DTC P2623: General Description
The fuel pressure is adjusted by high pressure fuel pump output ON/OFF which is controlled by the powertrain control module (PCM). In the PCM, the injector driver receives drive commands from the CPU and drives the high pressure fuel pump. The CPU monitors high pressure fuel pump currents and return signal from the injector driver to monitor a terminal voltage of PCM. If the monitored conditions are abnormal for a specified time, the PCM detects a malfunction and stores a DTC.