DTC P0418 Mercedes-Benz

Description

The diagnostic trouble code will be set under the cases below: 1). The solenoid valve is not energized even after ASC-ECU has turned on the valve relay (Open circuit is present in the power supply circuit to the ASC-ECU solenoid valve, or the valve relay has failed). 2). The solenoid valve is not activated even after ASC-ECU has turned on the valve relay (Open circuit is present in the solenoid valve circuit in ASC-ECU, or the valve relay has failed). 3). After ASC-ECU has turned off the driving transistor, the solenoid valve still remains energized (short in the solenoid valve circuit). 4). When a solenoid valve failure is detected.