lexus Workshop Repair Guides

Lexus Workshop Service and Repair Manuals

Fuel Pump Relay|Testing and Inspection > < Fuel Pump Relay
Page 1
background image

Fuel Pump Relay: Description and Operation
Circuit Opening Relay

Circuit Opening Relay Schematic

PURPOSE

The circuit opening relay provides power to the fuel pump.

LOCATION

Mounted to the ECU behind the right side of the dash.

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 ECU 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. 

Fuel Pump Relay|Testing and Inspection > < Fuel Pump Relay