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A-Class and B-Class

Model Refinement

Introduction into Service Manual for Model Series 169 and 245

This printout will not be recorded by the update service. Status: 04 / 2008

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Mercedes-Benz Service

Daimler AG Technische Information und Werkstatteinrichtung (GSP/OI) D-70546 Stuttgart

A-Class and B-Class Model Refinement

Introduction into Service Manual for Model Series

169 and 245


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Information and Copyright

Ordering Workshop Information

All printed workshop information from GSP/OI, such as Introduction into

Service Manuals, System Descriptions, Function Descriptions, Technology

Guides, Technical Data Manuals and adhesive labels, can be ordered as

follows:

In Germany

Through our GSP/OI Shop on the Internet

Link: http://gsp-ti-shop.de

or alternatively

Email: [email protected]

Phone: +49-(0)18 05/0 10-79 79

Fax: +49-(0)18 05 /0 10-79 78

Outside Germany

Please get in touch with the contact person responsible for your market.

Product Portfolio

Comprehensive information about our full Product Portfolio

can also be found at our Internet Portal.

Link: http://open.aftersales.daimler.com

Questions and suggestions

If you have any questions or suggestions concerning this product, please write

to us.

Email: [email protected]

Fax: +49-(0)18 05 /0 10-79 78

or alternatively

Address: Daimler AG

GSP/OIS

HPC R822, W002

D-70546 Stuttgart

2008 by Daimler AG

This document, including all its parts, is protected by copyright.

Any further processing or use requires the previous written consent of

Daimler AG, Department GSP/OIS, HPC R822, W002, D-70546 Stuttgart.

This applies in particular to reproduction, distribution, alteration, translation,

microfilming and storage and/or processing in electronic systems, including

databases and online services.

Image no. of title image: P00.01-3636-00

Order no. of this publication: 6516 1360 02

04/08


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Contents

3oA-Class and B-Class Model Refinement, Introduction into Service Manual for Model Series 169 and 245

Preface 5

Overview

Models and major assemblies 6

Brief description 8

A-Class equipment 10

B-Class equipment 14

Overall vehicle

Exterior 18

Dimensions 24

Technical data 30

Interior 32

Maintenance 34

Drivetrain

Technical data for engine 36

Engine model series M266 40

Engine model series OM640 42

Natural gas drive 45

ECO start/stop function 59


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Contents

4 o A-Class and B-Class Model Refinement, Introduction into Service Manual for Model Series 169 and 245

Chassis

Brake system 70

Design

Networking 72

On-board electrical system 76

Instrument cluster 78

Exterior lights 80

Outside mirrors 86

Power windows 87

Active Park Assist incl. PARKTRONIC 88

Audio and communication 92

Climate control 112

Bodywork 114

Special tools

Drivetrain 116

Abbreviations 117

Index 119


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Preface


Dear reader,

This Introduction into Service Manual presents the

model refinement of the A-Class of model series 169

and the model refinement of the B-Class of model

series 245.

The purpose of this brochure is to acquaint you with

the technical highlights of these vehicles in advance of

their market launch. This brochure is intended to

provide information for people employed in service,

maintenance and repair as well as for aftersales staff.

It is assumed here that the reader is already familiar

with the Mercedes-Benz model series currently on the

market.

In terms of the contents, the emphasis in this Intro-

duction into Service Manual is on presenting new and

modified components and systems.

This Introduction into Service Manual is not intended

as an aid for repairs or for the diagnosis of technical

problems. For such needs, more extensive information

is available in the Workshop Information System (WIS)

and in the Diagnosis Assistance System (DAS).

WIS is updated monthly. Therefore, the information

available there reflects the latest technical status of

our vehicles.

The Introduction into Service Manual presents initial

information relating to the refined A-Class and B-Class

models of model series 169 and 245 and, as such, is

not stored in WIS. The contents of this brochure are

not updated. No provision is made for supplements.

We will publicize modifications and new features in the

relevant WIS documents. The information presented in

this Introduction into Service Manual may therefore

differ from the more up-to-date information found in

WIS.

All information relating to technical data, equipment

and options is valid as of the copy deadline in April

2008 and may therefore differ from the current

production configuration.

Daimler AG

Technische Informationund Werkstatteinrichtung (GSP/OI)

i Note

Information about the vehicles and about oper-

ating the vehicle functions can also be found in the

interactive owner's manual on the Internet at:

www.mercedes-benz.de/betriebsanleitung


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Models and major assemblies

6

Overview

o A-Class and B-Class Model Refinement, Introduction into Service Manual for Model Series 169 and 245

W/C 169Market Launch

06/2008

ModelW 169.0C 169.3

Engine 5-SpeedManual

Transmission

6-SpeedManual

Transmission

ContinuouslyVariable

AutomaticTransmission

A 150169.031

169.331

266.920 716.520

716.5251 722.801

A 170169.032

169.332

266.940 716.520

716.5251 722.801

A 200169.033

169.333

266.960 716.521 722.801

A 200 Turbo169.034

169.334

266.980 711.641 722.801

A 160 CDI169.006

169.306

640.942 716.522 722.800

A 180 CDI169.007

169.307

640.940 711.640 722.800

A 200 CDI169.008

169.308

640.941 711.640 722.800

P00.10-4431-00

Model refinement W 169 with 5 doors shown on A 170 ELEGANCE

1Only on vehicle variant with code (B01) ECO start/stop function (as of 09 /2008)


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Models and major assemblies

Overview


T 245Market Launch

06/2008

Model Engine 5-SpeedManual

Transmission

6-SpeedManual

Transmission

ContinuouslyVariable

AutomaticTransmission

B 150245.231 266.920 716.523

716.5261 722.801

B 170245.232 266.940 716.520

716.5251 722.801

B 170 NGT* 245.233 266.960 716.520 722.801

B 200 245.233 266.960 716.521 722.801

B 200 Turbo245.234 266.980 711.641 722.801

B 180 CDI 245.207 640.940 711.640 722.800

B 200 CDI 245.208 640.941 711.640 722.800

P00.10-4432-00

Model refinement of T 245 shown on B 170

1Only on vehicle variant with code (B01) ECO start/ stop function (as of 09/2008)

* B 170 NGT BlueEFFICIENCY with code (924) Bivalent natural gas drive. The vehicle can either be operated on premium

gasoline or natural gas. The vehicle model and engine model designation of this vehicle correspond to the B 200 model.

Due to the lower engine power, it has the sales designation B 170 NGT BlueEFFICIENCY.


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Brief description

8

Overview


Vehicle concept

With the model refinement (MOPF) of the A-Class and

B-Class, the customer receives a vehicle with a rede-

signed exterior and new technical features and func-tions which are available in these vehicle classes for

the first time.

This is achieved with a fully redesigned front section,

new light alloy wheels, a new rear design and a newly

accentuated interior in both vehicle classes.

Equipped with the New Telematics Generation 2.5, the

refined A-Class and B-Class models feature a new

control and display concept with new functions and a

new design.

In addition, the different model lines of the A-Class are

now classified into new equipment packages

according to their visual appearance and features.

