Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car

Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling systems, heating
+ Power supply system and release
- Engine electric equipment
   - Systems of ignition and engine management - the general information
      Checks of a control system of ignition and injection
      Search of malfunctions - the general information and preliminary checks
      Check and adjustment of a corner of an advancing of ignition
      Spark plugs
      Self-diagnostics of systems of electronic control of OBD
      Diagnostics of electronic system of the automatic air conditioner (AC)
      Application of an oscillograph for observation of signals of a control system
      Ignition coils - installation details
      Removal, installation and adjustment of the sensor of position of the camshaft (CMP)
      The distributor of ignition (M119.97 engines) - installation details
   + Systems of a charge and start
+ Gear shifting box
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Diagnostics of electronic system of the automatic air conditioner (AC)

Diagnostic codes besides the special scanner can be schitana from the display of the Quarter control unit. Codes of malfunctions remain even at shutdown of the rechargeable battery.

Reading of codes


1. Include ignition;
2. Transfer handles of the choice of temperature to provisions of HI left and LO right;
3. During 20 sec. after the translation of handles at the same time press and hold the REST and EC buttons during 5 sec.;
4. The light-emitting diode of the RECIRCULATION key will begin to blink and on the display OFF will appear
5. Press the right AUTO button more than 1 sec. If malfunctions in memory are not recorded, in the left part of the display there will be E, and in the right FF. Otherwise in the left part Ebl, and in right - a malfunction code is displayed (address the list of the KV codes);
6. For a conclusion of a code of the following malfunction press the AUTO button;
7. For deleting of codes after their full reading press the right and left AUTO buttons more than 2 sec. In the left part of the display d, in the right FF is displayed;
8. When pressing the right AUTO button there is a restoration of the erased codes (compare to the codes which are written down earlier);
9. After removal of codes in the left part of the display E, in the right FF is displayed;
10. Install the handle of the choice of temperature in normal situation;
11. Switch off ignition.