Protege L4-1839cc 1.8L DOHC (1990)
Fuel Pump Relay: Description and Operation
The Circuit Opening Relay, located under the right kick panel adjacent to the ECU, is an ECU controlled component of the fuel system. When the
airflow meter flap moves in response to incoming air induced by engine cranking, it closes a switch which energizes the relay. The relay in turn supplies
operating voltage to the electric fuel pump. As a safety feature, the relay is only energized when the engine is running or being cranked by the starter
motor.