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

TRANSMISSION 722.902 in MODEL 463.306/336/346 up to 31.5.12 as of Model Year 2011/YoM 10 

TRANSMISSION 722.904 in MODEL 463.202/222/236/237 up to 31.5.12 as of Model Year 2009/YoM 08 

TRANSMISSION 722.902 in MODEL 463.303/340/341 up to 31.5.12 as of Model Year 2009/YoM 08 

Top view of electric controller unit (VGS) (Y3/8) 

Location 

The fully integrated transmission control unit (VGS) is integrated in the electric controller unit (VGS), which is located at the bottom in the transmission.

Task 

General 

The fully integrated transmission control (VGS) control unit determines the instantaneous operating condition of the vehicle and actuates all gear change sequences taking ease of shifting and driving situation into consideration.

The fully integrated transmission control unit (VGS) has the following tasks:

• Reading in of sensors, pickups and signals 
• Evaluation of input factors 
• Actuation of components 

Reading in of sensors, pickups and signals 

The input factors are read in via the following connections:

• Direct line 
• Drive train CAN (CAN C) 

Direct line 

The following sensors and signals are read in via a direct line:

• Circuit 31
• Circuit 87
• 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))

Drive train CAN 

The following signals and information are read-in over the drive train CAN:

• From the EZS control unit (N73)
  • Drive authorization system enable
  • "Key-P function" request
  • Circuit 50 signal, influence on fault storage process
• From ESP 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
  • ESP request shift to "N", interruption of power flow
  • BAS release switch (A7/7s1), change of shift strategy, brake the vehicle, transmission shifts down earlier
  • ESP specified torque, torque reduction or torque increase
• From CDI control unit (N3/9) (with diesel engine) or ME-SFI control unit (N3/10) (with gasoline engine)

  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
• From instrument cluster (A1)

• Vehicle speed

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.

Actuation of components 

The actuation of the components takes place via the following connections:

• Direct line 
• Drive train CAN 

Direct line 

The following components are actuated via a direct line:

• 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)
• Torque converter lockup clutch control solenoid valve (VGS) (Y3/8y8)

Drive train CAN 

The following components are actuated over the drive train CAN:

• Instrument cluster
  • Selector lever position for gear display (A1p12)
  • Multifunction display (A1p13)
  • Transmission mode display (A1p16)
  • Actuation of CHECK ENGINE indicator lamp (A1e26) (with code (ZU8) USA version)
  • Actuation of engine diagnosis indicator lamp (A1e58) (without code (ZU8) USA version)
• ESP control unit
  • Wheel torque factor, overall gear ratio
  • Actual gear, target gear
  • Transmission variant, recognition of basic variants, difference in gear ratios
• CDI control unit or ME-SFI [ME] control unit

• Drive position
• Actual gear, target gear

  Engine torque reduction request

• Starter enable in selector lever position "P", "N"
• Engine idle specified speed (for actuation of the torque converter lockup clutch)
• Status of torque converter lockup clutch
• Emergency operation transmission control