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

Main Relay Schematic:

The main relay contains two individual relays, one of which operates the fuel pump. It is located behind the passenger seat to the left of the ECU.
The first relay is energized when the ignition is turned ON and supplies current to the ECU, the injectors, and the second relay.
The second relay supplies current to the fuel pump through a fuel pump relay/fuel pump resistor. The voltage path is determined by the ECU. The second relay is energized for two seconds when the ignition is switched ON and continues to supply current while the engine is running. If the engine stalls, current to the fuel pump is switched OFF.