Component description for fully integrated transmission control unit - GF27.60-P-5165AHX

TRANSMISSION 722.930 up to 5/31/11, 722.931 as of 6/1/11 in MODEL 212.0/2 

Location 

The fully integrated transmission control unit (Y3/8n4) is integrated into the fully integrated transmission control controller unit (Y2/8), which is located at the bottom in the transmission in the oil pan.

View of fully integrated transmission control controller unit (Y3/8) from left front 

Task 

General 

With its own independent diagnosis system, the fully integrated transmission control unit determines the current operating state 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) using Xentry Diagnostics. The software required to program the control units is stored on the Star Diagnosis software DVD.

Controller Area Network (data bus/CAN bus) (CAN) 

The fully integrated transmission control unit is connected via the drive train CAN (CAN C) to the vehicle's CAN network, and exchanges data with other control units.

For vehicles up to facelift 13 

ME-SFI [ME] control unit (N3/10) acts as an interface between the drive train CAN and the chassis CAN (CAN E).

As of facelift 13 the current chassis CAN will be replaced by the chassis CAN 1 (CAN E1). An additional chassis CAN 2 (CAN E2) is used between the instrument cluster (A1) and the front SAM control unit with fuse and relay module (N10/1).

• 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
• Brake lights switch (S9/1), change of shift strategy, brake vehicle, transmission shifts down earlier
• ESP specified torque, torque reduction or torque increase

Steering column tube module control unit (N80) 

• Steering wheel downshift button (S110/1)
• Steering wheel upshift button (S111/1)

Front SAM control unit with fuse and relay module (N10/1) 

• Diagnosis request

ME-SFI [ME] control unit 

Requests for catalytic converter heating

Switching request

• Engine torque
• Engine coolant temperature
• Engine speed
• Engine load
• Kickdown

The ME-SFI [ME] control unit is the interface between the drive train CAN and the chassis CAN 1. The interface between the chassis CAN 1 and the chassis CAN 2 forms the front SAM control unit with fuse and relay module.

Input and output signals 

The following input signals are evaluated by the fully integrated transmission control unit and the appropriate output signals are generated:

• Direct input signals 
• Direct output signals 
• CAN input signals 
• CAN output signals 

Direct input signals 

• Circuit 31
• Circuit 87
• Wet clutch oil pressure sensor (Y3/8b1)
• Turbine wheel rpm sensor (Y3/8n1)
• Internal transmission rpm sensor (Y3/8n2)
• Output shaft rpm sensor (Y3/8n3)
• Selection range sensor (Y3/8s1)
• Transmission oil temperature sensor (Y3/8s2) (integrated into fully integrated transmission control unit)

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)
• Wet clutch control solenoid valve (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 of error storage
• Engine speed limitation active
• Limp-home mode engine control

Transmission oil auxiliary pump control unit (N89) (with code (B03) ECO start/stop function) 

• 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)

Premium Electronic Stability Program control unit 

• 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 

• Diagnostic data

Transmission oil auxiliary pump control unit (with code (B03) ECO start/stop function) 

• Specified value of on/off ratio (related specified current value)

ME-SFI [ME] control unit 

• 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 wet clutch actuation)
• Wet clutch status
• emergency operation transmission control

Premium Electronic Stability Program control unit (N30/7) 

Wiring diagram for fully integrated transmission control unit

PE27.19-P-2103-97DAA