Description & Operation
The Camshaft Position Sensor (CMP) on the 4.7L V8 engine is bolted to the front/top of the right cylinder head. The CMP sensor contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects notches located on a tone wheel. The tone wheel is located at the front of the camshaft for the right cylinder head. As the tone wheel rotates, the notches pass through the sync signal generator. The pattern of the notches (viewed counter-clockwise from front of engine) is: 1 notch, 2 notches, 3 notches, 3 notches, 2 notches 1 notch, 3 notches and 1 notch. The signal from the CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.Exc. 4.7L
The Camshaft Position (CMP) sensor is located in the distributor. The sensor 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 conjunction with the Crankshaft Position (CKP) sensor 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 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.
Removal & Installation
The Camshaft Position Sensor (CMP) on the 4.7L V8 engine is bolted to the front/top of the right cylinder head.
NOTEIt is easier to remove/install sensor from under vehicle.
- Raise and support vehicle.
- Disconnect electrical connector at CMP sensor.
- Remove sensor mounting bolt.
- Carefully twist sensor from cylinder head.
- Check condition of sensor O-ring.
- The Camshaft Position Sensor (CMP) on the 4.7L V8 engine is bolted to the front/top of the right cylinder head.
- Clean out machined hole in cylinder head.
- Apply a small amount of engine oil to sensor O-ring.
Install sensor into cylinder head with a slight rocking action. Do not twist sensor into position as damage to O-ring may result.
WARNINGBefore tightening sensor mounting bolt, be sure sensor is completely flush to cylinder head. If sensor is not flush, damage to sensor mounting tang may result.
- Install mounting bolt and tighten to 12 Nm (106 inch lbs.) torque.
- Connect electrical connector to sensor.
The camshaft position sensor is located in the distributor on all 2.5/3.9/5.2/5.9L engines.
NOTEDistributor removal is not necessary to remove camshaft position sensor.
- Remove air cleaner assembly.
- Disconnect negative cable from battery.
- Remove distributor cap from distributor (two screws).
- Disconnect camshaft position sensor wiring harness from main engine wiring harness.
- Remove distributor rotor from distributor shaft.
- Lift the camshaft position sensor assembly from the distributor housing.
- Install camshaft position sensor to distributor. Align sensor into notch on distributor housing.
- Connect wiring harness.
- Install rotor.
- Install distributor cap. Tighten mounting screws.
Install air cleaner assembly.