EFI Main Relay (Non-Turbo)

The No. 1 EFI fuse supplies constant battery voltage to EFI main relay, located in engine compartment relay box. The EFI main relay is turned on by M-REL terminal of Engine Control Module (ECM). When EFI main relay is turned on, voltage is supplied to +B and +B1 terminals of ECM, data link connector, and +B terminal of fuel pump Electronic Control Unit (ECU). Fuel pump ECU is located in left rear corner of trunk. The ECM provides signals to fuel pump ECU for controlling fuel pump operation. Fuel pump ECU then provides voltage to the fuel pump.