Automatic transmission (AT), function - GF27.10-P-0001GZ: Notes
TRANSMISSION 722.9 in MODEL 164.1
TRANSMISSION 722.9 in MODEL 164.8
Networking of components, shown: model 164.175 with engine 113, except code (430) Offroad package
Fig 2: Identifying Automatic Transmission (AT) Networking Of Components - Shown Model 164.175 With Engine 113
Transmission 722.9 is an electronically controlled automatic transmission with 7 forward gears and 2 reverse gears. All the transmission functions and transmission components for this automatic transmission are combined in one assembly module. Integrating the electrohydraulic controller unit in transmission 722.9 minimizes the number of interfaces to the wiring harness. The electrohydraulic controller unit is installed below the transmission housing; the transmission oil is continuously flushed around the outside of the controller unit, which amongst other things, ensures the controller unit is cooled.
Transmission 722.9 can be roughly divided into the following component groups:
- Torque converter with torsional damper and torque converter lockup clutch.
- Oil pump to produce the necessary oil pressure and for reliable lubrication of the actuators and bearing points.
- Transmission housing with transmission mechanism and the electrohydraulic controller unit. The transmission housing is made of a light alloy.
- The mechanical transmission components, consisting of a Ravigneaux gear set, front single planetary gear set, rear single planetary gear set and a park pawl. Additionally, a multi-disk clutch K1, multi-disk clutch K2, multi-disk clutch K3, multi-disk brake B1, multi-disk brake B2, multi-disk brake B3 and the BR multi-disk brake are also integrated. Single-sided disks are used on multidisk clutch K1, on multidisk clutch K2 and on multidisk clutch K3 Single-sided disks are also used on multidisk brake B1 and on multidisk brake B3 On this type the friction lining is only applied on one side. Among other things, this improves heat distribution in the disk pack, the design of the disk pack is more compact, the load bearing capacity is increased and the mass is reduced. For the multi-disk brake B2 and BR multi-disk brake disks coated on both sides are also used.
- Electrohydraulic controller unit consisting of the electric controller unit VGS (Y3/8), valve body and valve housing.
The following information are taken into account when shifting the drive positions:
- Vehicle speed
- Vehicle load
- Driving resistance
- Position and operating speed of accelerator pedal
- Selected drive position and engaged gear
- Selected transmission mode
- Oil temperature and other information about the status of the transmission
- Further signals which are available via the Controller Area Network bus class C (engine compartment) (CAN-C)
Data is exchanged with the following control units via CAN-C:
- Instrument cluster
- Intelligent servo module for DIRECT SELECT
- CDI control unit (N3/9)
- ME control unit
- ESP control unit
- Upper control panel control unit
- EIS [EZS] control unit
- Steering column module
- Central gateway control unit
This involves the processing of the following data from other systems:
Intelligent servo module for DIRECT SELECT
- Actual position of selection range lever
CDI control unit (with engine 629, with engine 642)
- Start-off in 1st gear, aids engine warm-up
- Shift line displacement, aids engine warm-up
- Shift line displacement, dependent on load condition of diesel particulate filter (DPF), a heavily loaded DPF results in slightly lower upshift speed for full-load and kick-down upshifts
- Kickdown
- Specified gear, lower and upper limit, aids engine warm-up
- Emergency operation of the common rail diesel injection, the pedal value is limited to approx. 20 %, the driveability of the vehicle is assured
