Bosch DSC 3.X User Manual Page 1

1E46 Dynamic Stability Control Systems Table of ContentsE46 Traction Control SystemsSubject PageModule Objectives ...

10E46 Dynamic Stability Control SystemsKL 30KL 30KL 15KL 15KL 15KL 15DSC SWITCHDSC SWITCHWHEELWHEELSPEEDSPEEDSENSORSSENSORSDIAGNOSISDIAGNOSISABS LAMPA

11E46 Dynamic Stability Control Systems System ComponentsThe E46 DSC III system consists of the following components:• Integrated Control unit/Hydr

12E46 Dynamic Stability Control SystemsComponentsControl Module/Hydraulic UnitThe control module is installed in the engine compartment on the right s

13E46 Dynamic Stability Control Systems All processing functions for ABS, ASC or DSC are performed by the combined controlunit/hydraulic unit. The MK

14E46 Dynamic Stability Control Systems DSC III Hydraulic Unit (Typical)The hydraulic unit consists of an aluminum block containing 12 solenoid valves

15E46 Dynamic Stability Control SystemsCharge Pump (Teves MK 20)the charge pump is installed between themaster cylinder and the brake fluid reservoir.

16E46 Dynamic Stability Control Systems Tandem Brake Master CylinderThe DSC III system uses a tandem brake mas-ter cylinder fitted with central valves

17E46 Dynamic Stability Control SystemsWheel Speed Sensors (Inductive)The E46 DSC III(Mk 20)system uses the wheel speed sensors from the ASC system.

18E46 Dynamic Stability Control Systems The rear sensors can be confused with the Teves MK 60 sensors and will fit in the rear axleof the 4wd car howe

19E46 Dynamic Stability Control SystemsWheel Speed Sensors (Magneto-Resistive)With the introduction of the Teves DSC III MK60, active wheel speed sens

2E46 Dynamic Stability Control SystemsModel: E46 DSC III All versions including:Teves MK20 99-00 E46 323, 328i,is,iCTeves MK20 00- Present M3Teves MK

20E46 Dynamic Stability Control Systems As the high portion of the pulse wheel approaches the sensing element, a deflection of themagnetic field strea

21E46 Dynamic Stability Control SystemsDifferent sensors are used on the left and right sidefront axle of the vehicle. The difference comes inthe len

22E46 Dynamic Stability Control Systems Steering Angle Sensor (LEW)The Steering Angle Sensor is mounted towards the lower end of the steering column,a

23E46 Dynamic Stability Control SystemsRotation Rate SensorThe Rotation Rate Sensor is mounted on a metal bracket under the drivers seat. The sensor

24E46 Dynamic Stability Control Systems Transverse (Lateral) Acceleration Sensor The Transverse Acceleration Sensor is mount-ed in the left “A” pillar

25E46 Dynamic Stability Control SystemsIntegrated Rotation Rate and Transverse Acceleration SensorThe E46/16 uses the combined rotation rate/transvers

26E46 Dynamic Stability Control Systems Brake Pressure Sensors (Teves MK 20 and MK 60)Two brake pressure sensors aremounted on the master cylinderbelo

27E46 Dynamic Stability Control SystemsBrake Pressure Sensor (Bosch 5.7)The brake pressure sensor is mounted on theDSC hydraulic unit in the front axl

28E46 Dynamic Stability Control SystemsDSC ButtonThe DSC button on the Teves MK 20 system oper-ates just as on previous systems. The DSC systemis act

29E46 Dynamic Stability Control Systems Instrument Cluster Warning IndicatorsThree warning indicator lamps are arranged in the instrument cluster:• DS

3E46 Dynamic Stability Control Systems E46 Dynamic Stability Control Purpose Of SystemThe DSC III system is being introduced as an option for the E46

30E46 Dynamic Stability Control Systems CAN InterfaceThe MK60 is connected to the CAN bus for communication with the AGS, DME controlmodule, Steering

31E46 Dynamic Stability Control Systems Principle of OperationThe scope of control for the DSC III is comprised of three systems:• ABS• ASC+T• DSCBas

32E46 Dynamic Stability Control SystemsABS regulation has three phases:• Pressure Build• Pressure Hold• Pressure ReleasePressure Build already occurs

33E46 Dynamic Stability Control Systems ABS Sub-functionsCorner Brake Control (CBC)CBC can occur if the vehicle is cornering and ABS regulation is not

34E46 Dynamic Stability Control SystemsElectronic Brake Force Distribution (EBV)EBV will adjust brake pressure to the rear axle based on the rate of s

35E46 Dynamic Stability Control Systems Automatic Stability Control (ASC+T)ASC prevents unintentional wheel slip of the drive wheels in every situatio

36E46 Dynamic Stability Control SystemsWhen brake intervention is necessary, the axle not being regulated must be isolated fromthe Pressure Build sequ

37E46 Dynamic Stability Control Systems Longitudinal differential-lock functionBy performing brake intervention atthe axle with a low friction coeffi-

38E46 Dynamic Stability Control SystemsASC Sub-function Engine Drag Torque Reduction (MSR)If the vehicle is driven in low gear when coasting down hill

39E46 Dynamic Stability Control Systems UndersteerUndersteer occurs when the driver wishes to turn a corner, but despite the front wheelsbeing turned

4E46 Dynamic Stability Control SystemsTeves DSC III MK 60DSC III MK60 is supplied by Continental Teves and supersedes the Teves DSC III MK20 EIsystem.

40E46 Dynamic Stability Control SystemsJust as an ASC regulation, DSC brake intervention carries out:• Pressure Build• Pressure Hold• Pressure release

41E46 Dynamic Stability Control Systems OversteerOversteer occurs when the driver wishes to turn a corner and the tail of the vehicle slidesoutward, l

42E46 Dynamic Stability Control SystemsDSC Sub-functionsDynamic Brake System (DBS)DBS is designed to assist the driver in emergency braking situations

43E46 Dynamic Stability Control Systems Maximum Brake Control (MBC)The MBC function is designed to support driver initiated braking by building up pre

44E46 Dynamic Stability Control SystemsDiagnosisThe following diagnostic functions are available using the DISplus or GT-1.Control Unit Functions:Expe

45E46 Dynamic Stability Control Systems CodingCoding must be performed after replace-ment of the DSC III control module or thesteering angle sensor.

46E46 Dynamic Stability Control Systems review Questions1. How does the MK20 EI ASC system communicate with DME to reduce engine power during an inter

47E46 Dynamic Stability Control SystemsReview Questions7. Why is a pre-charge pump not required in the MK60 system?_8. What is the purpose of the two

5E46 Dynamic Stability Control Systems Bosch DSC III 5.7The Bosch DSC III 5.7 is used in the E46/16 in place of the DSC III MK 60 used on 2wdvehicles.

6E46 Dynamic Stability Control Systems2002 Model Year UpdateThe DSC system Mk60 has been further developed with regard to certain functions.The yaw-ra

7E46 Dynamic Stability Control SystemsTraction and Stability Control Systems Application ChartS = STANDARD EQUIPMENTO = OPTIONAL EQUIPMENTSTD All = St

8E46 Dynamic Stability Control Systems

9E46 Dynamic Stability Control Systems KL 30KL 30KL 15KL 15DSC SWITCHDSC SWITCHWHEELWHEELSPEEDSPEEDSENSORSSENSORSDIAGNOSISDIAGNOSISABS LAMPABS LAMPDSC