Fuel Pump Relay: Description and Operation

Integrated Relay Control Module (IRCM):

When the ignition switch is turned ON, the Electronic Control Assembly (ECA) power relay is ENERGIZED, providing power to the fuel pump relay. Fuel pump power is provided through the fuel pump relay contacts and an inertia switch. If the ECA does not receive an ignition signal within approximately one second, a timer circuit in the Electronic Control Assembly (ECA) will open the ground circuit to the fuel pump relay, causing the fuel pump relay contacts to OPEN. This action stops the power supply to the fuel pump.
When the ignition switch is turned to the START position, the ECA closes the ground circuit to the fuel pump relay, resuming operation of the fuel pump. After the engine switch is returned to the ON position, power to the fuel pump is supplied through the fuel pump relay. If the ECA stops receiveing the ignition signal, the ECA will open the ground to the fuel pump relay, thereby interrupting power flow to the fuel pump.
The fuel pump relay and ECA power relay are located in the Integral Relay Control Module (IRCM).