HOLDEN GEN III V8, Service Training

Page: 35 / 113

GEN III V8 ENGINE MANAGEMENT
CRANKSHAFT POSITION SENSOR
The Crankshaft Position Sensor (CKP) is mounted
in the right rear of the engine block behind the
starter. The CKP sensor works in conjunction with
a 24X reluctor wheel mounted on the rear of the
crankshaft. The CKP sensor has a battery power
supply, an earth, and a signal circuit.
As the crankshaft rotates, the reluctor wheel teeth
interrupt a magnetic field produced by a magnet
within the sensor. The sensor's internal circuitry
detects this and produces a signal which the PCM
reads. The PCM uses this signal to accurately
measure crankshaft position and engine speed.
The reluctor wheel is mounted on the rear of the
crankshaft. The 24X reluctor wheel use two
different width notches (12° and 3°) that are 15°
apart. This pulse width encoded pattern allows
cylinder position identification within 90 degrees of
crankshaft rotation. In some cases, cylinder
identification can be located in 45 degrees of
crankshaft rotation. This reluctor wheel also has
dual track notches that are out of phase. The dual
track design allows for quicker starts and accuracy.
NOTE: The engine will not run if the PCM does not receive a CKP signal. With no CKP signal,
the PCM will not issue any injector pulses.
Page - 30 GEN III V8 ENGINE MANAGEMENT