Sync Signal Generator

The sync signal generator is located in the distributor and references the position of pistons No. 1 and No. 6. The sync signal works in conjunction with the engine speed sensor to provide the ECU with inputs to establish and maintain correct injector firing order.

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 the leading edge of the pulse ring enters the sync signal generator, the change of magnetic field induces a voltage rise resulting in a sync signal of 5.0 volts. This indicates to the ECU that the piston No. 1 will be the next piston at TDC. 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 zero (0) volts. This indicates to the ECU that piston No. 6 will be the next piston at TDC.