How it Works
BMW
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M3 DCT
User Manual
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Table of contents
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BMW M3 DCT User Manual

Table of Contents
M Double-Clutch Transmission with Drivelogic
Subject Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Special Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Comparison of the M DCT to the Manual and SMG . . . . . . . . . . . . . . . .9
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
M DCT System Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
E9x M3 M DCT System Circuit Bus Overview and Terminal Status . .14
Operation and Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Shifting Operation From 1st to 2nd Gear . . . . . . . . . . . . . . . . . . . . . .20
Housing Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Internal Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Automatic Parking Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Emergency Release of Parking Lock . . . . . . . . . . . . . . . . . . . . . . . . . .29
Mechatronics Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Sensors and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
M DCT Transmission Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Torque Intervention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
LIN-bus Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
M-Gear Selector Switch (M GWS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
M GWS Shifter Sensor System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Transmission Oil System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Pressure and Flow Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Two-stage Transmission Oil Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Parking Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Car Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Transmission Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Identifying the Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Service Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Initial Print Date: 05/08
Revision Date:
Subject Page
Possible Fault Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
High Transmission Oil Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Internal Transmission Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Faults Related to Implausible Readings . . . . . . . . . . . . . . . . . . . . . . . .56
Subject Page
BLANK
PAGE
M Double-Clutch Transmission with Drivelogic (M DCT Drivelogic)
Model: 4thGeneration M3
Production: From Start of Production
After completion of this module you will be able to:
• Describe the operation of the M Double-Clutch Transmission with Drivelogic.
• Identify the Components of the M Double-Clutch Transmission with Drivelogic.
• Diagnose the operation of the M Double-Clutch Transmission with Drivelogic.
4
M DCT Drivelogic

Introduction

BMW has introduced the new generation of sequential transmissions. The M Double­Clutch Transmission with Drivelogic (M DKG) GS7D36SG is available as an option on the entire E9x M3 series and is referred to as M DCT Drivelogic.
The M double-clutch transmission combines the benefits of a sequential M transmission with that of an automatic. Like the SMG, it can be used in automatic mode "Drive" and in manual mode "Sequential".
There are 5 Drivelogic programs in automatic “Drive” mode and 6 Drivelogic programs in “Sequential” mode. In sequential mode shifting can either be done with the new electronic sports shift lever, exclusive to the BMW M3, or with paddle shifters on the steering wheel. The main characteristic of this system is that there is no longer an interruption in driving force during the shifting operation.
Shifting is controlled by the M DCT electronics and executed by the M DCT hydraulic components. These are combined into one mechatronics module and integrated into the transmission. The M DCT has a dedicated system to directly lubricate all of the relevant transmission components. The transmission oil temperature is regulated by a special two stage cooling system.
An electric automatic parking lock has been integrated into the system. Selection of the driving programs and gears are controlled using the (M GWS) electric gear selector switch. Different driving modes and settings can be selected through the controller and the fifth settings menu of the CID (option dependent).
M3 vehicle with the new Getrag DKG GS7D36SG double-clutch transmission (M DCT)
5
M DCT Drivelogic

Special Features

GS7D36SG M double-clutch transmission features:
• Hydraulically operated double (wet) clutches
• Integrated mechatronics module, that consists of the M DCT electronics and the M DCT hydraulic components
• Internal direct lubrication of key transmission areas and components
• Special two-stage oil cooling system
• New M DCT electronic gear selector switch M GWS
• Automatic parking lock mechanism
• Drive shaft length has been adapted (shortened) to fit the M DCT transmission
• Fully variable M limited-slip differential with a modified gear ratio of 3.154 (without M DCT 3.846) and modified housing cover
M DCT Internal Structure
6
M DCT Drivelogic
M DCT Applications
Transmission Model Engine/torque
E90 M3
GS7D36SG
E92 M3
E93 M3
SMG/M DCT History
Series Model Engine
E36 M3 S50B32
E46 M3 S54B32O0
Predecessor
manual transmission
1st generation Sequential M transmission Not US
2nd generation Sequential M transmission
S65B40O0
400 Nm
transmission
GS6S420BG 10/1996
GS6S420BG
Basic
Transmittable
torque rating
520 Nm
Introduced
03/2001
06/2003
E85
E6X
E6X
E6X
Z4 M54B25/30
525i, 530i,
530i
545i, 645Ci
550i, 650i
M5/M6 S85B50O0
M54B25/30 N52B30O0
N62B44O0 N62B48O1
Sequential manual transmission
Sequential manual transmission
Sequential manual transmission
3rd generation Sequential M transmission
GS6S37BZ 04/2003
GS6S37BZ 09/2003
GS6S53BZ 09/2003
GS7S47BG 09/2005
M DCT Drivelogic
7
Principle of Operation
1234567 R
TT07-1380
4
2
3
1
BA C
The M DCT consists of two sub-transmissions, each with its own clutch. Clutch 1 with sub-transmission 1 and clutch 2 with sub-transmission 2. Sub-transmission 1 consists of the gears 1, 3, 5, 7 and Reverse while sub-transmission 2 consists of gears 2, 4 and 6. This means that the your next gear is always pre-selected in the other sub-transmission, regardless of whether you are shifting up or down (with the exception of "R").
For example, while still in the acceleration phase of the currently selected gear, if on sub­transmission 1 the next logical gear on sub-transmission 2 is engaged in advance, in a process similar to the Shift Overlap function of an automatic transmission.
Precise control of the clutches when upshifting will allow the driving force to be transferred very quickly and smoothly from sub-transmission 1 to sub-transmission 2 without an interruption in driving power. This results in significant benefits not only for the available driving force but also in terms of shift comfort.
By combining the seamless driving force and comfort of the automatic with the direct connection to the engine as a manual, M DCT provides the benefits of both transmissions.
Simplified drawing of the M DCT functional principle
Index Explanation Index Explanation
A
B
C
Engine S65
Double-clutch transmission
Live axle
1
2
3
4
Sub-transmission 1
Sub-transmission 2
Clutch 1
Clutch 2
8
M DCT Drivelogic