Innovations

A-Class and B-Class

New drive concept with the ECO start/stop

function for the A 150, A 170, B 150 and B 170

models (as of 09/2008) Introduction of the New Telematics Generation 2.5

Media Interface

DAB radio (GB version)

HILL START ASSIST

Adaptive brake lights which flash during

emergency braking

Crash-active emergency lighting

New external release of rear-end door

Active Park Assist incl. PARKTRONIC

B-Class

New model with bivalent natural gas drive

B 170 NGT BlueEFFICIENCY

Standard equipment

As part of the model refinement, the basic equipment

has been significantly improved with the following

features.A-Class and B-Class

New body styling with:

- Redesigned radiator grille

- Modified engine hood

- New bumper covers at front and rear

- Door handles and outside mirrors in vehicle color

- New exterior colors

New hubcaps

New light alloy wheels

Center console with modified stowage areas andcupholders

New surface with aluminum trim strips in cockpit

and door panels

New seat cover materials and door lining materials

Auto on/off headlamps

New outside mirrors with larger mirror surfaces

Front power windows with automatic comfort

control (model series 169.3 additionally features

convenience closing and summer opening)

Ambient lamp and signal lamp in rear-end door

A-Class

New design of lamp units

New shape of rear lamps

Luggage compartment cover

B-Class

Longitudinal member panel in vehicle color

External loading sill protector


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Brief description

Overview


A-Class (W/C 169.0/3)

Dimensions Unit A 200(previous)

A 200(MOPF)

Difference

Vehicle length mm 3,838 3,883 +45

Front overhang mm 640 675 +35

Rear overhang mm 630 640 +10

Vehicle width across outside

mirrors

mm 1,975 2,040 +65

Front overhang angle 17.8 16.6 -1.2

Rear overhang angle 27.6 23.2 -4.4

B-Class (T 245)

Dimensions Unit B 200

(previous)

B 200

(MOPF)

Difference

Vehicle length mm 4,270 4,273 +3

Front overhang mm 842 842 0

Rear overhang mm 650 653 +3

Vehicle width across outside

mirrors

mm 1,975 2,040 +65

Front overhang angle 14.5 13.5 -1.0

Rear overhang angle 27.8 22.6 -5.2

Dimensional concept

With the model refinement, the vehicle length, the

vehicle width and the overhangs of the A-Class have

changed due to the new design of the bumper coversand the enlargement of the outside mirrors.

On the refined B-Class models, this has resulted in a

change to the vehicle length, vehicle width and rear

overhang. The following tables show a selection of the

dimensions affected by these changes.


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A-Class equipment

10

Overview


A 150 A 170 A 200 A 200TURBO

A 160CDI

A 180CDI

A 200CDI

Equipment lines/variants

Standard equipment Standard Standard

ELEGANCE line* Code 955

Standard

(optional)

Code 955

Standard

(optional)AVANTGARDE line* Code 954 Code 954

Sport package* Code 952

Drivetrain

ECO start/stop

function

(as of 09/2008)

Code B01

Diesel particulate filter Standard

Brakes

HILL START ASSIST Standard

Wheels, tires, light alloy wheels

15" steel wheel

(basic equipment)

Standard Standard

16" light alloy wheel in

10-double-spoke

design (ELEGANCE)

Code R06

Standard

(optional)

Code R06

Standard

(optional)16" light alloy wheel in

5-spoke design

(AVANTGARDE)

Code R78 Code R78

* Extended equipment with a detailed description at the end of the A-Class equipment list


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A-Class equipment

Overview


A 150 A 170 A 200 A 200TURBO

A 160CDI

A 180CDI

A 200CDI



7-spoke design

Code R20


6-spoke design

Code R74


AMG 5-spoke design

Code 791

Safety

Active Park Assist incl.

PARKTRONIC

Code 235

Tire pressure loss

warner

Standard

Light systems

H7 reflector head-

lamps

Standard

Bi-xenon headlamps

with cornering

illumination

Code 614

Light and vision

package

Code U62

Adaptive brake lights Standard

Front fog lamps Code U37 Standard Code U37 Standard

Ambient lamp and

signal lamp in rear-enddoor

Standard


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A-Class equipment

Overview


i Note

The special equipment options listed do not cover

all of the equipment available for the A-Class.

Emphasis has been given to listing equipmentoptions whereby the refined model differs from

the previous A-Class.

ELEGANCE line, code (955)

The ELEGANCE line is significantly improved by the

following additions to the standard equipment:

Front fog lamps with chrome ring

Seating comfort package

ARTICO leather

16" light alloy wheels in 10-double-spoke design

Polished stainless steel exhaust tip

Sport package, code (952)

The sport package special equipment incorporates

the following features on the interior and exterior of

the A-Class:

Interior:

Sport pedal assembly

Sport seats (new)

Leather steering wheel with sporty design

Leather gearshift/ selector lever with aluminum

cap

Silver-colored instrument cluster

Exterior:

Exhaust end pipe with sporty design

Rear bumper with black insert (new)

17" light alloy wheels in 7-spoke design

Sports suspension

AVANTGARDE line, code (954)

The AVANTGARDE line is significantly improved by the

following additions to the standard equipment:


Front armrest

Seating comfort package

Rear bumper with black insert


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B-Class equipment

14

Overview


B 150 B 170 B 170NGT

B 200 B 200Turbo

B 180CDI

B 200CDI

Equipment packages

Chrome package* Code 900 Standard Code

900

Standard

Sport package* Code 952 Code 952

Brakes

HILL START ASSIST Standard

Drivetrain

ECO start/stop

function

(as of 09/2008)

Code B01


15" steel wheel

Code (R00)

Standard

16" steel wheel

Code (643)

Standard Standard


5-spoke design

Code R78 Standard Code

R78

Standard


5-double-spoke

design

Code 672

17" light-weight cast

wheel in 10-spoke

design

Code 25R Code 25R

* Extended equipment with a detailed description at the end of the B-Class equipment list


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B-Class equipment

Overview


B 150 B 170 B 170NGT

B 200 B 200Turbo

B 180CDI

B 200CDI



5-spoke design, gloss

chrome

Code R57 Code R57


5-double-spoke

design

Code R11 Code R11


AMG 5-spoke design

Code 791 Code 791

Light systems

Adaptive brake lights Standard

Safety

Active Park Assist incl.

PARKTRONIC

Code 235

Comfort systems

Vertically and horizon-

tally adjustable

steering column

Standard

PTC heater booster Standard

EASY-VARIO-PLUS

system:

Code U57 Code U57

Telephone, audio and communications systems

Comfort telephony Code 386

Audio 20 Code 523


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B-Class equipment

16

Overview


B 150 B 170 B 170NGT

B 200 B 200Turbo

B 180CDI

B 200CDI

Telephone, audio and communications systems

Audio 20 with

integrated 6-disk CD

changer

Code 510

Audio 20 with

integrated 6-disk CD

changer (Canada)

Standard

Audio 50 APS Code 525

Audio 50 APS with

integrated 6-disk DVD

changer

Code 511

COMAND APS Code 527

COMAND APS with

integrated 6-disk DVD

changer

Code 512

COMAND (Japan) Standard Standard

Digital Audio

Broadcasting (DAB)

radio operation

(only GB)

Code 537

SIRIUS satellite radio

(Canada)

Code 536

Speaker system with

center speaker and

bass box

Code 532 Code 532

Sound system

(Harman/Kardon)

Code 810 Code 810

Media Interface (audio

equipment interface)

Code 518


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B-Class equipment

Overview


i Note

The special equipment options listed do not cover

all of the equipment available for the B-Class.

Emphasis has been given to listing equipmentoptions whereby the refined model differs from

the previous B-Class.

