Dual Clutch Transmission Control Unit, Component Description - GF27.60-P-5171RR

Model 190 With Transmission 700.4 

View of vehicle 

Location 

The dual clutch transmission control unit is located in the trunk in the direction of travel at the left behind the covering.

Tasks 

The DKG control unit with its own, independent diagnostic system determines the current operating condition of the vehicle as well as the dual clutch transmission (DKG) and controls and regulates all sequences taking into account the shift comfort and driving situation.

The transmission control in the DKG control unit is flashable, i.e. the software of the DKG control unit can partially be replaced (updated). Each time the transmission or control unit is replaced, a teach-in process must be performed. The software update, the teach-in process and system diagnosis take place with the aid of XENTRY Diagnostics.

CAN bus 

The DKG control unit is connected to the CAN network of the vehicle via the drive train CAN (CAN C1) and exchanges data with other control units.

Input and output signals 

The following input signals are evaluated by the DKG control unit and the corresponding output signals output:

• Direct input signals 
• Direct output signals 
• CAN input signals 
• CAN output signals 

Direct input signals 

• Terminal 30
• Terminal 31
• Clutch pressure sensor K1 (Y3/11b1)
• Clutch pressure sensor K2 (Y3/11b2)
• System pressure sensor (Y3/11b3)
• Differential pressure sensor (Y3/11b4)
• Temperature sensor module (Y3/11b5)
• Shift fork position sensor 1 (Y3/12s1)
• Shift fork position sensor 2 (Y3/12s2)
• Shift fork position sensor 3 (Y3/12s3)

CAN input signals 

Electronic ignition lock control unit (N73) 

• "Enable" from drive authorization system stage 4 (DAS 4)
• Terminal 50 signal, influence on fault storage

Steering column tube module control unit (N80) 

• Signal of steering wheel downshift button (S110/1), via steering LIN (LIN E1) from the steering wheel electronics (N135)
• Signal of steering wheel upshift button (S111/1), via steering LIN from the steering wheel electronics

Electronic Stability Program control unit (N30/4) 

• Wheel speeds and direction of rotation, substitute values in case of failure of the dual clutch transmission 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
• Requirement torque of the Electronic Stability Program (ESP®), torque reduction or torque increase
• Status of brake, change of shift strategy, braking the vehicle, transmission shifts down earlier
• Cruise control operation, special shifting strategy
• Interface function for electric parking brake control unit (N128) (signal evaluation for standstill control, request for electric parking brake in case of defective park pawl)

ME-SFI control unit (N3/10) 

• Requests for catalytic converter heating
• Shift request
• Engine torque
• Engine coolant temperature
• Engine speed
• Engine load
• Kickdown
• RPM limitation ACTIVE
• Shift fork position sensor 4 (Y3/12s4)
• Pressure distributor position sensor (Y3/12s6)
• Park pawl position sensor (Y3/12s7)
• Gear set group oil temperature sensor (Y3/13b2)
• Dual clutch transmission output shaft RPM sensor (Y3/13n1)
• Dual clutch transmission hollow shaft RPM sensor (Y3/13n2)
• Dual clutch transmission internal shaft RPM sensor (Y3/13n3)
• Engine speed sensor (Y3/13n4)

The temperature sensor module is comprised of the following temperature sensors:

• Clutch temperature sensor K2 (Y3/11 b6)
• Oil cooler temperature sensor (Y3/11 b7)
• Clutch temperature sensor K1 (Y3/11 b8)

Direct output signals 

• System pressure regulation valve (Y3/11y3)
• Clutch regulation valve K1 (Y3/11y4)
• Clutch regulation valve K2 (Y3/11y5)
• Clutch cooling regulation valve K1 (Y3/11y6)
• Clutch emergency shift switchover valve K1 (Y3/11y7)
• Clutch emergency shift switchover valve K2 (Y3/11y8)
• Differential regulation valve (Y3/11y9)
• Clutch cooling regulation valve K2 (Y3/11y10)
• Shift rods regulation valve A (Y3/12y1)
• Shift rods regulation valve B (Y3/12y2)
• Shift rods regulation valve C (Y3/12y3)
• Shift rods regulation valve D (Y3/12y4)
• Pressure distributor switchover valve (Y3/12y5)
• Park pawl switchover valve (Y3/12y6)
• Park pawl locking solenoid (Y3/13b1)
• Engine management limp-home mode
• Accelerator pedal position

AMG gateway control unit (N93/9) 

• Status of transmission mode rotary switch (S192)

DIRECT SELECT INTERFACE (N150) 

• Selector lever position
• Status of "P" button

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

• Diagnosis request

CAN output signals 

Instrument cluster (A1) 

• Multifunction display (A1p13)
• Actuation of engine diagnosis indicator lamp (A1e58)

Electronic Stability Program control unit 

• Wheel torque factor, overall gear ratio
• Actual gear, target gear
• Clutch status K1 or clutch K2 "Open/closed"

Front SAM control unit with fuse and relay module 

• Diagnosis communication

ME-SFI [ME] control unit 

• Drive position
• Transmission mode
• Actual gear, target gear
• Engine torque reduction request
• Starter enable in selector lever position "P", "N"
• Target engine speed, engine idle
• Transmission limp-home mode
• Clutch status K1 or clutch K2 "Open/closed"

Electric parking brake control unit 

• Request for activation of electric parking brake (EFB) in case of defective park pawl system

Wiring diagram for dual clutch transmission control unit

PE27.19-P-2106-97HBA