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

Main Relay (System Relay)







The function of the main relay (system relay) is to supply certain components with voltage.

The relay is mechanical and has a closing function. In the rest position the circuit in the relay is open.

The main relay terminals (#30 and #86) are supplied with voltage by the battery. When the ignition key has been turned and the Engine Control Module (ECM) is powered, the terminal (#85) on the main relay is grounded by the Engine Control Module (ECM).

When the terminal (#85) is grounded, the relay is activated and a number of components are powered via the relay terminal (#87).

The engine control module (ECM) can diagnose the main relay.

The main relay is in the relay/fusebox in the engine compartment.