gf2760p2002pm

Function of transmission control

Type gf · topic 27.60 · version 0101 · 2008-04-08

Applies to: TRANSMISSION 722.6 in MODEL 203 (except 203.02 /05 /076 /22 /25 /276) as of 24.4.04 except CODE (428) Steering wheel shift buttons up to Model Year 8

Where it sits

Function group 2 Chassis › 27 Automatic transmission › 27.60 Gearshift, control — Series 203 (models 004, 006, 007, 008, 016, 018, 035, 040, 042, 043, 045, 046, 061, 064, 065, 081, 084, 087, 092, 204, 206, 207, 208, 216, 218, 235, 240, 242, 243, 245, 246, 261, 264, 265, 281, 284, 287, 292, 706, 707, 708, 718, 730, 731, 735, 740, 741, 742, 743, 745, 746, 747, 752, 756, 764)

Also applies to engines/gearboxes: 722 6**

GF27.60-P-2002PM

Function of transmission control

14.12.03

TRANSMISSION 722.6 in MODEL 203 (except 203.02 /05 /076 /22 /25 /276) as of 24.4.04
except CODE (428) Steering wheel shift buttons
up to Model Year 8

Transmission control is divided into the functions of electronic transmission control (ETC) and hydraulic transmission control.

Whilst the electronic transmission control (ETC) takes over gear selection and the adaptation of pressures to the torque to be transmitted, the power supply control of the automatic transmission takes place via the hydraulic elements of the electrohydraulic control unit. The oil supply to the hydraulic elements, such as the hydrodynamic torque converter, the shift elements and the hydraulic transmission control, is provided by way of an oil pump connected with the torque converter.

-----------------------------------------------------------------------------------------

The electronic transmission control (ETC) makes possible a precise adaptation of pressures to the respective operating conditions and to the engine output during the gearshift phase, resulting in a considerable improvement in shift quality. The engine speed limit can be reached in the individual gears at full throttle and kickdown.

The shift range can be changed in the forwards gears while driving, however the ETC prevents an unacceptably high engine speed by means of a downshift lockout device

-----------------------------------------------------------------------------------------

Furthermore ETC offers the advantage of a flexible adaptation to various vehicle and engine versions. The driver can choose between the two transmission modes "S" (sport program) and "C" (comfort program). These also provide different gear ratios for reverse gear.

The ETC [EGS] control unit (N15/3) monitors and shifts depending on:

The vehicle speed

The position of the selector lever

Accelerator pedal position

Program selection ("C/S")

The state of the transmission

Controller Area Network (CAN) signals

ETC control unit, location/task

GF27.19-P-4012G

Electric control unit, location/task/design/function

GF27.19-P-5104G

Starter lockout contact, location/task/design/function

GF27.19-P-5106G

Temperature sensor, location/task/design/function

GF27.19-P-5108G

Speed sensor, location/task/function

GF27.19-P-5127G

Location / task / design / function of oil pump

GF27.10-P-5103G

Referenced documents