DTC P0403: EGR Control Circuit: Description

To judge if there is an open circuit in the EGR solenoid drive circuit, ECM (M/T) or PCM (A/T) measures the surge voltage of the EGR solenoid coil. The ECM (M/T) or PCM (A/T) drives the EGR solenoid. After the solenoid is turned off, the ECM (M/T) or PCM (A/T) will check if the solenoid coil produces a surge voltage of 2 volts or more.