Comparison of the M DCT to the Manual and SMG

t
1
2 3 4
Diagram showing the driving force of one shift event of M DCT compared to SMG and manual transmissions
Index Explanation Index Explanation
1
2
3
Double-clutch transmission (M DCT)
Automated transmission (SMG)
Driving force
4
t
Manual transmission
Time (one shift event)
Note: Smooth gear changing without loss of driving force becomes clear
when compared to the previous manual and SMG transmission.
M DCT Drivelogic
9

Technical Data

A 7 speed manual transmission with wet double-clutch, parking lock, integrated mechatronics module and sport gear ratio.
Description Unit of Measurement
Specified torque [Nm] 520
Maximum engine speed [rpm] 9000
Dry weight without dual mass flywheel [kg] 77
Transmission ratio [:1] Ratio
1st gear: 4.780
2nd gear: 3.056
3rd gear: 2.153
4th gear: 1.678
5th gear: 1.390
6th gear: 1.203
7th gear: 1.000
Reverse gear: 4.454
Shifting options
Control Electrohydraulic
Full oil capacity with transmission oil cooler
(liter)
Oil grade: special new
M DCT long-term oil
E9x M3: R-N-D/S with selectable
Drivelogic program
9
BMW designation DCTF-1
10
M DCT Drivelogic

System Overview.

The components of the 2-stage transmission oil cooling system are built into the left side of the transmission.
External left side view of the M DCT transmission
The mechatronics module is integrated into the transmission on the right side. The oil lines lead to the oil to air heat exchanger (coming from the left side of the transmission).
External right side view of the M DCT transmission
The electronic M DCT transmission control is networked with the M gear selector switch and the interfaces to the E9x M3 vehicle electrical system. The E9x-M3 vehicle electrical system has been expanded to include the M double clutch transmission.
11
M DCT Drivelogic

M DCT System Circuit Diagram

LIN-BusLIN-Bus
KOMBI
FRM
SZL
DSC_SEN
PT-CAN
WUP
DME
DSC
DKG
CAS3
K-CAN
PT-CAN
JB
GWS
Kl. 30g
Kl. 58g
F-CAN
TT07-0884
1
2
3
4
13
9
8
12
65
7
1
1
10
14 15
16
17
12
M DCT Drivelogic
M DCT System Circuit Diagram Legend
Index Explanation Index Explanation
1 DSC control unit (Dynamic Stability Control) 10 Door contact switch
2 Auxiliary water pump 11 Footwell module
3
4 DME/ECM (Digital Engine Electronics) 13 Parking lock electromagnet
5 Instrument cluster 14 Brake light switch
6 CAS control unit (Car Access System) 15 Accelerator pedal module
7 Steering column switch cluster 16 Drivelogic program selector button
8 Diagnostics interface 17 DSC sensor unit
9 Junction box electronics
M DCT electronics (integrated into the
Mechatronics module)
12 M gear selector switch (M GWS)
13
M DCT Drivelogic

