Battery Signal (Supra Non-Turbo)

Battery voltage is always present at BATT terminal of Engine Control Module (ECM). When ignition is turned on, voltage for ECM operation is applied through EFI main relay to +B and +B2 terminals on ECM. EFI main relay may also be referred to as EFI relay. Voltage is applied to IGSW terminal on ECM through the IGN fuse.