Chrome package, code (900)

The chrome package special equipment incorporates

the following features on the interior and exterior of

the vehicle:Interior

Chrome-plated trunk floor handle and inside trunk

sill

Exterior

Waistline trim strip with chrome

Slats of radiator grille in matt brilliant silver with

chrome strips

Enlarged oval exhaust tailpipe in polished stainless

steel External loading sill protector in polished stainless

steel


All-round protective strips with chrome inserts

Glossy "Crosspoint" exterior pillar trim

On the B 200 CDI and B 200 Turbo models, the chrome

package is included in the standard equipment.

Sport package, code (952)

The sport package special equipment includes the

features of the chrome package as well as the

following additional features on the interior and exte-

rior of the vehicle:

Interior

Instrument cluster with white illumination

Steering wheel with aluminum design elements

and perforated leather

Leather gearshift/ selector lever with aluminumcap

Leather hand brake handle

Instrument cluster with white illumination

Upholstery in ARTICO man-made

leather/"Bastogne" material

Pedals with stainless steel caps and rubber naps

Exterior

17" light alloy wheels in new

10-spoke design

Sports suspension Front fog lamps with chrome ring and fin

Rear bumper with reflector design

B 170 NGT BlueEFFICIENCY with

bivalent natural gas drive, code (924)

All of the equipment packages, exterior colors, uphol-

stery variants and, with a few exceptions, all of the

special equipment options available for the B-Class

can also be ordered for the B 170 NGT model. The

following special equipment options cannotbe

installed: Sound system (Harman/ Kardon)

Speaker system with bass box

Run-flat wheel

Spare wheel

Sport package

Sports suspension

17" or 18" light alloy wheels

EASY-VARIO-PLUS system

Emergency vehicles

Load compartment floor adjustable to two levels

(standard equipment)

Stationary heater (accessories range)


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Exterior

18

Overallvehicle

A-Class and B-Class Model Refinement, Introduction into Service Manual for Model Series 169 and 245o

Front view of A-Class

The stylistic features at the front of the vehicle mean

that the individual model lines are now much more

clearly differentiated than before. Whereas the designof the radiator grille and the chrome applications were

the main differentiating features on the previous

models, the design of the air inlets in the bumper

cover also varies on the new A-Class.

On the basic equipment model and the ELEGANCE

line, a horizontal fin in the vehicle color runs through

the center of the air inlet in the bumper, giving the

vehicle a wider appearance.

The new bumper cover clearly differentiates the

AVANTGARDE line from the two other equipment vari-

ants. On the AVANTGARDE line, the pointed shape of

the front section is strongly emphasized by the slanted

dividing bars of the bumper cover.

On the basic equipment model, the radiator grille is a

grained black color with high-gloss black trim strips,

whereas on the ELEGANCE line it is atlas gray with

chrome applications. On the AVANTGARDE line it is

iridium silver in color and also features chrome appli-

cations.

On vehicles with basic equipment that are fitted withfront fog lamps, the lamps are framed by a black ring.

On ELEGANCE and AVANTGARDE vehicles with front

fog lamps, the ring is chrome-plated.

The trim strip concept is based on that of model

series 204. The rub strips are no longer installed.

Instead, the ELEGANCE and AVANTGARDE lines

feature all-round chrome applications integrated into

the bumper covers. On the basic equipment model,

the chrome trim strip is missing from the respective

recesses in the bumper cover.

P00.10-4440-00

Front view of standard vehicle

P00.10-4439-00

Front view of ELEGANCE line

P00.10-4438-00

Front view of AVANTGARDE line


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Exterior

Overallvehicle

19A-Class and B-Class Model Refinement, Introduction into Service Manual for Model Series 169 and 245 o

Rear view of A-Class

The design measures implemented at the rear end are

intended to make the vehicle appear smaller in height

than it actually is. The rear lamps therefore havesmaller vertical dimensions than those of the prede-

cessor model and the shiny cover lenses feature a new

red-white-red color pattern. On the ELEGANCE and

AVANTGARDE lines, the effect of the redesigned rear

lamps is emphasized by trim overlays in a reflector

design in the bumper.

The handle strip of the rear-end door has been rede-

signed in combination with the revamped release

handle. On the basic equipment model, the handle

strip is grained black in color and on the ELEGANCE

and AVANTGARDE lines it features a chrome design.

The bumper surfaces have been reshaped to make the

refined A-Class model appear to sit low and wide on

the road. With a black insert in the bumper, theAVANTGARDE line has an even sportier edge.

The new antenna on the roof has been shortened and

is now suitable for use in automatic car wash facilities.

P00.10-4442-00

Rear view of model 169.3, standard vehicle


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Exterior

20

Overallvehicle


Side view of A-Class

On the side of the vehicle, the previous combination of

rub strips with chrome inserts has been replaced on

the ELEGANCE and AVANTGARDE lines with chromestrips.

The logo indicating the equipment line has been

adopted from model series 204 and is located on the

mirror triangle.

The basic equipment model has been significantly

improved by the addition of outside mirror housings in

the vehicle color with larger mirror surfaces and door

handles that are also painted in the vehicle color.

The design of the light alloy wheels has been revised

and 16" light alloy wheels are now the entry-level

version on the A-Class.The basic equipment model features 15" steel wheels

with new hubcaps in a 10-hole design.

The ELEGANCE line is available with 16" light alloy

wheels in a 10-double-spoke design and the

AVANTGARDE line is available with 16" light alloy

wheels in a 5-spoke design.

Light alloy wheels in a 7-spoke design can be ordered

as special equipment for any of the vehicles regard-

less of the basic equipment or line. The range of 17"

and 18" light alloy wheels on offer is unchanged. All of

the light alloy wheels for the A-Class are painted intitanium silver.

P00.10-4443-00

Side view of model 169.0 AVANTGARDE


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Exterior

Overallvehicle


Front view of B-Class

The front view of the B-Class has been redesigned with

a three-slat radiator grille featuring chrome applica-

tions. On the standard version, the slats of the radiatorgrille are atlas gray in color, whereas they are matt

brilliant silver on vehicles with the chrome package or

sport package.

The air inlets in the bumper cover now feature an even

more distinctive appearance.

The separation line between the engine hood and

bumper cover has been redesigned to be more well-

balanced.

On vehicles with front fog lamps, the lamps are framed

by chrome rings. The chrome ring also features a hori-

zontal fin with a chrome edge on vehicles with thesport package equipment.

In addition, chrome applications are integrated into

the bumper cover on vehicles with the chrome

package and sport package equipment variants. On

the standard version, the chrome trim strip is missing

from the respective recesses in the bumper cover.

P00.10-4444-00

Front view of model 245 with chrome package, code (900)


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Exterior

22

Overallvehicle


Rear view of B-Class

The rear view of the B-Class is characterized by a

number of new features.

These include the redesigned trunk lid handle and theloading sill protector made of grained black plastic or,

on vehicles with the chrome or sport package,

polished stainless steel.

Other features include the rear lamps in a shiny design

or the new bumper with a fine-grained black insert as

standard to give the rear end an even sportier tone. On

vehicles with the sport package special equipment,

this impression is further emphasized by trim overlays

in a reflector design in the bumper.

P00.10-4445-00

Rear view of model 245 with chrome package, code (900)


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Exterior

Overallvehicle


Side view of B-Class

Viewed from the side, the appearance of the vehicle

has been further improved by outside mirrors, door

handles and longitudinal members which are paintedin the vehicle color as standard.

The design of the wheels has also been revised as part

of the model refinement. The hubcaps of the B-Class

have now been redesigned with circular holes and the

vehicle is also available with new 16" light alloy wheels

in a double-spoke design or in a 5-spoke design. The

range of 17" light alloy wheels has been extended with

two new wheel design variants.

