Function of transmission control - GF27.60-P-2002PMA

TRANSMISSION 722.6 in MODEL 203, 209, 211, 230 with CODE (428a) Steering wheel shift buttons 

Transmission control is divided into the functions of electronic transmission control (ETC) and hydraulic transmission control. While the EGS takes over the gear selection and adaptation of pressures to the torque to be transmitted, the power supply control of transmission 722.6 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 significant improvement in shift quality.

The ETC offers the advantage of a flexible adaptation to various vehicle and engine versions.

The driver can choose between 3 transmission modes "S" (sport program), "C" (comfort program) and "M" (manual program). These also provide different gear ratios for reverse gear.

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

The ETC takes place as a function of:

• The vehicle speed
• The position of the selector lever
• Accelerator pedal position
• Program selection ("M/C/S")
• Programmed shift range
• Selected gear (with program selection "M")
• 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
  	Location/task/design/function of starter interlock contact		GF27.19-P-5106G
  	Temperature sensor, location/task/design/ function		GF27.19-P-5108G
  	Location/task/function of rpm sensor		GF27.19-P-5127G
  	Location/task/design/function of oil pump		GF27.10-P-5103G