RAM 1500 Truck 2WD V6-3.7L VIN K (2003)
Camshaft Position Sensor: Description and Operation
CAMSHAFT POSITION SENSOR
The Camshaft Position Sensor (CMP) on this engine is bolted to the right-front side of the right cylinder head.
Fig.6 CMP Operation - 3.7L V-6
The Camshaft Position Sensor (CMP) sensor on this engine contains a hall effect device referred to as a sync signal generator. A rotating target wheel
(tonewheel) for the CMP is located at the front of the camshaft for the right cylinder head. This sync signal generator detects notches located on a
tonewheel. As the tonewheel rotates, the notches pass through the sync signal generator. The signal from the CMP sensor is used in conjunction with
the Crankshaft Position Sensor (CKP) to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with
their respective cylinders.
When the leading edge of the tonewheel notch enters the tip of the CMP, 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 tonewheel notch leaves then tip of the CMP, the change of the magnetic field causes the sync signal voltage to switch
low to 0 volts.
