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Home >> Toyota >> 1992 >> Corolla Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 4-CYL >> Fuel System >> Fuel Pump Control Circuit >> EFI Main Relay
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EFI Main Relay

  1. The EFI fuse supplies constant battery voltage to EFI main relay. EFI main relay provides battery voltage to +B terminal of circuit opening relay and engine check connector.
  2. Depending on model, EFI main relay may either be turned on directly by ignition switch or by M-REL terminal of Electronic Control Unit (ECU).
  3. Fuel pump should operate with jumper wire between +B and FP terminals of engine check connector and ignition on. If fuel pump does not operate, check EFI main relay and wiring circuit. See I - SYS/COMP TESTS article in this section for testing of EFI main relay. See WIRING DIAGRAMS article in this section for wiring circuit.
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