318 Ho Abc (dps) 03-06-02

R230 Active Body Control (ABC)

1 318 PP ABC (DPS) 1-22-02

These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice. Always check for revised or updated information. To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer to the latest Mercedes-Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair. Illustrations and descriptions in this training reference are based on preliminary information and may not correspond to the final US version vehicles. Refer to the official introduction manual and WIS when available. Copyright Mercedes-Benz USA, LLC, 2002

Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted without written authorization from Mercedes-Benz USA, LLC or its successors. Published by Mercedes-Benz USA, LLC Printed in U. S.A.

2

Objectives & Agenda • •

Quick Review of ABC Changes to ABC in the R230 – Struts – Sensors – Control Unit – SDS Procedures

3

Functions of ABC • •

• •

Automatically maintains vehicle level setting Adjusts ride height based on speed – Lowers car as speed increases and raises car back up as speed decreases Switch raises car two positions An additional switch for a sport setting

4

Sensors - Review •

•

•

•

•

Body acceleration sensors - three – Measures vertical acceleration of the body and body pitch and roll Lateral acceleration sensor - one – Measures side to side acceleration Longitudinal acceleration sensor - one – Measures acceleration and deceleration Vehicle level sensors - four – Measures vehicle level at each wheel Strut motion sensor - four – Determines the position of the hydraulic cylinder 5

Service Notes - Review • Country version code in EIS • Goes automatically to shutoff (closed valve position) when raised on a lift • SAFETY – Uses same fluid as power steering unit – High Pressure (over 200 bar) – Always depressurize system before removing hydraulic components 6

R230 ABC Components

7

Front Axle Valve Unit (Y36/1) Remove paneling under left bumper cover to access B40/1 temperature sensor 14 pressure reservoir

8

Rear Axle Valve Unit Y36/2 Remove wheel well lining to access 4 - supply pressure reservoir 53 - return pressure reservoir

9

Pressure Supply Valve Unit # Remove wheel well lining to access B4/5 pressure sensor 52a pulsation damper

10

Struts Front • Differences between Strut R230 and 215 – Fewer coils – Coils spaced further apart – Increased tensile strength and tension rate

Rear Strut

11

Control Unit - N51/2

12

ABC Control Module (N51/2) • Ride height position is 3mm lower in the United States than the rest of the world • If ABC control module cannot recognize EIS national code, (CAN problem for example), then it uses the last known setting • Load compensation calculation

13

Load Compensation Calculation • Improves ride quality • Must do load compensation calculation: – After doing a level calibration – After doing a plunger sensor calibration If calculation is not done then an error message will appear in the instrument cluster.

14

15

Load Compensation SDS Procedures • Enter into ABC • Enter into Control Unit Adaptations

16

Load Compensation SDS Procedures • Notice requirements • Press F2

17

Load Compensation SDS Procedures • Press F3

18

Load Compensation SDS Procedures

• Nothing physically happens • ABC will make its calculation • This message will appear when finished • Click OK and procedure is over

19

Acronym List (Used in this handout.)

ABC - Active Body Control CAN - Controller Area Network EIS - Electronic Ignition Switch

20