(Component Description For Fully Integrated Transmission Control Unit - GF27.60-P-5165AHA)

Transmission 722.9 in MODEL 166 

up to model year 2016 

View of fully integrated Transmission controller unit (Y3/8) from above, shown with fully integrated Transmission control 4 (VGS4-0, as of year model 12) 

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.

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 to program the control units is stored on the diagnostic system software DVD.

CAN bus 

The fully integrated Transmission control unit is connected via drive train CAN (CAN C) to the vehicle's CAN network, 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 

• Circuit 31
• Circuit 87 (switched circuit 15)
• 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)
• 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): 

• Drive authorization system (DAS) enable
• "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
• 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) desired shift into "N", power flow interruption
• Brake light 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 signal (S110/1)
• Steering wheel upshift button signal (S111/1)
• DIRECT SELECT lever signal (S1613)

CDI control unit (N3/9) or ME-SFI [ME] control unit (N3/10): 

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

SAM control unit (N10): 

• Diagnosis request
• Position of off-road package Transmission mode control (N72/3s1) (with CODE 430 (On & Offroad package))
• Off-road program request (with engine 157/276/278/642 and engine 651 with CODE 498 (Japan version), except CODE 430 (On & Offroad package)
• DSR request

Transmission oil auxiliary pump control unit (N89): 

• Actual value of duty cycle (applied current actual value)
• Diagnostic data

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

• Trailer recognition signal

Transfer case control unit (N15/7) (with CODE 430 (On & Offroad package)): 

• Status of transfer case and differential locks

CAN output signals 

Instrument cluster (A1): 

• Selector lever position for gear indicator (A1 p12)
• Multifunction display (A1 p 13)
• Mode selection for Transmission mode display (A1 p16)
• Actuation of engine diagnosis indicator lamp (A1e58)

Electronic Stability Program control unit (N30/4): 

• Wheel torque factor, overall gear ratio
• Actual gear, target gear
• Transmission variant, recognition of basic variants, difference in gear ratios

SAM control unit (N10): 

• Diagnostic data
• Selected Transmission mode for LED display on off-road package Transmission mode control (with CODE 430 (On & Offroad package))

CDI control unit (N3/9) or 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, 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 (N89): 

• Specified value of duty cycle (applied current specification value)

Transfer case control unit (N15/7) (with CODE 430 (On & Offroad package)): 

• Specified locking torque for differential lock

	Wiring diagram for fully integrated Transmission control unit		PE27.19-P-2103-97NAA
	Wiring diagram for intelligent servo module (ISM) control unit		PE27.60-P-2101-97NAA