Main Relay (Computer/Fuel System): Description and Operation

PURPOSE
The Main Relay serves as a source of battery power for several components including the Circuit Opening Relay, (which powers the Fuel Pump), and the Engine Control Module (ECM).

OPERATION
The main relay is energized by a signal from the ignition switch. It then supplies battery current from the Electronic Fuel Injection (EFI) fuse to the ECM and other components.