EFI Main Relay

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

Fig 1: Locating Engine Performance Components (ES250)

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Fig 2: Locating Engine Performance Components (LS400)

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.