Left Hand Drive

Camshaft Position Sensor:

PURPOSE
The camshaft position (CMP) sensor signal 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.

OPERATION
The CMP sensor contains a hall effect device called a sync signal generator to generate a field sync signal.
The CMP sensor detects a rotating pulse ring (shutter) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator.
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.

NOTE: If the Powertrain Control Module (PCM) does not sense input from the CMP sensor, the PCM will deactivate automatic shut down and fuel pump relays, interrupting voltage to fuel pump, fuel injectors, and ignition coil, causing a no start condition.

CIRCUIT OPERATION
The Powertrain Control Module (PCM) supplies 8 Volts to the camshaft position sensor (in distributor) on circuit K7 Circuit K7 connects to cavity 7 of the PCM.

The PCM receives the camshaft position sensor signal on circuit K44. Circuit K44 connects to cavity 44 of the PCM.

The PCM provides a ground for the camshaft position sensor signal (circuit K44) through circuit K4. Circuit K4 connects to cavity 4 of the PCM.