Celica L4-132 2164cc 2.2L DOHC (5S-FE) (1993)
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Circuit Opening Relay: Description and Operation
Circuit Opening Relay
PURPOSE
The circuit opening relay provides power to the fuel pump.
LOCATION
The relay is located behind the center console next to the ECU.
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.
