Camshaft Position (CMP) Sensor
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 sensor signal to select the correct ignition coil to fire.
Inline engines with 2 camshaft and VCT are equipped with 2 CMP sensors. The second sensor identifies the exhaust camshaft position.
The 2 sensor system on inline engines use the following CMP sensor signal circuit names:
- CMP11 - bank 1, sensor 1 (intake camshaft)
- CMP12 - bank 1, sensor 2 (exhaust camshaft)