Mystique L4-122 2.0L DOHC VIN 3 SFI (1995)
Crankshaft Position Sensor: Description and Operation
PURPOSE
The Crankshaft Position (CKP) sensor provides base timing and engine speed information to the Ignition Control Module (ICM). The ICM
supplies this information to the Powertrain Control Module (PCM) as the Profile Ignition Pickup (PIP) signal. The PCM uses this information for
fuel injector timing and calculating ignition timing advance and dwell.
CONSTRUCTION
The CKP is a variable reluctance type sensor that monitors the movement of a 35 tooth wheel located on the flywheel.
OPERATION
As the teeth on the flywheel pass by the CKP a voltage is induced in the sensor. The CKP output is a spiked sine wave that is proportional to
crankshaft speed and position. The missing tooth (36 minus 1) design allows the ICM to synchronize the signal and select the correct coil to fire.
