DTC P2401, P2402: General Description
The EVAP leak check module vacuum pump is installed in the EVAP leak check module to create negative pressure in the EVAP passage when performing the EVAP leak check. The vacuum pump is normally non-energized and inactive. It is only activated when performing the EVAP leak check. The powertrain control module (PCM) detects a malfunction and stores a DTC when the diagnostic signal of the driver IC of the PCM internal circuit is low continuously for the prescribed time though operation signal is output to the EVAP leak check module vacuum pump.