Ignition Keyed Power
When the ignition switch is turned on, the ECM grounds the control circuit (coils) of the EFI main relay. This supplies battery power to the ECM. This circuit is also protected by the EFI fuse.
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.