the voltage is not 5 volts, check the light blue wire for damage.
- If 5 volts is present at both the light blue and brown with white striped wires, the sensor may be defective.
REMOVAL & INSTALLATION
- Disconnect the camshaft position sensor wiring.
- Remove the bolt, then the camshaft position sensor.
- Install the CMP sensor and bolt in place.
- Engage the wiring connector.