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Home >> Toyota >> 1993 >> Tercel Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine Controls - Basic Testing - 4-CYL) >> Fuel System >> Fuel Pump Control Circuit >> EFI Main Relay
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EFI Main Relay

WARNING: This page is about a different car, the 1993 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

The EFI fuse supplies constant battery voltage to EFI main relay. The EFI main relay provides battery voltage to +B terminal of circuit opening relay (some models) and data link connector. Depending on model, EFI main relay may either be turned on directly by ignition switch or by M-REL terminal of Engine Control Module (ECM). The EFI main relay may also provide battery voltage to +B and +B1 terminals of ECM when ignition is turned on. The EFI main relay is located in engine compartment relay box.

NOTE: Circuit opening relay is used on all models.
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