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Main Relay (Computer/Fuel System): Description and Operation

EFI Main Relay Schematic:

PURPOSE
The EFI main relay controls the ECU power supply.

LOCATION
Located in the relay box on the left side of the engine compartment.

OPERATION
When the ignition switch is turned to the ON position, the relay coil is energized. When powered the relay contacts close, sending battery voltage to ECU terminals +B and +B1.