GF27.60-P-5165AHT Component Description For Fully Integrated Transmission Control Unit
GF27.60-P-5165AHT Component Description For Fully Integrated Transmission Control Unit
- TRANSMISSION 722.931 in MODEL 221.074 /174, 216.374
Top view of electric controller unit (VGS) (Y3/8)
21a Supporting body
Y3/8n4 Fully integrated transmission control (VGS) control unit
Location
The fully integrated transmission control unit (VGS) is integrated in the electric controller unit (VGS) 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 (VGS) determines the current operating condition of the vehicle and controls all the 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 replaced (installed new). The software required for control unit programming is stored on the STAR DIAGNOSIS DAS update DVD.
CAN data bus
The fully integrated transmission control unit (VGS) is connected to the CAN network of the vehicle via the drive train CAN (CAN-C) and exchanges data with other control units.
The ME-SFI [ME] control unit (N3/10) is the interface between the drive train CAN and chassis CAN (CAN E).
The central gateway control unit (N93) is the interface between the chassis CAN (CAN E) and the central CAN (CAN F).
The BAS release switch (A7/7s1) on Model 221 is replaced as of 2.6.09 and on model 216 as of 1.9.10 by the brake light switch (S9/1). With code (233) DISTRONIC PLUS and code (239) ART Plus Light, the BAS release switch is still used.
Input and output signals
The following input signals are evaluated by the fully integrated transmission control unit (VGS) 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
- Terminal 87
- Starting clutch oil pressure sensor (VGS) (Y3/8b1)
- Turbine speed sensor (VGS) (Y3/8n1)
- Internal speed sensor (VGS) (Y3/8n2)
- Output speed sensor (VGS) (Y3/8n3)
- Selection range sensor (VGS) (Y3/8s1)
- Transmission oil temperature sensor (VGS) (Y3/8s2) (integrated in fully integrated transmission control unit (VGS))
Direct output signals
- Working pressure control solenoid valve (VGS) (Y3/8y1)
- K1 clutch control solenoid valve (VGS) (Y3/8y2)
- K2 clutch control solenoid valve (VGS) (Y3/8y3)
- K3 clutch control solenoid valve (VGS) (Y3/8y4)
- B1 brake control solenoid valve (VGS) (Y3/8y5)
- B2 brake control solenoid valve (VGS) (Y3/8y6)
- B3 brake control solenoid valve (VGS) (Y3/8y7)
- Control solenoid valve for starting clutch (VGS) (Y3/8y9)
CAN input signals
Intelligent servo module for DIRECT SELECT (A80)
- Gear selector switch position EIS [EZS] control unit (N73)
- Drive authorization system enable
- "Key-P function" request
- Circuit 50 signal, influencing fault storage ESP control unit (N47-5)
- Wheel speeds and direction of rotation, substitute values in event of malfunction of output speed sensor (VGS)
- 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) required shift into "N", power flow interruption
- BAS release switch or brake light switch, change of shift strategy, brake the vehicle, transmission shifts down earlier
- ESP specified torque, torque reduction or torque increase
Transmission oil auxiliary pump control unitN89
- Actual value of duty cycle (related current actual value)
- Diagnostic data
Steering column tube module (N80)
- Steering wheel gear shifter MINUS (S110/1) signal
- Steering wheel gear shifter PLUS (S111/1) signal
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
Central gateway control unit (N93)
- Diagnosis request
Front central operating unit (/)A40/9
- Transmission mode selection
CAN output signals
Instrument cluster (A1)
- Gear selector switch position for gear indicator (A1p12)
- Multifunction display (A1p13)
- Mode selection for transmission mode display (A1p16)
- Actuation of indicator lamp for engine diagnosis (A1e58)
ESP control unit (N47-5)
- Wheel torque factor, overall gear ratio
- Actual gear, target gear
- Transmission variant, recognition of basic variants, difference in gear ratios
Transmission oil auxiliary pump control unitN89
- Specified value of duty cycle (related current specification value)
Central gateway control unit (N93)
- 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, N"
- Specified engine idle speed (for actuation of starting clutch)
- Emergency transmission limp-home mode
