PGM-FI Main Relays 1 and 2
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
PGM-FI main relay 1 is energized whenever the ignition switch is turned to ON (II) to supply battery voltage to the 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 control module for 2 seconds when the ignition switch is turned to ON (II), and when the engine is cranking or running.