See Figures 1 and 2
The camshaft position sensor (along with the crankshaft position sensor) provides inputs to the PCM to determine fuel injection synchronization and cylinder identification. From these inputs, the PCM determines crankshaft position.
On 4-cylinder engines, the camshaft position sensor mounts to the rear of the cylinder head. The sensor also serves as a thrust plate to control end-play of the camshaft.
The 6-cylinder engines are equipped with a camshaft driven mechanical distributor, which is equipped with an internal camshaft position (fuel sync) sensor.
See Figures 3, 4, 5 and 6
To test this sensor, you will need the use of an oscilloscope.
Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion.
The output voltage of a properly operating camshaft position sensor switches from high (5.0 volts) to low (0.3 volts). By connecting an oscilloscope to the sensor output circuit, you can view the square wave pattern produced by the voltage swing.
REMOVAL & INSTALLATION
See Figures 7 and 8
- Disconnect the negative battery cable.
- Remove the air cleaner/inlet duct assembly from the vehicle.
- For SOHC engines, detach the electrical connectors from the engine coolant sensor and the camshaft position sensor.
- For DOHC engines, unplug the electrical connector from the camshaft position sensor.
- For SOHC engines, remove the brake booster hose and the electrical connectors form the holders on the end of the cylinder head cover.
- Unfasten the camshaft position sensor mounting screws, then remove the sensor.
- Loosen the screw/bolt attaching the target magnet to the rear of the camshaft.
The target magnet has 2 locating dowels which fit into the machined locating holes in the end of the camshaft.
- Install the target magnet in the end of the camshaft. Tighten the retainer to 30 inch lbs. (3.4 Nm).
- Install the camshaft position sensor. Tighten the sensor mounting screws to 80 inch lbs. (9 Nm).
- For SOHC engines, place the brake booster hose and electrical harness in the holders on the end of the valve cover.
- Carefully attach the electrical connector(s) to the camshaft position sensor and coolant temperature sensor (if necessary). Be careful, since installation at any angle may damage the pins.
- Install the air cleaner/inlet duct assembly.
- Connect the negative battery cable.
The 2.5L engines are equipped with a distributor unit containing an integral camshaft position sensor. If the camshaft position sensor fails, the distributor assembly must be replaced. For distributor service, refer to Engine Electrical