Camshaft Position Sensor: Description and Operation

Typical Hall-Effect Sensor:

CONSTRUCTION
There are two two types of Camshaft Position (CMP) sensors, the hall-effect type and the variable reluctance sensor.


PURPOSE
The Camshaft Position (CMP) sensor detects the position of the camshaft.

OPERATION
The CMP sensor identifies when piston No.1 is on its compression stroke. A signal is sent to the Powertrain Control Module (PCM) and used for synchronizing the firing order of the sequential fuel injectors.

The input circuit to the PCM is referred to as the CMP input or circuit.