P00.10-4446-00

Side view of model 245 with sport package, code (952)


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Dimensions

24

Overallvehicle


P00.1

0-4424-00

1385

14481433

1412

613

525

840

3883

6402568675

701

1318984

983

358

490689

989

512483

291

1547

20401764

1552

1595

Vehicle dimensions shown on 3-door A 200 (model 169.3) Dimensions under no load


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Dimensions

Overallvehicle


3080

5,95 m

10,95 m

1984

613

1886

2)4004

3883

6402568675

3569

2415

1057

1799

1)9,91)852)19,4

1)23,2

1)16,6

P00.1

0-4425-00

1547

20401764

1552

1595

Vehicle dimensions (garage dimensions) shown on 3-door A 200 (model 169.3) Dimensions under no load

1) At permissible gross vehicle weight2) With trailer hitch and protective cap (special equipment)


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Dimensions

26

Overallvehicle


P00.1

0-4426-00

1381

14441422

1411

613525

840

3883

6402568675

723

1318975

983

358

504689

989

512506

291

1547

20401764

1552

1595

Vehicle dimensions shown on 5-door A 200 (model 169.0) Dimensions under no load


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Dimensions

Overallvehicle


2804

5,95 m

10,95 m

1984

613

1886

2)4004

38836402568675

3569

2184

1057

1799

1)9,9

1)852)19,4

1)23,21)16,6

P00.1

0-4427-00

1547

20401764

1552

1595

Vehicle dimensions (garage dimensions) shown on 5-door A 200 (model 169.0) Dimensions under no load



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Dimensions

28

Overallvehicle


P00.1

0-4428-00

1382

14461422

1411

898

1475920

980

381

496716

989

501488

303

622

536

850

4273

6532778842

2040

1547

1777

1552

1604

Vehicle dimensions shown on B 200 (model 245.2) Dimensions under no load


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Dimensions

Overallvehicle


2805

6,55 m

11,95 m

622

1855

1981

2)4365

42736532778842

1257

2386

3682

1747

1981

1)9,51)91 2)20,5

1)22,61)13,5

P00.1

0-4429-00

2040

1547

1777

1552

1604

Vehicle dimensions (garage dimensions) shown on B 200 (model 245.2) Dimensions under no load



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Technical data

30

Overallvehicle


A-Class Unit A 200

(previous)

A 200

(MOPF)

Dimensions

Wheelbase mm 2,568 2,568

Front track width mm 1,552 1,552

Rear track width mm 1,547 1,547

Vehicle length mm 3,838 3,883

Vehicle width mm 1,764 1,764

Vehicle width

(with outside mirrors folded out)

mm 1,975 2,040

Vehicle height mm 1,595 1,595

Drag coefficient Cd 0.31 0.31

A-Class Unit A 200

(previous)

A 200

(MOPF)

Dimensions and weights

Curb weight as per EC directive,

3-door/5-door

kg 1,240/1,270 1,240/1,270

Permissible gross vehicle weight,

3-door/5-door

kg 1,765/1,765 1,765/1,765

Payload, 3-door/5-door kg 525/495 525/495

Max. seating capacity 5

Maximum luggage compartment payload kg 100

Trunk capacity

(to top edge of rear backrest)

l 435 435

Turning circle m 10.95

Tank capacity/reserve l 54/6


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Technical data

Overallvehicle


B-Class Unit B 200

(previous)

B 200

(MOPF)

Dimensions

Wheelbase mm 2,778 2,778

Front track width mm 1,552 1,552

Rear track width mm 1,547 1,547

Vehicle length mm 4,270 4,273

Vehicle width mm 1,777 1,777

Vehicle width

(with outside mirrors folded out)

mm 1,975 2,040

Vehicle height mm 1,604 1,604

Drag coefficient Cd 0.30 0.31

B-Class Unit B 200

(previous)

B 200

(MOPF)

B 170 NGT

(MOPF)

Dimensions and weights

Curb weight as per EC kg 1,345 1,345 1,470

Permissible gross vehicle weight kg 1,880 1,880 1,950

Payload kg 535 535 480

Max. seating capacity 5

Maximum luggage compartment payload kg 100

Trunk capacity*

(to top edge of rear backrest)

l 544 544 544

Turning circle m 11.95

Tank capacity/reserve (gasoline) l 54/6

Tank volume (natural gas) l 100

* When load compartment floor not lowered


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Interior

32

Overallvehicle


General

The interior of the A-Class and B-Class has been rede-

signed as part of the model refinement to further

increase the perception of quality and to tighten upthe linear design. The following changes have been

made to achieve this new appearance on the two

models:

A-Class

On the redesigned A-Class, the previous upholstery

materials have been replaced by the "Mechelen" and

"Namur" upholstery fabrics on vehicles with basicequipment.

The ELEGANCE and AVANTGARDE lines are equipped

with the combination of ARTICO man-made leather

and "Bastogne" material.

On vehicles with the sport seat special equipment,

the combination of ARTICO man-made leather and

"Zandvoort" material is available. A leather interior is

only available with the comfort package special equip-

ment and is not available for vehicles equipped as

standard.

The AVANTGARDE line features trim in smoke silver

aluminum with an obliquely brushed surface.

P68.00-5262-00

Interior design of A-Class


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Interior

Overallvehicle


B-Class

On the redesigned B-Class, the standard version is

equipped with "Groningen" upholstery fabric, whereas

special equipment models feature the combination ofARTICO man-made leather and "Bastogne" material

together with the sport package.

On vehicles with the sport seat special equipment,

the combination of ARTICO man-made leather and

"Zandvoort" material is available.

The range of leather special equipment remains

unchanged.

The trim is made of smoke silver aluminum with an

obliquely brushed surface.

P68.00-5382-00

Interior design of B-Class


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Maintenance

34

Overallvehicle


Extended maintenance strategy for A-Class and B-Class

Both workshops and the customer will benefit from

the extended maintenance scopes from the very first

kilometer driven.By making maintenance less complicated and intro-

ducing the basic service which covers the technically

essential items, workshops are able to offer mainte-

nance that is more cost-efficient and competitive

without compromising the usual Mercedes-Benz

service quality.

Previously, the maintenance scopes alternated

between the minor service (Service A) and the major

service (Service B). These services have now been

classified as Basic serviceA and B respectively,covering the technically essential items.

Basic services A and B always alternate (fixed interval

of every 25,000 km/ 1 year) and only include the tech-

nically essential service items.

A PLUS packagewhich includes further checks and

maintenance items is available additionally.

PLUS package:

Check windshield washer system

Check headlamp cleaning system

Check tire pressure Check expiration date of tire repair kit

Inspect wiper blades

Check trunk illumination

Check indicator lamps in instrument cluster and

interior compartment

Check headlamp adjustment

This PLUS package is a customer option.

ServicePackagePricingSystem (SPPS)

The aftersales system is used to work out and display

the necessary maintenance scopes. The additional

operations that are due as well as the duration and

cost of the service can be determined by entering the

workshop code.

Digital Service Booklet (DSB)

All service, body and major assembly operations aredocumented in a central database using the Digital

Service Booklet (DSB). The customer receives a

service report which he/she stores in the service

booklet.

Maintenance interval

The kilometer intervals are adapted to market-specificrequirements.

The maximum maintenance interval is 25,000 km or

one year.

Mileage-based servicing

ASSYST PLUS calculates in mileage-based servicing

mode when the kilometer interval for the engine oil is

reached before the time interval.