- Tempomat regulates, a special shift strategy for Tempomat mode is stored in the fully integrated transmission control (VGS) control unit (up to 31.5.05)
- Engine coolant temperature, used as substitute value in event of malfunction in transmission oil temperature sensor (VGS) (Y3/8s2)
- Engine oil temperature, shift limitation is canceled
- Requirement torque for Electronic Stability Program (Electronic-Stability-Program) (ESP), torque reduction or torque increase taking into account directional stability and road adhesion
- Request for torque converter lockup clutch "OPEN" to increase the engine speed in the warm-up phase of the engine
- Pedal value
- Engine torque
- Engine idle specified speed for the actuation of the torque converter lockup clutch
- Engine-speed limitation function active, adaptations are deactivated in the fully integrated transmission control (VGS) control unit
- Engine speed, for slip calculation of torque converter lockup clutch and for start of pressure calculation by fully integrated transmission control (VGS) control unit
ME-SFI [ME] control unit (except engine 629, except engine 642)
- Active downshift for heating up the catalytic converter (TWC)
- Shift line displacement to heat up the catalytic converter
- Specified gear, lower and upper limit to heat up the catalytic converter
- Emergency operation of the ME fuel injection and ignition system (motor electronics) (ME), the pedal value is limited to approx. 20 %, the driveability of the vehicle is assured
- Start-up in 1st gear for warming up catalytic converter
- Tempomat regulates, a special shift strategy for Tempomat mode is stored in the fully integrated transmission control (VGS) control unit (up to 31.5.05)
- Engine coolant temperature, used as substitute value in event of malfunction in transmission oil temperature sensor (VGS)
- Engine oil temperature, shift limitation is canceled
- Selected torque ESP, torque reduction or increase taking directional stability and road adhesion into account
- Request "Torque converter lockup clutch OPEN" to increase the engine speed in the warm-up phase of the engine
- Engine idle specified speed for the actuation of the torque converter lockup clutch
- Engine speed, for slip calculation of torque converter lockup clutch and for start of pressure calculation by fully integrated transmission control (VGS) control unit
- Engine-speed limitation function active, adaptations are deactivated in the fully integrated transmission control (VGS) control unit
- Engine torque
- Kickdown
- Pedal value
ESP control unit
- BAS release switch (A7/7s1), change of shift strategy, brake the vehicle, the fully integrated transmission control (VGS) shifts down earlier
- Set brake torque, change of shift strategy, brake the vehicle, the fully integrated transmission control (VGS) shifts down earlier
- Wheel speeds and direction of rotation, substitute values in event of malfunction of output speed sensor (VGS) (Y3/8n3)
- ESP request shift into "N" (neutral), power flow interruption, transmission/rear axle
- Vehicle lateral acceleration at center of gravity, adaptation of shift strategy, detection of dynamic driving style
- Cruise control controls, a special shifting strategy for cruise control mode is filed in the fully integrated transmission control (VGS) control unit as of 1.6.05)
Upper control panel control unit
- Offroad program switch, offroad program activated or deactivated, on model 164.120/122/128/175/186 except code (430) Offroad package
- Transmission modes switch (N72/1s32), on model 164.120/122/128/175/186 with code (430) Offroad package, except code (494) USA version, on model 164.177, on model 164.822/828/871/886 except code (494) USA version
Only the sport program "S" available on model 164.120/122/128/175/186 with code (430) Offroad package and with code (494) USA version and on model 164.822/828/871/886 with code (494) USA version.