E9x M3 M DCT System Circuit Bus Overview and Terminal Status

MRS5
FS
8x (4x)
TCU
CCC
IBOC
SDARS
SZL
RAD2
FLA
USIS
OC3
PDC
RLS
ASP
SBFA
GBFA
GBBF
SMC
CA
TAG E
FZD
ACSM
SMFA
SMBF
TPMS
KOM BI
CON
FRM
CID
IHKA
2x
2x
JB
DSC
IBS
QLT
G
DSC-SEN
TPM-SEN
2x
4x
CAS3
CDC
TOP-HIFI
EKP
LLS
SBX High
SINE
MW-SEN
CTM
> 09/07
ROC
E93
E93
E93
E93
E93
E90/E92
E90/E92
E92
E92
4x
EDC-K
DKG
GWS
DME
EDR
2x
ASP
MOST
PT-CAN
D-CAN
K-CAN
F-CAN
K-Bus (protokoll)
BSD
LIN-Bus
Lo-CAN
CAS3
FRM
JB
DSC
SZL
DCT
GWS
DME
CID
KOM BI
TT07-1325_2
14
M DCT Drivelogic
Index Explanation Index Explanation
ACSM
ASP
CA
CAS3
CCC
CDC
CID
DCT
CON
CTM
DME
DSC
DSC-
SEN
EDC-K
Advanced Crash and Safety
Management (E93 only)
Outside mirrors
Comfort Access
Car Access System 3rd generation
Car Communication Computer
(Compact) CD changer
Central information display
M DCT electronics (integrated
into the transmission)
Controller
Convertible roof module (E93 only)
Digital motor electronics
Dynamic Stability Control
DSC sensor
Continuous Electronic Damping Control
JB
KOMBI
LLS
LWS
MW­SEN
MRS5
OC3
PDC
QLT
RAD
RLS
ROC
SBFA
SBX
High
Junction box
Instrument cluster
Idle speed actuator
Steering angle sensor
Microwave sensors (E93 only)
Multiple restraint system, 5th generation
(E90 and E92 only)
Seat occupancy detector mat (US only)
Park distance control
Quality, level, temperature oil sensor
Radio2
Rain light sensor
Rollover controller (E93 only)
Switch block, driver's door
High-level interface box
EDR
EKP-
SG
FLA
FRM
FS
FZD
GBBF
GBFA
GWS
IBS
IHKA
Throttle valve actuator motor
Electric fuel pump control unit
High beam assistant
Footwell module
MOST direct access
Roof function center
Seat belt extender controller,
front passenger (E92 only)
Seat belt extender controller, driver (E92 only)
M gear selector switch
Intelligent battery sensor
Integrated automatic
heating/air conditioning system
SDARS
SINE
SMBF
SMC
SMFA
SZL
TAGE
TCU
TOP-
HiFi
USIS
Satellite tuner (US only)
Emergency power siren with
integrated tilt alarm sensor
Passenger's seat module
Stepper motor controller
Driver's seat module
Steering column switch cluster
Outside door handle electronics
Telematics Control Unit
Top-HiFi amplifier
Ultrasonic passenger-compartment
sensor (E90/E92 only)
15
M DCT Drivelogic

Operation and Power Flow

R
1
2
3
5
4
6
7
TT07-1719
2 3
8
7
1
7
6
5
9 10
4
Schematic Structure of the M DCT
Index Explanation Index Explanation
1
2
3
4
5
Central input shaft with clutch input
Clutch 1
Clutch 2
Inner input shaft 2
Inner input shaft 1
6
7
8
9
10
Operation
The driving force is guided into the transmission by a central input shaft (1) through wet clutches 1 and 2, which are integrated into the transmission.
Clutch 1 (2) transmits the power to inner input shaft 1 (5).
Clutch 2 (3) transmits the power to inner input shaft 2 (4).
The torque is then transferred to the output shaft (8) via the countershaft (6).
The constant gears (7) are always engaged regardless of the gear selected. The countershaft and the output shaft are also always engaged.
The respective gear pairs are selected via the sliding clutches (9).
The 7th gear is the direct gear, the sliding clutch connects inner input shaft 1 directly to the output shaft.
The parking lock (10) is located directly on the output shaft.
Countershaft
Constant gears
Output shaft
Sliding clutches
Parking lock
16
M DCT Drivelogic
Power Flow
R
1
2
3
5
4
6
7
TT07-1379
R
1
22
3
5
4
6
7
TT07-1324
R
11
2
3
5
4
6
7
TT07-1322
M DCT "Neutral"
1st gear
power flow
2nd gear power flow
M DCT Drivelogic
17
R
1
2
3
5
4
6
7
TT07-1363
R
1
2
3
55
4
7
6
TT07-1365
R
1
2
3
5
44
6
7
TT07-1364
3rd gear power flow
4th gear power flow
5th gear power flow
18
M DCT Drivelogic
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