Circuit Opening Relay

Fuel Pump Electrical Circuit - Run Stage:

Circuit Opening Relay:

Purpose:
The circuit opening relay provides power to the fuel pump.

Construction:
The relay consists of a single set of contacts controlled by two separate coils.

Operation:
One coil is energized when the key is turned to the start position. The relay contacts close and power is supplied to the fuel pump for starting. Once the ECM begins to receive pulses from the engine rpm sensor it grounds the other coil which continues to hold the contacts closed after the key is released to the run position.

Location:
The relay is located behind the center console attached to the ECM.