RX7 2RTR- 1308cc 1.3L Turbo FI (1989)
Fuel Pump Relay: Description and Operation
Fuel Pump Relay (Circuit Open Relay)
The fuel pump relay (circuit open relay), located above the steering shaft inside the steering column cover, supplies power to the fuel pump.
The relay has two separate hold in coils, one for starting (cranking) and one for running. During engine cranking, current flows through the start coil to
ground, energizing the relay. The run coil gets power from both the start signal and the "IGN" terminal of the ignition switch, at relay terminal "B".
Voltage is present at this terminal when the key is in either the "start" or "run" position. The run coil, however, does not energize until the circuit is
completed to ground by the ECU. When an "engine run" signal is present from the ignition system, the ECU completes the circuit to ground, energizing
the fuel pump relay.
