Civic L4-1668cc 1.7L SOHC MFI (2003)
Main Relay (Computer/Fuel System): Description and Operation
PGM-FI Main Relay 1 and 2
The PGM-FI relay consists of two separate relays. PGM-FI main relay 1 is energized whenever the ignition switch is ON (II) which supplies battery
voltage to ECM/PCM, power to the injectors, and power for PGM-FI main relay 2. PGM-FI main relay 2 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 running.
