Cylinder Identification Sensor: Description and Operation

CID/CKP Sensor:

DESCRIPTION
The Cylinder Identification (CID) sensor detects Number 1 cylinder when it reaches Top Dead Center (TDC) and signals the Powertrain Control Module (PCM) to control fuel injection.

OPERATION
A single vane rotor cap is mounted to the distributor shaft, below the crankshaft position rotor cap, where it spins according to the camshaft speed. As it rotates through a magnetic Hall effect pickup switch, the sensor detects the opening on the rotor cap and sends an input signal to the PCM.