Description & Operation
The Camshaft Position sensor (CMP) is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders. The sensor generates electrical pulses. These pulses (signals) are sent to the Powertrain Control Module (PCM). The PCM will then determine crankshaft position from both the camshaft position sensor and crankshaft position sensor.
The tonewheel is located at the front of the camshaft. As the tonewheel rotates, notches pass through the sync signal generator.
When the cam gear is rotating, the sensor will detect the notches. Input voltage from the sensor to the PCM will then switch from a low (approximately 0.3 volts) to a high (approximately 5 volts). When the sensor detects a notch has passed, the input voltage switches back low to approximately 0.3 volts.
Removal & Installation
2.7L & 3.5L Engines
- Disconnect negative battery cable.
- Unlock and disconnect electrical connector.
- Remove the mounting bolt.
- Remove the Camshaft Position Sensor (CMP).
- Install the CMP sensor.
- Install the mounting bolt.
- Tighten CMP mounting bolt to 105 inch lbs. (12 Nm).
- Connect the electrical connector and lock.
- Connect negative battery cable.
- Disconnect the electrical connector at CMP sensor.
- Remove the CMP sensor mounting bolt.
- Carefully twist sensor from timing chain cover.
- Check condition of the sensor O-ring.
- Clean out the machined hole in the timing chain cover.
- Apply a small amount of engine oil to sensor o-ring.
Install the CMP sensor into timing chain cover with a slight rocking action. Do not twist sensor into position as damage to o-ring may result.
WARNINGBefore tightening sensor mounting bolt, be sure sensor is completely flush to timing chain cover. If sensor is not flush, damage to sensor mounting tang may result.
- Install mounting bolt and tighten to 105 inch lbs. (12 Nm).
- Connect the electrical connector to sensor.
2.7L, 3.5L & 5.7L Engines
- Disconnect the CMP Sensor connector.
- Ignition on, engine not running.
- Measure the voltage on the (F856) 5-volt Supply circuit in the CMP harness connector.
If the voltage is not between 4.5-5.2 volts. Repair the open or short to ground in the (F856) 5-volt Supply circuit.