Description & Operation
The CMP sensor detects the position of the camshaft. The CMP sensor identifies when piston number 1 is on its compression stroke. A signal is then sent to the PCM and used for synchronizing the sequential firing of the fuel injectors. Coil-on-plug (COP) ignition applications use the CMP signal to select the correct ignition coil to fire.
Removal & Installation
- Disconnect the negative battery cable.
- Disconnect the CMP sensor electrical connector.
- Remove the bolt and the CMP sensor.
- Installation is the reverse of removal.
The camshaft position sensor (CMP) on the 3.0L DOHC and 3.4L DOHC engines is a variable reluctance sensor that is triggered by a high point on the left-hand exhaust camshaft sprocket. The CMP sends a signal relating camshaft position back to the PCM which is used by the PCM to control engine timing.
The camshaft position sensor (CMP) on the 3.0L OHV engine is a single hall-effect magnetic switch that is triggered by a single vane which is driven by the camshaft. The CMP sends a signal relating camshaft position back to the PCM which is used by the PCM to control engine timing.
- Check voltage between the camshaft position sensor terminals PWR GND and CID.
- With engine running, voltage should be greater than 0.1 volt AC and vary with engine speed.
- If voltage is not within specification, check for proper voltage at the VPWR terminal.
- If VPWR voltage is greater than 10.5 volts, sensor may be faulty.