GF27.10-P-0001-06AHT Automatic Transmission (AT), Transmission Modes

GF27.10-P-0001-06AHT Automatic Transmission (AT), Transmission Modes
- TRANSMISSION 722.931 in MODEL 221.074/174, 216.374





Illustration shows instrument cluster (A1), model 221

1 - 7 Stage
A1p12 Gear display
A1p13 Multifunction display
A1p16 Transmission mode display

C Comfort transmission mode
D Drive position
M Manual transmission mode
H Sport transmission mode

Gear indicator in instrument cluster in Sport transmission mode "S" and Comfort transmission mode "C"

It shows the driver the shift range currently selected "1, 2, 3, 4, 5, 6" or selector lever position "D, R, N, P".

Gear indicator in instrument cluster in transmission mode Manual "M"

It shows the driver the engaged gear "1, 2, 3, 4, 5, 6, 7" or selector lever position "R, N, P".

Transmission mode display in instrument cluster

It indicates to the driver which program was selected using the transmission modes button (A40/9s8): Sport "S", Comfort "C" or Manual "M".

The data come via the drive train CAN (CAN C) from the fully integrated transmission control unit (VGS) (Y3/8n4) and are forwarded by the ME-SFI [ME] control unit (N3/10) via the chassis CAN (CAN E) to the central gateway control unit (N93). The central gateway control unit places the signal on the central CAN (CAN F) to the instrument cluster, which actuates the transmission mode display.

The ME-SFI [ME] control unit is the interface between the drive train CAN and the chassis CAN.

The central gateway control unit is the interface between the chassis CAN and the central CAN.

Four different functions can be selected using the DIRECT SELECT gear selector switch (S16/13) and three different transmission modes using the transmission modes button.

Selector lever positions

"P" Park lock and start position
"R" Reverse gear
"N" Neutral and start position (no power transmission, vehicle can move freely)
"D" Drive (all 7 forward gears are available)

Upshifting and downshifting

Upshifting and downshifting take place via the steering wheel gear shifter PLUS (S111/1) and steering wheel gear shifter MINUS (S110/1).

Press +: Upshift by one gear at a time. The shift range is expanded simultaneously in transmission modes "C" and "S". Press and hold: Direct change to gear range "D".

Press -: Downshift by one gear at a time. The shift range is limited simultaneously in transmission modes "C" and "S". Press and hold: The transmission changes into a shift range from which the vehicle can be accelerated or slowed down favorably.

If the shift range is restricted, upshifts occur close to the engine cutoff speed.





View of center console, model 221

A40/9s8 Transmission modes button

Transmission modes button

The following transmission modes can be selected:

Comfort transmission mode "C"

Starting off always in 2nd gear except in 1st gear range. The gear changes take place at lower engine speed.

Sport transmission mode "S"

Starting off in 1st gear for all driving situations.

Manual transmission mode "M"

Direct gear selection by means of the steering wheel gear shifter MINUS and steering wheel gear shifter PLUS.

When kickdown is actuated the upshifts and downshifts take place as in transmission mode Sport "S".