Celica Coupe L4-132 2164cc 2.2L DOHC (5S-FE) (1992)
Circuit Opening Relay: Description and Operation
Circuit Opening Relay
With the absence of an Airflow Meter to control fuel pump operation after start-up, the ECU must keep the circuit open by sending a signal to the Circuit
Opening Relay. As long as the ECU senses ignition pulses, the relay will allow current to flow to the fuel pump. The relay, located in the passenger
compartment next to the ECU, inputs ground to the ECU through terminal FC.