Wrangler L4-2.5L VIN P (1999)
Crankshaft Position Sensor: Description and Operation
CRANKSHAFT POSITION SENSOR-PCM INPUT
This sensor is a hall effect device that detects notches in the flywheel (manual transmission) or flexplate (automatic transmission).
This sensor is used to indicate to the Powertrain Control Module (PCM) that a spark and or fuel injection event is to be required. The output from
this sensor, in conjunction with the camshaft position sensor signal, is used to differentiate between fuel injection and spark events.
SYSTEM OPERATION
Crankshaft Position Sensor - Auto Trans
Crankshaft Position Sensor - Manual Trans
The crankshaft position sensor is mounted to the transmission bellhousing at the left/rear side of the engine block.
Engine speed and crankshaft position are provided through the 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.
Sensor operation
