RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Camshaft Position Sensor: Description and Operation
Fig. 6 CMP / Pulse Ring - 5.9L
The CMP sensor on the 5.9L V-8 engine contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal
generator detects a rotating pulse ring (shutter) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator. Its signal is
used in conjuction with the Crankshaft Position (CKP) Sensor to differentiate between fuel injection and spark events. It is also used t synchronize the
fuel injectors with their respective cylinders.
When the leading edge of the pulse ring (shutter) enters the sync signal generator, the following occurs: the interruption of magnetic field causes the
voltage to switch high resulting in a sync signal of approximately 5 volts.
When the trailing edge of the pulse ring (shutter) leaves the sync signal generator, the following occurs: the change of the magnetic field causes the sync
signal voltage to switch low to 0 volts.