EIS [EZS] control unit
- Refrigerant compressor (A9) ON
- Circuit 50, influencing fault memory
- Torque requirement of refrigerant compressor, torque correction
Steering column module
- Signal from left steering wheel gear shifter (S110/2), except model 164.177
- Signal from right steering wheel gear shifter (S111/2), except model 164.177
- Signal from steering wheel gear shifter MINUS (S110/1), on model 164.177
- Signal from steering wheel gear shifter PLUS (S111/1), on model 164.177
- Signal from DIRECT SELECT gear selector switch (S16/13)
Central gateway control unit
- Diagnosis
The following information is passed to other systems:
Instrument cluster
- Gear selector switch position for multifunction display (A1p13)
- Transmission mode selection for multifunction display
- Pre-selected shift range for multifunction display
Intelligent servo module for DIRECT SELECT
- Driver selected gear selector position
- Actual position of transmission
- Specified position of selection range lever
CDI control unit (with engine 629, with engine 642)
- Engine torque requests, engine intervention when shifting
- Starter lockout release in selector lever position "P", "N"
- Transmission variant, recognition of basic variants, difference in gear ratios
- Actual gear and target gear, gear engaged, gear to be shifted, can be shown using STAR DIAGNOSIS
- Limp-home of fully integrated transmission control (VGS)
- Status of torque converter lockup clutch
- Transmission oil temperature, actuation of transmission oil cooler circulation pump (M13/7) and actuation of engine and air conditioning electric suction fan with integrated control (M4/7) in combination with engine 642
ME-SFI [ME] control unit (except engine 629, except engine 642)
- Engine torque requests, engine intervention when shifting
- Limp-home of fully integrated transmission control (VGS)
- Starter lockout release in gear selector switch position "P", "N"
- Status of torque converter lockup clutch
- Actual gear and target gear, gear engaged, gear to be shifted, can be shown using STAR DIAGNOSIS
- Transmission variant, recognition of basic variants, difference in gear ratios
ESP control unit
- Wheel torque factor, overall gear ratio
- Transmission variant, recognition of basic variants, difference in gear ratios
- Actual gear and target gear, gear engaged, gear to be shifted, can be shown using STAR DIAGNOSIS
EIS [EZS] control unit
- Gear selector switch position for actuation of backup lamp function
Central gateway control unit
- Gear selector switch position for actuation of backup lamp function
- Diagnosis
| Automatic transmission (AT), location of mechanical parts | GF27.10-P-0001-07GZ | |
| Automatic transmission (AT), location of electric/electronic components | GF27.10-P-0001-08GZ | |
| Automatic transmission (AT), location of hydraulic components | GF27.10-P-0001-09GZ | |
| Automatic transmission (AT), location of shift mechanism components | GF27.10-P-0001-17GZ | |
| Automatic transmission (AT), gear selector switch positions | Model 164.120/122/128/175/186 except code (430) Offroad package | GF27.10-P-0001-18GZ |
| Model 164.120/122/128/175/186 with code (430) Offroad package, except code (494) USA version Model 164.822/828/871/886 except code (494) USA version |
GF27.10-P-0001-18GZO | |
| Model 164.120/122/128/175/186 with code (430) Offroad package, with code (494) USA version Model 164.822/828/871/886 with code (494) USA version |
GF27.10-P-0001-18GZU | |
| Model 164.177 | GF27.10-P-0001-18RT | |
| Automatic transmission (AT), driver information | Model 164.120/122/128/175/186 except code (430) Offroad package | GF27.10-P-0001-02GZ |
| Model 164.120/122/128/175/186 with code (430) Offroad package, except code (494) USA version Model 164.822/828/871/886 except code (494) USA version |
GF27.10-P-0001-02GZO | |
| Model 164.120/122/128/175/186 with code (430) Offroad package, with code (494) USA version Model 164.822/828/871/886 with code (494) USA version |
GF27.10-P-0001-02GZU | |
| Model 164.177 | GF27.10-P-0001-02GZA | |
| Automatic transmission (AT), features | GF27.10-P-0001-14GZ | |
| Automatic transmission (AT), gear ratios | Model 164.120/122/128/175/186 except code (430) Offroad package | GF27.10-P-0001-01GZ |
| Model 164.120/122/128/175/186 with code (430) Offroad package Model 164.822/828/ 871/886 |
GF27.10-P-0001-01GZO | |
| Model 164.177 | GF27.10-P-0001-01SX | |
| Automatic transmission (AT), updating the transmission control unit by flash-updating | GF27.10-P-0001-15GZ | |
| Power flow, function | GF27.10-P-2009GZ | |
| Gear shift, function | GF27.60-P-2000GZ | |
| Transmission control, function | GF27.60-P-2002GZ | |
| Kick-down, function | GF27.10-P-2010GZ | |
| Key-P function | GF27.10-P-3028GZ |