Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car

Mercedes W202
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
+ 6. Heating, ventilation
- 7. System of ignition
   7.2. Safety measures at repair of electronic system of ignition
   7.3. Ignition coils
   + 7.4. Spark plugs
   - 7.5. Device of a preliminary warming up of the diesel
      + 7.5.1. Check of the device of a preliminary warming up
      7.5.2. Self-diagnostics of the device
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries

7.5.2. Self-diagnostics of the device


The power supply system of the diesel (EVE, ERE) regulated by means of electronics conducts the diagnosis independently, and accumulates the found malfunctions in memory of malfunctions. If there comes serious malfunction, then EDS – a signaling device on the dashboard flashes. (EDS – Electronic control of the diesel). In auto repair shop of Mercedes it is possible to interview malfunctions by means of the reading-out device and purposefully to eliminate them. Malfunction not necessarily arises because of bad road performance of the car. Therefore it is expedient to interview the saved-up malfunctions through certain intervals of a run.

Contents of memory of malfunctions remain even at shutdown of the rechargeable battery. The saved-up malfunctions automatically are erased if they are not observed during about 20 trips following one after another any more. Malfunctions which were remembered by the device can be extinguished manually by means of the device for reading of malfunctions.