Camshaft Position Sensor: Description and Operation

Camshaft Sensor:

PURPOSE
In a Sequential Electronic Fuel Injection (SEFI) system each individual fuel injector is energized just prior to the opening of its corresponding intake valve. The Camshaft Position (CMP) sensor is used to identify when number 1 cylinder is on compression stroke and to generate the Cylinder Identification (CID) signal. This CID signal allows the Powertrain Control Module (PCM) to sequence the fuel injectors in the correct order.

CONSTRUCTION
CMP is a single hall effect magnetic switch, activated by a single vane which is driven by the camshaft.

PIP and CMP Signal Comparison:

OPERATION
The camshaft drives a single vane hall effect switch, As the vane passes through the hall effect switch it creates a square wave signal which alternates between battery voltage and 0.0 volts.

RELATED DIAGNOSTIC TROUBLE CODES

DTC 214 - Cylinder Identification (CID) circuit failure.