Electronically controlled diesel power supply system (EVE, ERE) carries out the diagnosis independently, and accumulates the detected malfunctions in the memory of malfunctions. If a serious malfunction occurs, then the EDC flashes - a signaling device on the dashboard. (EDS - Electronic Diesel Control). In a Mercedes workshop, faults can be interrogated using a reading device and rectified in a targeted manner. The malfunction does not necessarily occur due to poor driving performance of the vehicle. Therefore, it is advisable to interrogate the accumulated faults at certain intervals of the run.
The contents of the fault memory are retained even when the battery is disconnected. Accumulated faults are automatically erased if they are no longer observed for about 20 consecutive trips. Faults stored in the instrument can be cleared manually using the fault reader.