Liberty Sport 2WD L4-2.4L VIN 1 (2002)
Crankshaft Position Sensor: Description and Operation
Fig.2 CKP Sensor Location - 2.4L
The Crankshaft Position (CKP) sensor is mounted into the right front side of the cylinder block. It is positioned and bolted into a machined hole.
Engine speed and crankshaft position are provided through the CKP (Crankshaft Position) sensor. The sensor generates pulses that are the input sent to
the Powertrain Control Module (PCM). The PCM interprets the sensor input to determine the crankshaft position. The PCM then uses this position,
along with other inputs, to determine injector sequence and ignition timing.
The sensor is a hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
Fig.4 CKP Operation - 2.4L
A tonewheel (targetwheel) is a part of the engine crankshaft. This tonewheel has sets of notches at its outer edge.
The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM.
