Tercel Sedan 4-Door L4-1456cc 1.5L SOHC (3E) (1994)
Circuit Opening Relay: Description and Operation
Circuit Opening Relay Schematic
PURPOSE
The circuit opening relay provides power to the fuel pump.
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 Electronic Control Module (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.
CONSTRUCTION
The relay consists of a single set of contacts controlled by two separate coils.