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

Sent by the fuel injection ECU:

PURPOSE
The [1][2]system relay provides current to the fuel pumps, idle air valve, mass air flow sensor, suppressor relay, oxygen sensor pre-heating resistor and to other ECU controlled functions or components.

LOCATION
Located in center console behind the ash-tray.

OPERATION
The fuel injection ECU controls the relay ground connection. When ground is supplied, the [1][2]system relay is activated and currant can flow to all the related components. If the ground connection is interrupted, no current can reach the components.