Fully integrated transmission control unit, component description - GF27.60-P-5165AHQ

MODEL 218 with TRANSMISSION 722.9 (except 722.931)

View of fully integrated transmission control controller unit (Y3/8) from front left, shown with fully integrated transmission control 4 (VGS4-0, as of YoM 12)

Fig 1: View Of Fully Integrated Transmission Control Controller Unit (Y3/8) - Front Left

Courtesy of MERCEDES-BENZ USA

Location

The fully integrated transmission control unit is integrated into 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 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.

The ME-SFI [ME] control unit (N3/10) (for gasoline engines) or CDI control unit (N3/9) (for diesel engines) acts as an interface between the drive train CAN and the chassis CAN (CAN E).

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
Turbine wheel rpm sensor (Y3/8n1)
Internal transmission speed rpm sensor (Y3/8n2)
Output shaft rpm sensor (Y3/8n3)
Selection range sensor (Y3/8s1)
Transmission oil temperature sensor (Y3/8s2) (integrated in 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

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 and model 218.374/974) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS or model 218.374/974)

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 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)

Downshift steering wheel gearshift button (S110/1)
Upshift steering wheel gearshift button (S111/1)
Selector lever position

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

Diagnosis request

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

Requests for catalytic converter or diesel particulate filter (DPF) 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 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 for gear display (A1p12)
Actuation of indicator lamp for engine diagnosis (A1e58)

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 control unit (N3/10) or CDI control unit (N3/9)

Drive position
Transmission mode
Actual gear, target gear
Engine torque reduction request
Starter enable in selector lever position "P" or "N"
Emergency operation transmission control

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

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

Technical data Designation		Unit	Value	Remarks
Control unit for fully integrated transmission control (Y3/8n4)
Power supply		V	13.5
Voltage limit:	minimum maximum	V V	9.0 16.0
Limited functionality:	minimum maximum	V V	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				No
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