Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car



Mercedes-Benz
+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
- Automatic transmission
   Specifications
   + The automated box of gear shifting 716.6
   - Automatic transmission 722.6
      Search of malfunctions - the general information
      Problems of the block of electronic control and the operating signals
      Removal and the AT installation with the hydrotransformer
      The AT electrohydraulic control unit (AT is established)
      Dismantling and assembly of the electrohydraulic control unit
      Dismantling and assembly of a plate of gear shifting
      Case of transmission and hydrotransformer
      Multidisk brakes of B2, B3 and gear wheel of blocking at "Parking"
      Dismantling and assembly of a back hollow shaft with the back coupling of a free wheeling
      Removal and installation of a multidisk brake B1 and oil pump
      Dismantling and assembly of the oil pump
      Dismantling and assembly of a multidisk brake of B1
      Dismantling and assembly of a multidisk brake of B2
      Dismantling and assembly of an output shaft with the central and back block of planetary gear wheels
      Removal and installation of multidisk couplings K1, K2 and K3
      Dismantling and assembly of coupling of K1
      Dismantling and assembly of the leading shaft with coupling by K2 and the forward block of planetary gear wheels
      Dismantling and assembly of coupling of K3
      The blocking mechanism at "parking"
      Removal and installation of the lever of the selector of gear shifting
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment







Problems of the block of electronic control and the operating signals

Control unit of automatic transmission

K38 — the Module of the relay of blocking of a starter
N2/2 — the SRS Control unit
N15/1 — the Control unit of 5-staged AT (TCM)
N15/3 — the Control unit of transmission (TCM)
N54 — the RCL Control unit

Purpose of contacts of the 13-contact socket of transmission

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)
5 —
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)

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

N15/3 — the ETC Control unit
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 — the Electromagnetic valve switchings
Y3/6u3 — the Electromagnetic valve of switchings 1-2 and 4-5
Y3/6u4 — the Electromagnetic valve of switching 3-4
Y3/6u5 — the Electromagnetic valve of switching 2-3
Y3/6u6 — the Electromagnetic PWM valve of blocking of the hydrotransformer
A1 — the Control panel
CAN — the Tire of a motive compartment
N3/10 — the ME-SFI [ME] Control unit
N15/3 — the ETC Control unit
N15/5 — the Control unit of the electronic lever of switching
N47 — the traction control system Control unit
N73 — the EIS Control unit

Tasks

The ETC (N15/3) control unit 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.

Is exposed to processing the following data arriving from other systems:

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 (as on models 01.06.02)
· Working parameters of the engine.

Control unit of the electronic lever of switching (N15/5)

· Position of the lever;
· Sensor switch of the modes of transmission (S16/5);
· Sensor switch of activation of the kickdown mode (S16/6) (till 31.05.02)

Control unit of the traction control system (N47)

· 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 [EZS] control unit (N73)

· Condition of contact plugs;
· Transmission option.

Control panel (A1)

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

Control unit of the traction control system (N47)

· 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.