Component description for fully integrated transmission control unit - GF27.60-P-5165AHR
TRANSMISSION 722.931 in MODEL 218
View of fully integrated transmission control controller unit (Y3/8) from left front
Location
The fully integrated transmission control unit is integrated in the fully integrated transmission control controller unit which is located in the oil pan at the bottom of the transmission.
Task
General
With its own independent diagnosis system the fully integrated transmission control unit determines the current operating condition of the vehicle and controls all gear change sequences taking into account shift comfort and the driving situation.
Flash programming
The transmission control system in the fully integrated transmission control unit (VGS) is flash programmable i.e. the complete software in the control unit can be exchanged (replaced). The software required for control unit programming can be found on the STAR DIAGNOSIS update DVD.
Controller Area Network (data bus/CAN bus) (CAN)
The control unit for the fully integrated transmission control is connected via the drive train CAN (CAN C) to the vehicle's CAN network, and exchanges data with other control units.
The ME-SFI [ME] control unit (N3/10) serves as the interface between the drive train CAN and chassis CAN (CAN E).
Input and output signals
The following input signals are evaluated by the control unit for the fully integrated transmission control and the appropriate output signals are generated:
- Direct input signals
- Direct output signals
- CAN input signals
- CAN output signals
Direct input signals
- Circuit 31
- Terminal 87
- Oil pressure sensor for starting clutch (Y3/8b1)
- Turbine wheel rpm sensor (Y3/8n1)
- Internal transmission rpm sensor (Y3/8n2)
- Y3/8n3 Output shaft rpm sensor
- Selection range sensor (Y3/8s1)
- Transmission oil temperature sensor (Y3/8s2) (integrated into control unit for fully integrated transmission control)
Direct output signals
- Working pressure control solenoid valve (Y3/8y1)
- Clutch control solenoid valve K1 (Y3/8y2)
- Clutch control solenoid valve K2 (Y3/8y3)
- Clutch control solenoid valve K3 (Y3/8y4)
- Multidisk brake control solenoid valve B1 (Y3/8y5)
- Multidisk brake control solenoid valve B2 (Y3/8y6)
- Multidisk brake control solenoid valve B3 (Y3/8y7)
- Control solenoid valve for starting clutch (Y3/8y9)
CAN input signals
DIRECT SELECT INTERFACE (N150)
- Selector lever position
- Status of "P" button
Electronic ignition lock control unit (N73)
- "Enable" from drive authorization system stage 3 (DAS 3)
- Circuit -50 signal, influence on fault storage
Electronic Stability Program control unit (N30/4) (except code (233) DISTRONIC PLUS) or Electronic Stability Program Premium control unit(N30/7) (for code (233) DISTRONIC PLUS)
- Wheel speeds and direction of rotation, substitute values in the event of failure of the output shaft rpm sensor
- Adjusted braking torque, change of shift strategy, brake the vehicle, transmission shifts down earlier
- Vehicle lateral acceleration at center of gravity, adaptation of shift strategy, detection of dynamic driving style
- Cruise control operation, special shifting strategy
- Electronic Stability Program (ESP) request for shifting to "N", power flow interruption
- Stop lamp switch (S9/1), change of shift strategy, brake vehicle, transmission shifts down earlier
- ESP specified torque, torque reduction or torque increase
Steering column module control unit (N80)
- Downshift steering wheel gearshift button (S110/1)
- Upshift steering wheel gearshift button (S111/1)
Front SAM control unit with fuse and relay module (N10/1)
- Diagnosis request
ME-SFI [ME] control unit (N3/10)
- Requests for catalytic converter heating
- Switching request
- Engine torque
- Engine coolant temperature
- Engine speed
- Engine load
- Kickdown
- Engine speed limitation active
- Limp-home mode engine control
Transmission oil auxiliary pump control unitN89
- Actual value of on/off ratio (related actual current value)
- Diagnostic data
CAN output signals
Instrument cluster (A1)
- Transmission mode selection for transmission mode display (A1p16)
- Selector lever position and status of button "P" in gear indicator (A1p12)
- Actuation of indicator lamp for engine diagnosis (A1e58)
Electronic Stability Program control unit (except code (233) DISTRONIC PLUS) or Electronic Stability Program Premium control unit (with code (233) DISTRONIC PLUS)
- Wheel torque factor, overall gear ratio
- Actual gear, target gear
- Transmission variant, recognition of basic variants, difference in gear ratios
Front SAM control unit with fuse and relay module (N10/1)
- Diagnostic data
ME-SFI [ME] control unit (N3/10)
- Drive position
- Transmission mode
- Actual gear, target gear
- Engine torque reduction request
- Starter enable in selector lever position "P" or "N"
- Specified engine idle speed (for actuation of starting clutch)
- Starting clutch status
- Emergency transmission limp-home mode
Transmission oil auxiliary pump control unitN89
- Specified value of on/off ratio (related specified current value)
| Designation | Unit | Value | Tolerance range | Remarks | |
|---|---|---|---|---|---|
| Control unit for fully integrated transmission control (Y3/8n4) | |||||
| Power supply | VV | 13.5 | |||
| Voltage limit: | minimum maximum |
VV VV |
9.0 16.0 |
||
| Limited functionality: | minimum maximum |
VV VV |
5, 8 - 9, 0 16, 0 - 27, 0 |
||
| Power consumption: | maximum minimum |
mA A |
500 5 (temporarily 10) |
Quiescent current Operation |
|
| Short circuit current consumption: | maximum minimum |
A mA |
13 700 |
With a hydraulic valve at another pin | |
| Reverse polarity protection | VV | -16 | Yes | ||
| Operating temperature range | °C | -40 - 140 | |||
| Temperature profile | °C °C °C |
-40 - 100 100 - 130 130 - 140 |
90% of service life 9% of service life 1% of service life |
||
| Special features | Fault detection | ||||
| Flash capability/coding capability | Yes/yes | ||||
| Wiring diagram for fully integrated transmission control unit | Y3/8n4 | PE27.19-P-2103-97XAA |