BMW X5 2001- Manuals

BMW X5 2001– User Manual in PDF format online.

Manuals:

User Manual

User Manual BMW X5 2001

Summary

Page 2 - Production: All from Model Introduction; After completion of this module you will be able to:

2 X5 Dynamic Stability Control Model: E53 X5 3.0i, 4.4i and 4.6is Production: All from Model Introduction Objectives: After completion of this module you will be able to: • Understand X5 DSC operation • Identify X5 DSC Components • Understand HDC Operation

Page 3 - Purpose of System; DSC for the X5

3 X5 Dynamic Stability Control Purpose of System DSC for the X5 The X5 is equipped with DSC III for its stability control system. The components are thesame as the DSC III system (version 5.7) currently installed in the E38/E39 vehicles.However the software and programming are changed to allow for n...

Page 5 - Components

5 X5 Dynamic Stability Control Components The components of the X5 DSC III system are similar to the E39 with Bosch DSC III 5.7.The location of some components is slightly different than the E39. The components areas follows: • Integrated Control unit/Hydraulic unit with CAN Interface • Charge pump ...

Page 6 - Control Module/Hydraulic Unit; • Two pre-charge solenoid valves; Brake Pressure Sensor

6 X5 Dynamic Stability Control Components Control Module/Hydraulic Unit The control module is integrated into thehydraulic unit as one compact unit. Thisreduces the size and wiring required forDSC operation. Additionally the motorrelay and valve relay have been replacedby solid state final stages in...

Page 7 - Handbrake Switch

7 X5 Dynamic Stability Control Pre-Charge Pump (Bosch 5.7) The pre-charge pump is located below themaster cylinder in the left side of the enginecompartment. During ASC or DSC regulation with brake inter-vention, the DSC control unit activates the pre-charge pump. The pump delivers brake fluid ata p...

Page 8 - Rotation Rate/Transverse Acceleration Sensor

8 X5 Dynamic Stability Control Rotation Rate/Transverse Acceleration Sensor Located under the center console behind the MRS III control module, the rotation rate andtransverse acceleration sensor provides two inputs to the DSC control module. The sensoris isolated from body/chassis vibrations throug...

Page 9 - DSC Switch; wire Hall Effect Sensor - “Square wave generator”.

9 X5 Dynamic Stability Control DSC Switch The system is active whenever the ignition isswitched on. When pressed, the switch providesa momentary 12 volt signal to the DSC III controlmodule to switch the system off (DSC indicator incluster illuminated.) When pressed again, the sys-tem switches back o...

Page 11 - Brake Fluid Level Warning Switch; A new fluid level switch is incorporated into the reservoir cap.

11 X5 Dynamic Stability Control Brake Fluid Level Warning Switch A new fluid level switch is incorporated into the reservoir cap. • With sufficient fluid level the reed contact is closed. • When level drops below allowable limits, switch opens. Since the normal position is closed, this circuit is mo...

Page 12 - Instrument Cluster Warning Indicators; DSC lamp: Indicates fault in DSC or system disabled by the switch.

12 X5 Dynamic Stability Control Instrument Cluster Warning Indicators Three warning indicator lamps are arranged in the instrument cluster: • DSC lamp: Indicates fault in DSC or system disabled by the switch. • ABS lamp: Indicates a fault in the ABS system. • ABL“BRAKE” lamp: This lamp is a general ...

Page 13 - CAN Interface; Communication with the MK60 includes:; DME; - The MK60 commands the AGS to suppress shifts during regulation.; - The MK60 receives steering angle information.; KOMBI

13 X5 Dynamic Stability Control CAN Interface The MK60 is connected to the CAN bus for communication with the AGS, DME controlmodule, Steering Angle Sensor and the Instrument Cluster. The CAN bus allows all of the connected control modules to send and receive informationand commands. Communication w...

Page 14 - Principle of Operation

14 X5 Dynamic Stability Control Principle of Operation The scope of control for the DSC III is comprised of three systems: • ABS • ASC+T • DSC Based on signals coming from the various sensors the DSC III will determine which systemis best suited to maintain control of the vehicle. In addition to the...

Page 15 - ABS regulation has three phases:

15 X5 Dynamic Stability Control ABS regulation has three phases: • Pressure Build • Pressure Hold • Pressure Release Pressure Build already occurs during normal braking, so when ABS first intervenes it willstart holding pressure by energizing the Inlet Valve. For example, if the right rear wheel isl...

Page 17 - Electronic Brake Force Distribution (EBV); Benefits of EBV are

17 X5 Dynamic Stability Control Electronic Brake Force Distribution (EBV) EBV will adjust brake pressure to the rear axle based on the rate of slow-down of the rearwheels, ensuring even brake force between the front and rear of the vehicle. The control unit monitors the wheel speed when the brakes a...

