Mercedes M-Class W163

since 1997 release

Repair and operation of the car



Mercedes W163
+ Mercedes-Benz cars of a class M (W163)
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
+ Cooling systems, heating and air conditioner
+ A power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
- Automatic transmission
   Search of malfunctions - the general information
   The general principles of functioning of system transmission, the operating signals
   Adjustment of the drive of switching of AT
   Removal and installation of the electrohydraulic control unit of switchings
   Removal and the AT installation with the hydrotransformer
   Removal and installation of the selector module
   Removal and installation of a cable of blocking of the electronic switch of ignition (EIS)
+ Transmission line
+ Brake and auxiliary systems
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



The general principles of functioning of system transmission, the operating signals

General information

The scheme/design of an arrangement of the main components of an electronic control system of transmission and the ID card of plugs of the AT 13-contact socket are presented on illustrations.

Scheme of an arrangement of components of an electronic control system of AT

N15/3 — the Module of management of transmission (TCM)
S16/6 — the Sensor switch of activation of the kickdown mode

Y3/6 — Electric knot of the electrohydraulic control unit of switchings

Design of the electrohydraulic control unit of switchings

2a — the Hydraulic block
11 — the 13-contact socket
Y3/6 — the Electric control unit of switchings
Y3/6b1 — ATF temperature Sensor
Y3/6n2 — the Sensor of 2 turns
Y3/6n3 — the Sensor of 3 turns
Y3/6s3 — start blocking Contact

Y3/6y1 — Em the valve of management of modulations of pressure
Y3/6y2 — Em the valve of management of pressure of switchings
Y3/6y3 — Em the valve of management of switchings 1-2 and 4-5
Y3/6y4 — Em the valve of management of switching 3-4
Y3/6y5 — Em the valve of management of switching 2-3
Y3/6y6 — Em the ShIM valve of blocking of the hydrotransformer

Design of the selector module (without function of the consecutive choice of ranges, - release models till 31.08.99)

Card of identification of plugs of the 13-contact socket of the electrohydraulic control unit of switchings

1 — the Sensor of 3 turns (Y3/6n3)
2 — Э / the magnetic valve of adjustment of the modulating pressure (Y3/6y1)
3 — the Sensor of 2 turns (Y3/6n2)
4 — the Entrance signal of the sensor of temperature (Y3/6b1) and contact of blocking of a starter (Y3/6s1)
6 — Supply voltage э / magnetic valves
7 — sensor Supply voltage

8 — Э / the magnetic valve of gear shifting of 2-3 (Y3/6y5)
9 — Э / the magnetic valve of gear shifting of 3-4 (Y3/6y4)
10 — Э / the magnetic valve of adjustment of pressure of switching (Y3/6y2)
11 — Э / the magnetic valve (blocking of the converter of rotation) (Y3/6y6)
12 — the sensor Case
13 — Э / the magnetic valve of gear shifting of 1-2/4-5 (Y3/6y3)

TCM (N15/3) determines the current working parameters of the vehicle and exercises control of consecutive gear shifting, proceeding from simplicity of switching and parameters of the movement.

Activation of electromagnetic valves of switching is carried out at the command of the ETC (N15/3) control unit. The required size of pressure is calculated on the basis of the entering data and necessary adjustment adjustment of the transferred torque.

The processed parameters

Illustrative material by the principle of data exchange in a control system of AT it is presented on an illustration.

Entrance and output signals of the AT 722.6 control unit and tire of data exchange of CAN

N15/3 — TCM
X11/4 — the DLC Socket
Y3/6b1 — ATF temperature Sensor
Y3/6n2 — the RPM meter 2
Y3/6n3 — the RPM meter 3
Y3/6s3 — Contact of blocking of a starter
Y3/6u1 — the Electromagnetic valve of management of modulations of pressure
Y3/6u2 — Em the valve of management of pressure of switchings
Y3/6u3 — Em the valve of switchings 1-2 and 4-5
Y3/6u4 — Em the valve of switching 3-4

Y3/6u5 — Em the valve of switching 2-3
Y3/6u6 — Em the ShIM valve of blocking of the hydrotransformer
A1 — the Combination of devices
CAN — the Network tire of a motive compartment
N3/10 — ECM ME-SFI
N3/9 — ECM CDI
N15/3 — TCM
N15/5 — the Electronic selector module
N47 — the Module of management of the ETS traction control system
N73 — the Module of management of the electronic switch of ignition of EIS

ME-SFI (N3/10)/CDI control unit (N3/9)

  • The torque developed by the engine;
  • Gear shifting;
  • Emergency operation;
  • Functioning of a tempostat;
  • Activation of system of restriction of speed;
  • Functioning of a starter;
  • Activation of the kickdown mode;
  • Working parameters of the engine.

Electronic selector module (N15/5)

  • Position of the lever of the selector;
  • Sensor switch of the modes of transmission (S16/5);
  • Sensor switch of activation of the kickdown mode (S16/6).

ETS (N47) control unit

  • Frequency of rotation of wheels;
  • Torque of brake mechanisms;
  • Fact of squeezing of a pedal of a foot brake;
  • Condition of the parking brake.

EIS (N73) control unit

  • Condition of contact plugs;
  • Transmission option.

Combination of devices (A1)

  • Position of the lever of the selector / the chosen transfer.

ETS (N47) control unit

  • Transmission option;
  • Information on the chosen transfer.

ME-SFI (N3/10)/CDI control unit (N3/9)

  • The torque developed by the engine;
  • Emergency operation;
  • Activation of the mode of the movement;
  • Position of the lever of the P/N selector;
  • Sensor switch of the modes of transmission (S16/5);
  • Transmission option.