Crankshaft Position Sensor: Description and Operation

PURPOSE
The Crankshaft Position Sensor (CKPS) is a basic component of the Electronic Concentrated Engine Control System (ECCS). It monitors engine speed and piston position, and sends signals to the Engine Control Module (ECM) to control fuel injection, ignition timing and other functions.

Crankshaft Position Sensor:

Crankshaft Position Sensor Rotor Plate:

CONSTRUCTION
The Crankshaft Position Sensor has a rotor plate and a wave- forming circuit. The rotor plate has 360 slits for 1 signal and 8 slits for 90 signal. Light Emitting Diodes (LED) and photo diodes are built in the wave-forming circuit

OPERATION
When the rotor plate passes between the LED and the photo diode, the slits in the rotor plate continually cut the light being transmitted to the photo diode from the LED This generates rough-shaped pulses which are converted into on-off pulses by the wave-forming circuit, which are sent to the ECM.

CKPS Diagnostic Trouble Code (DTC): No. 11.