F 250 4WD Super Duty V10-6.8L VIN Z CNG (2003)
Crankshaft Position Sensor: Description and Operation
CRANKSHAFT POSITION SENSOR
Crankshaft Position (CKP) Sensor
The crankshaft position (CKP) sensor (Figure 56) is a magnetic transducer mounted on the engine block adjacent to a pulse wheel located on the
crankshaft. By monitoring the crankshaft mounted pulse wheel, the CKP is the primary sensor for ignition information to the PCM. The pulse wheel
has a total of 35 teeth spaced 10 degrees apart with one empty space for a missing tooth. The 6.8L ten cylinder pulse wheel has 39 teeth spaced 9
degrees apart and one 9 degree empty space for a missing tooth. By monitoring the pulse wheel, the CKP sensor signal indicates crankshaft position
and speed information to the PCM. By monitoring the missing tooth, the CKP sensor is also able to identify piston travel in order to synchronize the
ignition system and provide a way of tracking the angular position of the crankshaft relative to a fixed reference (Figure 54) for the CKP sensor
configuration. The PCM also uses the CKP signal to determine if a misfire has occurred by measuring rapid decelerations between teeth.