Example of mileage-based servicing:

Engine oil interval 25,000 km/ 365 days (1 year) Driving behavior of customer: 120 km/day

25,000 km : 120 km 208 days

ASSYST PLUS now calculates in mileage-based

servicing mode because the kilometer interval for the

engine oil of 25,000 km is reached before a year has

passed.

i Note about DSB

For further information about the DSB, see the

brochure "ASSYST PLUS Maintenance, Extended

Maintenance Strategy for Model Series as of Modi-

fication Year 2008".

Order no.: 6516 1355 02

This brochure can be ordered from the GSP/OI

Shop.


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Maintenance

Overallvehicle


Time-based servicing

ASSYST PLUS calculates in time-based servicing

mode when the time interval for the engine oil is

reached before the kilometer interval.

Example of time-based servicing:

Engine oil interval 25,000 km/ 365 days (1 year)

Driving behavior of customer: 50 km/ day

25,000 km : 50 km 500 days

ASSYST PLUS now calculates in time-based servicing

mode because the time interval of 365 days (1 year) is

reached before the 25,000 km.

P54.32-6126-00

Service scope (mileage-based servicing)

A1p13 Multifunction display

P54.32-6130-00

Service code

A1p13 Multifunction display

i Note

The indicator for remaining distance or time in the

display may switch between kilometers and time

depending on the driving behavior of the

customer.

Service indicator

The following service information is displayed on the

instrument cluster by ASSYST PLUS:

Service interval/ service code

Remaining distance

Remaining time

Fault and warning messages

The display messages are either shown in white

(service information) or red (fault and warning

messages).

Workshop display

The workshop display is stored in the maintenance

computer and is read out by the customer service

advisor via the instrument cluster or STAR

DIAGNOSIS. The following information can be

displayed:

Read out workshop code Reset service indicator

Read out service scope


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Technical data for engine

36

Drivetrain


A-Class Unit A 150 A 170 A 200

Engine data

Engine model designation M266.920 M266.940 M266.960

Engine designation M266 E15 M266 E17 M266 E20

Engine configuration/no. of

cylinders

Inline 4

Fuel RON 95 (premium unleaded)

Displacement cm3 1,498 1,699 2,034

Bore mm 83

Stroke mm 69.2 78.5 94

Driving performance/fuel economy

Acceleration 0...100 km/h

Manual transmissionAutomatic transmission

s

12.613.5

10.911.5

9.89.9

Maximum speed

Manual transmission

Automatic transmission

km/h

175

170

188

183

200

195

Fuel economy, overall (NEDC),

Manual transmission


l/ 100 km

6.2 6.7

6.6 7.0

6.6 6.8

6.6 7.1

7.2 7.4

7.2 7.4

CO2emissions,

manual transmission

automatic transmission

g/km

148 159

157 166

157 163

157 169

172 176

172 176

Vehicles with code (B01)

ECO start/stop function

Fuel economy, overall (NEDC) l/100 km 5.8 6.2 6.1 6.5

CO2emissions g/km 139 149 146 154


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Drivetrain


A 200

TURBO

A 160

CDI

A 180

CDI

A 200

CDI

M266.980 OM640.942 OM640.940 OM640.941

M266 E20 LA OM 640 D20 RED OM640 D20 OM640 D20 GST

Inline 4

98

(Super Plus unleaded)

Diesel

2034 1991

83

94 92

7.57.3

15.015.3

10.811.1

9.59.6

228

220

170

165

186

181

201

196

7.9 8.1

7.9 8.1

4.9 5.2

5.4 5.8

5.0 5.2

5.4 5.8

5.3 5.4

5.7 6.0

187 192

187 192

128 137

142 154

134 138

142 154

138 140

149 159


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Drivetrain


B 200 B 200

Turbo

B 180

CDI

B 200

CDI

M266.960 M266.980 OM640.940 OM640.941

M266 E20 M266 E20 LA OM640 D20 OM640 D20 GST

Inline 4

95

(premium unleaded)

98

(Super Plus unleaded)

Diesel

2,034 1,991

83

94 92

10.1

10.2

7.6

7.4

11.3

11.8

9.6

9.7

196

190

225

218

183

178

200

195

7.2 7.5

7.3 7.5

7.9 8.1

8.1 8.2

5.2 5.4

5.6 6.0

5.4 5.6

6.0 6.3

173 180

175 180

190 195

195 197

137 140

148 158

140 148

159 165


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Engine model series M266

40

Drivetrain


The A-Class and B-Class are still equipped with the

familiar engine variants from engine model series

M266. The basic engines have not been modified or

further developed.

A new feature is the ECO start/stop function with abelt-driven starter generator for the M266.920 and

M266.940, which is available for the first time in both

the A-Class (A 150/170) and B-Class (B 150/170).

In addition, a vehicle with bivalent drive is available for

the first time in a compact class Mercedes-Benz

vehicle with the B 170 NGT BlueEFFICIENCY.

The M266 E20 CNG engine used in this model is based

on the familiar M266.960 from the B 200.

P01.00-3038-00

M266.960 from A 200

i Note

A separate Introduction into Service Manual is

available for engine series model series M266.

Order No. 6516 1298 02

The ECO start/stop function and natural gas drive

system are described in more detail below.


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Engine model series M266

Drivetrain


A 150

B 150

A 170

B 170

A 200

B 200

A 200 Turbo

B 200 Turbo

Rated output

at engine speed

kW (hp)

at rpm

70 (95)

5,200

85 (115)

5,500

100 (136)

5,500

142 (193)

5,000

Rated torque

at engine speed

Nm

at rpm

140

3,500 4,000

155

3,500 4,000

185

3,500 4,000

280

1,800 4,850

Compression ratio 1 : 11.0 1 : 9.0

P01.00-3044-00

Performance graph 70 kWP01.00-3043-00

Performance graph 85 kW

P01.00-3045-00


P01.00-3042-00


M Torque

P Power output

n Rpm


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Engine model series OM640

42

Drivetrain


The familiar diesel engines of engine model series

OM640 with a displacement of 1,991 cm3are used in

the A-Class and B-Class.

As previously, these economical engines are equipped

with: Four valves per cylinder

Two camshafts

Common Rail Injection

Turbocharger with charge air cooling

Cooled exhaust gas recirculation with

intake air throttling

A new feature is the Lanchester balancer installed on

the 180 CDI and 200 CDI engines of the A-Class and

B-Class since 03/2008.

P01.00-3041-00

OM640.940 from A 180 CDI

i Note

A separate Introduction into Service Manual is

available for engine series model series OM640.

Order No. 6516 1298 02


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Drivetrain


A 160 CDI A 180 CDI

B 180 CDI

A 200 CDI

B 200 CDI

Rated output

at engine speed

kW (hp)

at rpm

60 (82)

4,200

80 (109)

4,200

103 (140)

4,200

Rated torque

Manual transmission


at engine speed

Nm

at rpm

180

200

1,400 2,600

250

250

1,600 2,600

300

280

1,600 3,000

Compression ratio 1 : 18.0

P01.00-3046-00

Performance graph 60 kWP01.00-3047-00


M Torque

P Power output

n Rpm

i Note

The performance graphs apply to vehicles with

manual transmission.

Performance graph of 103 kW variant

See next page


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44

Drivetrain


P01.00-3048-00


M Torque

P Power output

n Rpm

i Note

The performance graph applies to vehicles with

manual transmission.

Lanchester balancer

In order to further increase the ride comfort of the

diesel engines, a Lanchester balancer has been

installed in the 180 CDI and 200 CDI engines of the

A-Class and B-Class since 03/2008.

