Ascender 2WD L6-4.2L (2003)
Crankshaft Position Sensor: Description and Operation
Crankshaft Position (CKP) Sensor
The crankshaft position (CKP) sensor is a permanent magnet generator, known as a variable reluctance sensor. The magnetic field of the sensor is altered
by a crankshaft mounted reluctor wheel that has seven machined slots, six of which are equally spaced 60 degrees apart. The seventh slot is spaced 10
degrees after one of the 60 degree slots.
The CKP sensor produces seven pulses for each revolution of the crankshaft. The pulse from the 10 degree slot is known as the sync pulse. The sync
pulse is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is connected to the PCM by a signal circuit and a low
reference circuit.