Component Description For Fully Integrated Transmission Control Unit - GF27.60-P-5165ANN

Transmission 722.9 05 in model 166 

as of model year 2016 

Transmission 722.9 05 in model 292 

View of fully integrated Transmission control controller unit (Y3/8) from above 

Courtesy of MERCEDES-BENZ USA

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.

Tasks 

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 is stored on the diagnosis software DVD.

CAN bus 

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

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 

• Terminal 31
• Circuit 87 (switched circuit 15)
• Turbine wheel rpm sensor (Y3/8n1)
• Internal Transmission speed rpm sensor (Y3/8n2) (on model 166) or internal input speed rpm sensor (Y3/8n2) (on model 292)
• 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)
• Torque converter lockup clutch control solenoid valve (Y3/8y8)

CAN input signals 

Intelligent servo module for DIRECT SELECT (A80): 

• Position of range selector lever

Electronic ignition lock control unit (N73): 

• Release of drive authorization system stage 4 (FBS4)
• "Key-P function" request
• Circuit 50 signal, influencing fault storage

Electronic Stability Program control unit (N30/4): 

• Wheel speeds and direction of rotation, substitute values in the event of failure of the output shaft rpm sensor
• Set 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®) requested shift into "N", interruption of power flow
• Status of service brake, change of shift strategy, braking the vehicle, earlier Transmission downshifts.
• ESP® specified torque, torque reduction or torque increase

Steering column tube module control unit (N80): 

• Steering wheel downshift button signal (S110/1)
• Steering wheel upshift button signal (S111/1)
• DIRECT SELECT lever signal (S1613)

ME-SFI control unit (N3/10): 

• Requests for catalytic converter heating
• Shift request
• Engine torque
• Engine coolant temperature
• Engine speed
• Engine load
• Kickdown
• Rpm limitation ACTIVE
• Engine management limp-home mode

SAM control unit (N10): 

• Diagnosis request
• Position of Transmission mode control (N72/4s1)
• DSR request

Transmission oil auxiliary pump control unit (N89): 

• Actual value of on/off ratio (related actual current value)
• Diagnostic data

Trailer recognition control unit (N28/1) (with CODE 550 (Trailer hitch)): 

• Trailer recognition signal

CAN output signals 

Instrument cluster (A1): 

• Selector lever position for gear indicator (A1p12)
• Multifunction display (A1 p 13)
• Actuation of engine diagnosis indicator lamp (A1e58)

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

SAM control unit: 

• Diagnostic data

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"
• Engine idle target engine speed (for actuation of the torque converter lockup clutch)
• Status of torque converter lockup clutch
• Transmission limp-home mode

Transmission oil auxiliary pump control unit: 

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

Wiring diagram for fully integrated Transmission control unit

PE27.19-P-2103-97NBC