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Main Relay (Computer/Fuel System): Description and Operation
MFI Main Relay:
PURPOSE The MFI main relay controls the ECM 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 ECM powers the relay coil through terminal M-REL. When powered the relay contacts close, sending battery voltage to ECM terminals +B and +B1.
