MPV L4-2606cc 2.6L SOHC (1989)
Fuel Pump Relay: Description and Operation
Fuel Pump Relay (Circuit Open Relay)
The fuel pump relay (circuit open relay), located beneath a panel under the passenger side footwell (next to the engine control unit), supplies power to
the fuel pump, when energized.
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 engine control unit. When the ECU receives a start signal from the ignition switch or a run signal from the ignition coil
negative terminal (tachometer signal), it grounds fuel pump relay terminal "Fc", energizing the relay.
