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

TRANSMISSION 722.902/903/904/906/907 in MODEL 164.1 as of Model Year 09/Modification year 08 Model refinement package 

TRANSMISSION 722.902/903/904 in MODEL 164.8 as of Model Year 09/Modification Year 08 

TRANSMISSION 722.902/904/906/999 in MODEL 251.0 as of Model Year 09/Modification year 08 

TRANSMISSION 722.902/904/906/999 in MODEL 251.1 as of Model Year 09/Modification year 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 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 (D  iagnose-A  ssistence S  ystem).

CAN data bus 

The fully integrated transmission control unit (VGS) is connected to the CAN system of the vehicle via the engine compartment CAN (CAN-C) and exchanges data with other control units.

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 

• Tml. 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))

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

CAN input signals 

Intelligent servo module for DIRECT SELECT (A80) 

• Selector lever position

EIS control unit (N73) 

• Drive authorization system (DAS) 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
• 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
• Requirement torque of Electronic Stability Program (ESP), torque reduction or torque increase

Rear SAM control unit (N10/8) 

• Trailer recognition status (with code (550) Trailer hitch)

Steering column tube module (N80) 

• Steering wheel gear shifter MINUS (S110/1) signal
• Steering wheel gear shifter PLUS (S111/1) signal

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

CAN output signals 

Instrument cluster (A1) 

• Selector lever position for gear display (A1p12)
• Multifunction display (A1p13)
• Mode selection for transmission mode display (A1p16)
• Actuation of CHECK ENGINE indicator lamp (A1e26) with code (494) USA version
• Actuation engine diagnosis indicator lamp (A1e58) except code (494) USA version

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

Central gateway control unit (N93) 

• Diagnostic data

CDI control unit (N3/9) or ME-SFI 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 specified speed (for actuation of the torque converter lockup clutch)
• Status of torque converter lockup clutch
• Emergency transmission control

	Wiring diagram for intelligent servo module (ISM) control unit	A80	Model 164	PE27.60-P-2101-99MAA
		A80	Model 251	PE27.60-P-2101-99RAA
	Wiring diagram for electronic transmission control (ETC) control unit	Y3/8	Model 164	PE27.19-P-2101-99MAA
		Y3/8	Model 251	PE27.19-P-2101-99RAA