Civic L4-1.8L (2006)
Main Relay (Computer/Fuel System): Description and Operation
PGM-FI Main Relay 1 and 2
PGM-FI main relay 1 (C) is energized whenever the ignition switch is ON (II) to supply battery voltage to the ECM/PCM, power to the injectors, and
power for PGM-FI main relay 2 (FUEL PUMP). PGM-FI main relay 2 (FUEL PUMP) is energized to supply power to the fuel pump for 2 seconds when
the ignition switch is turned ON (II), and when the engine is cranking or running.
