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Home >> Lexus >> 1993 >> SC 300 Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> EFI Main Relay
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EFI Main Relay

EFI main relay supplies battery voltage to terminals +B and +B1 of ECM. The EFI fuse supplies constant battery voltage to EFI main relay.

NOTE: Components are grouped into 2 categories. The first category covers INPUT DEVICES, which control or produce voltage signals monitored by the control unit. The second category covers OUTPUT SIGNALS, which are components controlled by the control unit.
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