BMW X5 4.6IS User Manual

Initial Print Date:3/02 Revision Date:Subject PageEHC2 ...

10X5 UpdatesSwitch AssemblyThe dash mounted switch assembly supplies a momentary switched ground to the EHC2Control Unit requesting a ride height chan

11X5 UpdatesPrinciple of OperationRide Height Control OperationsIn addition to the automatic ride-height control system for payload compensation, the

12X5 UpdatesThe various levels can be preselected while travelling. Changeover between ride levels iseffected at the speed threshold values defined in

13X5 UpdatesIn addition to the LED indicator, the following text messages canbe displayed in the instrument cluster:•TTRRAAIILLEERR MMOODDEEA coupled

14X5 UpdatesAll control operations in advance / overrun mode are executed as long as pressure is avail-able in the accumulator. When the accumulator i

15X5 UpdatesWorkshop HintsIf a threshold level is exceeded on all 4 wheels when the vehicle is stationary, the controlunit assumes that the vehicle ha

16X5 UpdatesIf the fabric of the bellows is visible, then the bellows must be replaced.Upon completion of repair work, the air suspension system of th

17X5 UpdatesX5 4.6 iSThe X5 4.6iS is an additional model added to the X5 family of SAV’s. The 4.6 receivesmodel code FB93/0266 and is available start

18X5 UpdatesTransmissionThe X5 4.6iS is available only with a ZF A5S 440Z 5-speed automatic transmission whichfeatures modified internal components. M

19X5 UpdatesAdditional Standard FeaturesThe following equipment is added to the 4.4 model equipment for the X5 4.6iS:Glass Moonroof Roller Sun Blinds

2X5 UpdatesX5 UpdatesModel: X5, X5 4.6 iSProduction: 9/02Objectives:After completing this module you should be able to:• Recognize the components of E

20X5 UpdatesReview Questions1. List the advantages of the EHC2 over EHC as used in the X5.2. What component is responsible for limiting the maxi

3X5 UpdatesTwo Axle Air SuspensionPurpose of the SystemThe two axle air suspension system (EHC2) offers advantages over the single-axle air sus-pensi

4X5 UpdatesSystem componentsThe X5 Two Axle Air Suspension System (EHC2) utilizes the air supply unit from EHCmounted in the luggage compartment, with

5X5 UpdatesPneumatic Drain ValveThe Pneumatic Drain Valve is activated pneumatically by pressure from the control valve.This causes the drain valve to

6X5 UpdatesCompressorCompressor operation is the same as in EHC with the following technical improvements:• Addition of a temperature sensor (Located

7X5 UpdatesThe pressure accumulator decreases the load on the compressor and significantly reducesthe time required for large changes in ride height.T

8X5 UpdatesRide Height SensorThe control unit obtains information about the ride height of the vehicle via a ride height sen-sor attached to each of t

9X5 UpdatesAir Suspension StrutRear Minor modifications were made to the rear axle air springs. The air springs and the dampersare configured separate