lexus Workshop Repair Guides

Lexus Workshop Service and Repair Manuals

Sensors and Switches - Computers and Control Systems > < Main Relay (Computer/Fuel System)|Locations
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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.

Sensors and Switches - Computers and Control Systems > < Main Relay (Computer/Fuel System)|Locations