The Lanchester balancer consists of two forged shafts

supported by multiple bearings which are located

underneath the crank assembly and rotate in opposite

directions to each other at twice the crankshaft

speed. This technology significantly reduces noise

emissions and vibration. The Lanchester balancer of

engine OM640 is based on the technology of the

balancer in engine OM646.

With the Lanchester balancer, the oil capacity of

diesel engines OM640.940 and OM640.941 isreduced. See the following basic data document in the

Workshop Information System (WIS) for the exact

filling capacities:

BF18.00-P-1000-01S

P01.40-2229-00

Model of Lanchester balancer


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Natural gas drive

Drivetrain


Bivalent drive system

The B 170 NGT BlueEFFICIENCY is the first compact

model from Mercedes-Benz with a bivalent natural gas

drive, code (924). This vehicle can either be operatedwith CNG (Compressed Natural Gas) or premium

gasoline.

With its Natural Gas Technology (NGT),

Mercedes-Benz provides its customers with the option

of using either "H-gas" with a high gross calorific value

or "L-gas" with a low gross calorific value for natural

gas operation depending on availability. LPG (Lique-

fied Petroleum Gas) may notbe used in this model.

Advantages

The main advantage of the CNG system is that the CO2

emissions are 20% lower than those of comparable

gasoline powered vehicles. With a consumption of4.9 kg of natural gas per 100 km, the B 170 NGT

BlueEFFICIENCY with manual transmission emits

approximately 135 g of CO2per kilometer.

The fuel costs are lower than on a comparable gaso-

line vehicle.

i Note

The B 170 NGT BlueEFFICIENCY can also be fueled

with biogas (biomethane) that has been processed

appropriately.

P07.54-2055-00

Overview of bivalent drive system


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Natural gas drive

46

Drivetrain


B 170 NGT BlueEFFICIENCY

Rated output

at engine speed

kW (hp)

at rpm

85 (115)

5,750

Rated torque

at engine speed

Nm

at rpm

165

3,000 4,000

Compression ratio 1 : 11.0

P01.00-3050-00

Performance graph

for operation with gasoline or natural gas

M Torque

P Power output

n Rpm


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Natural gas drive

Drivetrain


Natural gas

CNG (Compressed Natural Gas) is a primary energy

source which can be used as a fuel without further

chemical processing.The natural gas is stored in gas cylinders made of a

plastic composite material at a nominal pressure of up

to 200 bar. The gas cylinders are filled via a filling

connection located beside the gasoline tank filler neck

behind the fuel filler flap.

Natural gas is classified according to its gross calorific

value into "H-gas" (H=High) with a high proportion of

methane (89-98%) and "L-gas" (L=Low) with a low

proportion of methane (approx. 85%).

H-gas has a gross calorific value of over11 kWh/m3

L-gas has a gross calorific value of approx.

9.5 kWh/m3

Due to the differences in energy content, operating

the vehicle on H-gas increases the range by up to 20%

compared to operation with L-gas.

Natural gas is measured in kilograms. One

kilogram of natural gas provides about the same

gross calorific value as 1.5 liters of gasoline.

There is a cost benefit compared to gasoline anddiesel fuel because the price of natural gas is

lower.

Some private subsidies from the gas industry and

public sponsorship programs are available to assist

the buyer when purchasing a natural gas vehicle.

Natural gas is not the same as liquefied petroleum

gas. Liquefied petroleum gas (LPG) is a refined

product. It occurs during the distillation of crude oil

and, in contrast to CNG, is heavier than air. It collects

on the ground and is more volatile than CNG. Liquefied

petroleum gas (LPG) may notbe used in the

B 170 NGT BlueEFFICIENCY.

Components of natural gas drive

The following components have been added to engine

266.960 and the fuel system:

CNG control unit Filler connection for natural gas, located behind

the fuel filler flap

5 gas cylinders located in the underfloor area, each

equipped with a gas cylinder shutoff valve

Gas pressure regulator unit with a gas safety shutoff

valve and gas high-pressure sensor, which reduces

the system high-pressure of approx. 200 bar to the

system low-pressure of approx. 6.5 bar.

Low-pressure gas shutoff valve in the gas line to

the gas distribution rail

Gas distribution rail with one gas injection valve

per cylinder

Gas low pressure sensor

Gas temperature sensor

i Note

Only qualified staff may perform work on the gas

system.

After every repair, every time components are

replaced and in the event of accidents affecting

the gas system, a gas system check (GAP) must be

performed.

A gas system check must be performed every two

years and is carried out at the same time as themain inspection (HU). If an unscheduled gas

system check is performed but, at the time of the

main inspection, the unscheduled gas system

check was over 12 months ago, then the gas

system check must be repeated again along with

the main inspection.

The gas system check may only be performed by

qualified, specialist personnel who have success-

fully completed a training course.


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Natural gas drive

48

Drivetrain


Function

The actuation signals for the fuel injection valves are

transferred from the ME-SFI [ME] control unit to the

CNG control unit via direct lines. This control unit thenactuates the fuel injection valves or the gas injection

valves directly.

The ME-SFI [ME] control unit calculates the valve

opening point and valve opening duration individually

for each of the fuel injection valves and each of the gas

injection valves.

Data is continuously exchanged between the ME-SFI

[ME] control unit and the CNG control unit via the driv-

etrain sensor CAN (CAN I).

Each time gas refueling is detected, the quality of thenew gas is determined by the mixture adaptation func-

tion. The potential range of the vehicle is heavily

dependent on the quality of the gas.

The CNG control unit detects that the vehicle has been

refueled based on the pressure difference (before and

after refueling).

During engine start, the vehicle briefly switches to

gasoline operation even when set to gas operation

mode. Depending on certain variables, e.g. engine

operating temperature, the vehicle operates on gaso-line until the operating temperature is reached. This

operating condition can last from several seconds up

to several minutes.

If the temperature in the gas distributor remains

permanently below -15 C at extremely low outside

temperatures, the vehicle does not switch to gas oper-

ation mode.

i Note

There must always be sufficient gasoline in thetank to enable the vehicle to be started.

Changing operating mode

The driver can set the desired operating mode, gaso-

line or natural gas operation, on the multifunction

display of the instrument cluster using the multifunc-

tion steering wheel.

It is always possible to switch between the two oper-

ating modes if there is sufficient fuel.

Safety shutoff

A safety shutoff can be triggered by a system fault or

a crash signal.

If a fault in the natural gas system is detected, the

system may be shut off for safety reasons. The system

can then only be reactivated by erasing the fault using

DAS.

The natural gas and gasoline injection system is shut

off by a crash signal. The gasoline injection system will

be operational for the next engine start if the neces-

sary functional requirements can be met.

The natural gas system can only be reactivated via

DAS after a crash signal.


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Natural gas drive

Drivetrain


P07.54-2056-00

Block diagram of CNG injection system in B 170 NGT BlueEFFICIENCY

B18/1 Gas high-pressure sensor

B18/2 Gas low-pressure sensor

B50/3 Gas temperature sensor

K100kG Circuit 15 relay (1)

K100kL Circuit 87 relay, engine

N3/10 ME-SFI [ME] control unit

N118/2 CNG control unit

Y62y1 Cylinder 1 fuel injection valve




Y106/1 Cylinder 1 gas injection valve




Y107/ 1y1 Gas cylinder 1 shutoff valve





Y107/2 Gas safety shutoff valve

Y107/3 Low-pressure gas shutoff valve

CAN I Drivetrain sensor CAN


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Natural gas drive

50

Drivetrain


Natural gas system

In addition to the conventional fuel tank, five gas cylin-

ders made of a plastic composite material are

installed in the vehicle. Two of these are located in thevehicle floor underneath the front passenger seat and

the three others are located in the underfloor area at

the rear of the vehicle.

