DTC P0657 (PGM-FI System): General Description
Main CPU and driver ICs are built into the powertrain control module (PCM). The main CPU receives drive commands and driver IC drives each corresponding devices. Power for the main CPU is provided from +B VBUM(10A) line via CPU power supply, and power for the driver ICs are provided from IGP1 line via PGM-FI main relay 1. If the IGP1 voltage is a specified voltage for a specified time, the PCM detects a malfunction and stores a DTC.