RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
Camshaft Position Sensor: Description and Operation
Fig. 4 Camshaft Position Sensor (CMP) Location
The three-wire Camshaft Position Sensor (CMP) is located below the fuel injection pump. It is attached to the back of the timing gear cover housing.
The Camshaft Position Sensor (CMP) performs multiple functions. One function is to detect engine speed (rpm). Another function is to relate crankshaft
position and Top Dead Center (TDC) of the number 1 cylinder. Because the CMP is now used to relate crankshaft position, the Crankshaft Position
Sensor (CKP) is no longer used.
Fig. 6 Camshaft Position Sensor (CMP)
The CMP contains a hall effect device called a sync signal generator to generate a sync signal.
The CMP uses three wires (circuits) for operation. One wire supplies a 5-volt signal from the Engine Control Module (ECM). Another wire supplies a
sensor ground. The third wire supplies a signal back to the ECM relating engine speed and crankshaft position.