The five gas cylinders can hold a total volume of 100 l

when filled with H-gas. This corresponds to a capacity

of approx. 16 kg of H-gas at a pressure of 200 bar anda gas temperature of 15 C.

By installing the gas cylinders in the underfloor area,

the versatility of the vehicle and the space available

are almost completely unaffected. Only the lower level

of the adjustable load compartment floor is no longer

available for use.

P07.54-2057-00

Rear gas cylinders

1 Gas cylinder 1

2 Gas cylinder 2

3 Gas cylinder 3

6 Gas filler connection with check valve

7 Gas fill line8 T-piece with check valve





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Natural gas drive

Drivetrain


The gas cylinders must be replaced after 20 years at

the latest. The gas system is regularly inspected as

part of the gas system check (GAP) during the maininspection (HU) (e.g. visual inspection of tanks, leak

check on gas lines).

The nominal pressure of the gas cylinders is 200 bar.

Each individual gas cylinder is tested with a test pres-

sure of 300 bar and has a design bursting pressure of

more than 600 bar.

The gas cylinders are accommodated in sturdy

brackets. The standard fuel tank for gasoline retains

its full volume of 54 liters.A meltable seal and a flow rate limiter prevent the gas

cylinders from exploding in extreme situations. Each

gas cylinder can also be mechanically locked via a

manual shutoff valve.

P07.54-2058-00

Front gas cylinders

4 Gas cylinder 4

5 Gas cylinder 5




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Natural gas drive

52

Drivetrain


Filler connection

The filler connection with integrated check valve is

located behind the fuel filler flap and provides a

connection between the gas filling station connectionand the gas cylinders.

Depending on the type of filling station and amount of

gas remaining in the cylinders, it takes between 40 s

and 5 min to refuel the gas cylinders.

When the vehicle is fueled quickly, the gas in the cylin-

ders heats up. Accordingly, temperature compensa-

tion is carried out at modern natural gas filling stations

depending on the outside temperature and the total

quantity of gas added.

The refueling procedure produces an unfamiliar noise

which can be heard around the vehicle.

This is part of the system design and is caused by thehigh flow rate of the gas

The maximum possible tank filling pressure and thus

the range of the vehicle is heavily dependent on the

performance of the gas refueling station. A filter in the

filler connection cleans the gas of particles (> 40 m)

to prevent contamination of the tank system.

The gas fill line is the connection between the filler

connection and the T-piece with check valve

The gas cylinders are connected to each other via gas

lines.The mixture formation system is supplied with natural

gas via an additional gas line.

P88.60-2209-00

Tank recess

1 Gas filler connection 2 Tank filler neck (gasoline)


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Natural gas drive

Drivetrain


Vehicle safety in the B 170 NGT BlueEFFICIENCY model

The B 170 NGT model with bivalent drive can either be

operated on premium gasoline or natural gas. The

model has passed all of the relevant crash tests andengineering strength inspections.

The gas cylinders (plastic composite material) were

tested at a test pressure of 300 bar. The burst pres-

sure is approx. 600 bar.

Each of the five gas cylinders is equipped with a safety

coupling. The cylinders are automatically locked by an

electromagnetic shutoff valve when the vehicle is

parked, during gasoline operation and in the event of

predefined forces acting on the vehicle during an acci-

dent.

Thermally activated safety valves with a melting seal,

bursting disks and flow rate limiters prevent the gas

cylinders from bursting.Each gas cylinder can be manually shut off for mainte-

nance operations via a manual shutoff valve.

P07.54-2062-00

Gas cylinder with safety coupling

Gas cylinder with safety coupling

1 Gas cylinder safety coupling

2 Electromagnetic shutoff valve

3 Thermally activated safety valve

4 Manual shutoff valve

5 Flow limiter

6 Bursting disk

7 Gas cylinder

iNote

The service life of the gas cylinders is legally

limited to 20 years. The gas cylinders must there-

fore be replaced after 20 years at the latest.


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Natural gas drive

54

Drivetrain


Variable intake manifold with gas distributor and pressure regulator unit

The following components are attached to the gas

distribution rail of the variable intake manifold:

Gas low-pressure sensor Gas temperature sensor

Gas injection valves

The following components are found on the pressure

regulator unit:

Gas high-pressure sensor Gas safety shutoff valve

Low-pressure gas shutoff valve (separate

component which is installed on the same bracket

as the pressure regulator unit)

P07.54-2059-00

View of variable intake manifold from rear

1 Pressure regulator unit

2 Gas distribution rail

3 Variable intake manifold


B18/2 Gas low-pressure sensor

B50/3 Gas temperature sensor






Y107/3 Low-pressure gas shutoff valve


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Natural gas drive

Drivetrain


Components on gas distribution rail

Gas temperature sensor

The gas temperature sensor records the gas tempera-

ture in the gas distribution rail and forward this infor-mation to the CNG control unit so that the injection

quantity can be measured correctly.

The NTC resistor installed in the temperature sensor

alters its electrical resistance in line with the gas

temperature. The resulting changes in signal voltage

are evaluated by the CNG control unit.

Gas low-pressure sensor

The gas low-pressure sensor records the system pres-

sure in the low-pressure system. It transmits its signalto the CNG control unit, which monitors the current

gas pressure at the low-pressure side.

The pressure measuring range of the gas low-pressure

sensor is between 0 and 10 bar.

Pressures outside this range are evaluated as a fault

by the CNG control unit, which then prevents the

vehicle from operating in gas operation mode.

Gas injection valve

When the magnet coil is energized by the CNG control

unit, the armature sleeve with an injection molded soft

seal is lifted away from the valve seat towards the coil

spring. The gas comes out via the four slot-shaped

openings of the valve seat.

The duration of the actuation depends on the quantity

of gas required. The actuation duration is calculatedby the ME-SFI [ME] control unit.

P07.54-2061-00

Gas injection valve

1 Coil

2 Spring

3 Solenoid armature4 Valve seat

5 Valve seat diffusor cap


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Natural gas drive

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Drivetrain


Pressure regulator unit

The task of the pressure regulator unit is to reduce the

high pressure of the gas in the gas cylinders from

200 bar to the system pressure required at the engineintake side of 6.5 bar.

Pressure relief valve

If the pressure regulator unit malfunctions, the pres-

sure relief valve is opened as of a pressure of 16 bar,

allowing the natural gas to escape into the atmo-

sphere.

If the pressure relief valve is actuated, a fault is

detected by the CNG control unit and the gas safety

shutoff valve is closed.

Pressure regulator unit heater

Because the gas loses heat as its pressure is being

reduced from the cylinder pressure to 6.5 bar, the

pressure regulator unit is fitted with a heating plate

which is connected to the heating circuit. This

prevents the pressure regulator unit from icing up.

High-pressure sensor

The gas high-pressure sensor is screwed into the pres-

sure regulator unit. It records the absolute gas

cylinder pressure in the range of 0 to 260 bar andtransmits a proportional electrical signal to the CNG

control unit. The gas cylinder pressure is displayed in

the instrument cluster as the tank fill level.

Gas safety shutoff valve

The gas safety shutoff valve separates the gas high-

pressure circuit from the gas low-pressure circuit.