Page 18 - Engine Intervention; ASC Engine Intervention

18 X5 Dynamic Stability Control Automatic Stability Control (ASC+T) ASC prevents unintentional wheel slip of the drive wheels in every situation. The DSC III control unit determines if the vehicle is loosing traction due to excessive longi-tudinal wheel slip based on input from the wheel speed senso...

Page 19 - The rear brake circuit Intake Valve is energized and opened.

19 X5 Dynamic Stability Control When brake intervention is necessary, the axle not being regulated must be isolated fromthe Pressure Build sequence in the hydraulic unit. This is accomplished by closing bothInlet Solenoid Valves for that axle. Here is an example of an ADB brake intervention at the l...

Page 20 - Longitudinal differential-lock function

20 X5 Dynamic Stability Control Longitudinal differential-lock function By performing brake intervention atthe axle with a low friction coeffi-cient, drive torque can be transmit-ted to the front wheels. Longitudinal and transversal differential-lock function By performing brake interventionat the d...

Page 22 - Understeer; All Inlet Valves are closed except for the right rear inlet.; UNDERSTEER CORRECTION; WITH DSC III; - regulated brake slows

22 X5 Dynamic Stability Control Understeer Understeer occurs when the driver wishes to turn a corner, but despite the front wheelsbeing turned in the direction of the curve, the vehicle continues its forward track. Thisoccurs when the front wheels no longer have sufficient lateral locating force (tr...

Page 23 - Just as an ASC regulation, DSC brake intervention carries out:

23 X5 Dynamic Stability Control Just as an ASC regulation, DSC brake intervention carries out: • Pressure Build • Pressure Hold • Pressure release

Page 24 - Oversteer; OVERSTEER CORRECTION

24 X5 Dynamic Stability Control Oversteer Oversteer occurs when the driver wishes to turn a corner and the tail of the vehicle slidesoutward, leading the turn. This is caused by the rear tires loosing traction and not beingable to hold against the centrifugal force acting upon the vehicle. The DSC I...

Page 27 - X5 DSC New Functions; Hill Descent Control; The following conditions must be met before the HDC will activate:

27 X5 Dynamic Stability Control X5 DSC New Functions Hill Descent Control Hill Decent Control (HDC) is designed for off road use to automatically slow the vehicle andmaintain a steady speed on steep gradients. This function allows the driver to focus onsteering and controlling the vehicle without ha...

Page 28 - Automatic Differential Braking; One axle only with two wheels spinning on the same axle.

28 X5 Dynamic Stability Control Automatic Differential Braking On dry pavement with no wheel slip, the vehicle’s driving torque is split 68% rear and 32%front through the planetary gear differential transfer case. If one or more wheels spin or slip, the DSC will activate a regulation process and the...

Page 30 - Traction Control

30 Braking Systems Traction Control The traction control feature of the DSC III on the X5 cannot be switched OFF with the DSCswitch. Pressing the button will only switch off the dynamic stability control function of theDSC. The traction control feature is needed at all times to provide anti-spin con...

Page 31 - Diagnosis

31 X5 Dynamic Stability Control Diagnosis The following diagnostic functions are available using the DISplus or GT-1. Service Functions: Provides access to specialized test modulesused as post repair procedures. To enter:• Function Selection • Service Functions • Chassis • Dynamic Stability Control ...

Page 32 - Coding; Replacing the DSC III Control Unit.; Steering Angle Sensor; Special Tools available for the Bosch DSC III 5.7 consist of:

32 X5 Dynamic Stability Control Coding Coding must be performed after replacementof the DSC III control module or the steeringangle sensor. ZCS coding is found in theCoding and Programming selection from thestart screen or when pressing the Change button. Follow on-screen instructions for initializa...

Page 33 - review Questions; Desribe the operation of the DSC button on the X5 DSC III system?

33 X5 Dynamic Stability Control review Questions 1. Desribe the operation of the DSC button on the X5 DSC III system? _ _ _ 2. Describe the activation criteria for HDC: _ _ _ 3. What type of wheel speed sensors are used in the X5 DSC III system? _ 4. What is the difference in ABS control logic for t...

Page 34 - Review Questions; What is the handbrake input signal used for?

34 X5 Dynamic Stability Control Review Questions 7. List the various sensors used to detect oversteer/understeer in the DSC III systems. 8. What is the purpose of the DBS sub-function? 9. What is the handbrake input signal used for? 10. What is the criteria for MBC activation? 11. Briefly explain Co...