DTC P0685: Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Control Circuit Malfunction: General Description

If something is wrong in the engine control module (ECM)/powertrain control module (PCM) that causes the PGM-FI main relay (FI MAIN) to turn OFF before the ignition switch is turned OFF, the ECM/PCM detects a malfunction and a DTC is stored.