The gas safety shutoff valve is actuated by the CNG

control unit. When it is actuated, a duct is opened in

the gas pressure regulator between the gas high-pres-

sure circuit and the gas low-pressure circuit.If the CNG control unit detects a system fault or

receives a crash signal, the gas safety shutoff valve is

closed.

In the rest condition (deenergized) the gas safety

shutoff valve is closed by an integral spring.

P07.54-2060-00

Design of pressure regulator unit

1 Pressure regulator unit

1a Pressure relief valve



A Gas high-pressure inlet

B Gas low-pressure outlet

C Heating circuit connections


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Natural gas drive

Drivetrain


Displays on multifunction display (A1p13) of instrument cluster

P54.32-6145-00

P54.32-6135-00

P54.32-6133-00

Preselecting/switching operating mode

Using the left and right multifunction steering wheel

button groups, the driver can switch to the "Vehicle

operating mode" menu. Here, it is possible to choose

between natural gas and gasoline operating mode.

When natural gas mode is selected, a gas cylinder

symbol appears in the multifunction display. The

switchover only takes place when all of the function

conditions are met. This is indicated by the CNG indi-

cator on the tachometer.

Fill level of gas cylinders

The driver can use the left and right multifunction

steering wheel button groups to display the available

gas quantity.

Warning and fault messages on multifunction display (A1p13) of instrument cluster

Warning message about gasoline operation

This warning message is displayed when the driver

wants to switch from natural gas operation (gas

cylinder symbol) to gasoline operation but there is not

enough fuel in the tank for gasoline operation.


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Natural gas drive

58

Drivetrain


P54.32-6155-00

Fault message about gasoline operation

This fault message is displayed in the event of a

system fault which prevents gasoline operation of the

vehicle.

P54.32-6140-00

Warning message about natural gas operation

This warning message is displayed when the driver

wants to switch from gasoline operation to natural gas

operation but there is not enough fuel in the cylinders

for natural gas operation.

P54.32-6150-00

Fault message about natural gas operation

This fault message is displayed in the event of a

system fault which prevents natural gas operation of

the vehicle.


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Drivetrain


ECO start/ stop function with belt-driven starter generator

As of September 2008, the ECO start/stop function,

code (B01), will be available as special equipment for

the following models of model series 169 and 245: A 150 and A 170 with 5-speed manual

transmission

B 150 and B 170 with 5-speed manual

transmission

On vehicles with the ECO start/stop function, the

engine is switched off during idle periods. This tempo-

rarily eliminates the consumption of fuel and the emis-sion of exhaust gases and noise.

P15.40-2509-00Location of components for ECO start/stop function

A1 Instrument cluster

B64/1 Brake vacuum sensor

B79/2 Transmission neutral position sensor

B95 Battery sensor

G1 Battery

G1/ 7 Additional battery

K19 Battery decoupling relay

K57/2 Additional battery relay

M1/10 Starter generator


N10 SAM control unit

N72/1s44 AS/IRS OFF switch

N72/1s45 ECO switch

N73 EZS control unit

N129 Starter generator control unit

S40/ 3 Clutch pedal switch

S40/5 Start enable clutch pedal switch

S62 ATA [EDW] hood switch


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Drivetrain


Functional principle

On vehicles with the ECO start/stop function, the

crankshaft is driven by the starter generator via a

poly-V belt to start the vehicle.

Advantages

The use of a belt-driven starter generator has the

following benefits:

Reduction of fuel consumption by

approx. 6 to 7%

Reduction of CO2emissions to as low as

139 g/km

Very quiet and quick starting procedure via the

starter generator

Reduction in noise pollution when engine is

switched off

Activation

The following function requirements must be met for

the ECO start/stop function to be activated:

Engine at operating temperature

Battery status OK

Outside temperature in a comfortable range

Interior temperature close to specified value set on

AAC [KLA] control and operating unit, code (580),

or comfort AAC [KLA] control and operating unit,

code (581)

Indicator lamp in ECO switch must be on

Vacuum in brake booster must be sufficient

Engine hood closed

Main functions

The ECO start/stop function consists of the following

main functions:

Engine stop function Engine start function

Forced engine start

Engine stop function

The engine is switched off by the ME-SFI [ME] control

unit when the following function conditions are met:

Transmission in neutral

Clutch not actuated Service brake operated

Vehicle speed below threshold value (8 km/h)

Engine start function

The engine is started automatically when the engine

was switched off via the engine stop function and

circuit 15 is still on.

One of the following function conditions must be met

for this to take place:

Service brake not actuated

Clutch actuated

ECO switch actuated

Vehicle speed above threshold value (8 km/h)

To restart the engine, the ME-SFI [ME] control unit

forwards a start signal to the starter generator control

unit via the engine compartment CAN. This then actu-

ates the starter generator directly.

The starter generator drives the crankshaft via the

poly-V belt. This starts the engine.


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Drivetrain


Forced start

The forced engine start function is also available as a

protection function. The engine is automatically

forced to start by the ME-SFI [ME] control unit withoutany driver intervention if one of the following function

conditions occurs:

Vacuum in brake booster is not sufficient

Indicator lamp in ECO switch is not on

Battery charge level drops below threshold value

Components

New components

Starter generator control unit

Battery sensor on battery 12 Ah additional battery (absorbent glass mat

battery)

70 Ah battery (absorbent glass mat battery)

Starter generator (replaces alternator)

Battery decoupling relay

Additional battery relay

Hydraulic belt tensioner

ECO switch

Transmission neutral position sensor

Brake vacuum sensor

Modified components

Wiring harness

Clutch pedal switch

Start enable clutch pedal switch

Modified ME-SFI [ME] control unit

Modified SAM control unit

Modified instrument cluster

Modified poly-V belt

Modified refrigerant compressor

Modified ATA [EDW] hood switch Water pump and crankshaft belt pulley

Water pump bearing

P07.54-2066-00

Data flow chart of engine stop function

See next page for legend

i Note

On ECO start/stop vehicles, the starting proce-

dure with the transmitter key still takes place via

the starter. The function sequence of the starting

procedure remains unchanged.


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Drivetrain


P07.54-2065-00

Data flow chart of engine start function

1 Brake pedal switch, status

2 Clutch switch, status

3 Engaged gear, status

4 Brake vacuum, status5 Wheel speed signal

6 Battery, charge status

7 ECO switch, status

8 Starter generator, actuation

9 Additional battery relay, switch request

10 Battery decoupling relay,

switch request



B95 Battery sensor

G1 Battery M1/10 Starter generator



N18 HEAT [HAU] control and operating unit

N22 AAC [KLA] control and operating unit

N22/7 Comfort AAC [KLA] control and operatingunit

N47-5 ESP and BAS control unit

N72/1 Upper control panel control unit

N72/1s45 ECO switch


N129 Starter generator control unit

S9 /1 Brake light switch


S40/ 5 Start enable clutch pedal switch

CAN B Interior CAN

CAN C Engine compartment CANLIN B7 On-board electrical system LIN

LIN B8 Climate control LIN


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Drivetrain


P15.40-2507-00

Block diagram of ECO start/stop function

A1 Instrument cluster



B95 Battery sensor K19 Battery decoupling relay

K57/2 Additional battery relay

M1/10 Starter generator



N18 HEAT [HAU] control and operating unit

N22 AAC [KLA] control and operating unit

N22/7 Comfort AAC [KLA] control and operating

unit

N47-5 ESP and BAS control unit

N72/1 Upper control panel control unit

N72/1s45 ECO switch


N129 Starter generator control unit S9 /1 Brake light switch


S40/5 Start enable clutch pedal switch

upustvo 169 245

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