Ignition Hall Effect Sensor: Description and Operation

Camshaft Position Sensor:

LOCATION

The sync signal generator is located in the distributor housing under the ignition rotor and pulse ring.


PURPOSE

The sync signal generator works in conjunction with the engine speed sensor to provide engine controller with inputs. This is done to establish and maintain correct injector firing order.


OPERATION

The sync signal generator consists of a pulse ring mounted to the distributor shaft and a sync signal generator. The sync signal generator is a Hall Effect switch. The pulse ring rotates 180 degrees through the sync signal generator.

When leading edge of pulse ring enters sync signal generator, the change of magnetic field induces a voltage rise. This will result in a sync signal of 5 volts.

When the trailing edge of the pulse ring leaves the sync signal generator, the change of the magnetic field causes the sync signal voltage to drop to 0 volts.

The sync signal input and speed sensor input allow the engine controller to establish the necessary reference point to synchronize injection.