Sequentronic automated manual transmission (SEQ), function - GF26.00-P-0002A

TRANSMISSION 716.6 in MODEL 203, 230 with CODE (424) Sequentronic automated manual transmission (SEQ) up to Model Year 08/modification year 07 

TRANSMISSION 716.6 in MODEL 208, 209, 211 with CODE (424) Sequentronic automated manual transmission (SEQ) 

Fig 1: Identifying Sequentronic Automated Manual Transmission Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function 

The "Sequentronic" automated manual transmission is a system which automatically triggers gear changes and automatically actuates the clutch. This explains the absence of a clutch pedal. The drive train elements (clutch and manual transmission) are actuated with power assistance and mutually coordinated by means of a higher level control system.

The shift request is initiated by the driver using the touch shift. Because of the actuating power requirements and the highly restricted installation conditions in the tunnel area, the Sequentronic system is supplied with hydraulic energy. This energy is produced by a hydraulic pump and supplied to the actuators (hydraulic elements) via the hydraulic controller unit.

All components except for the ECU and the central shift mechanism are installed either in or on the base transmission unit.

The enhanced-convenience manual transmission consists of the following components:

• 6-speed manual transmission 716.6 (1)
• Sequential floor shift
• Hydraulic controller unit (3)
• Hydraulic pump (4)
• Hydraulic pressure reservoir (2)
• Gear recognition sensor (B56/1)
• Hydraulic oil reservoir (5)
• Hydraulic central clutch operator with integral clutch travel sensor (8)
• Automated manual transmission control unit (/)N15/6