Date:

February 1, 2013

Order No.:

S-B-14.00/31
S-SI-MBNA-14/12A, May 1998
14

Supersedes:
Group:

Revision a: Updated to include model application guide for I/M 240 dynamometer testing
SUBJECT:

MY-All, Models All
I/M 240 Emissions Testing on Dynamometer

The enhanced Inspection/Maintenance emission testing program (I/M 240) is in effect in several
states.
It is recommended that all vehicles be tested on a 4-wheel dynamometer.
The following vehicle may be tested on a 2-wheel dynamometer:

•

Mercedes-Benz vehicles that are 2WD and not equipped with Acceleration Slip Regulation
(ASR)

•

Mercedes-Benz, Maybach and smart vehicles that are 2WD and have “Dyno-Mode”
capability (must be activated)

The following vehicles must be tested on a 4-wheel dynamometer:

•

Mercedes-Benz vehicles equipped with ASR

•

Mercedes-Benz vehicles equipped with 4MATIC

•

Mercedes-Benz vehicles that are 2WD and do not have “Dyno-Mode” capability

Please see Attachment 1 for a list of vehicles that must be tested on a 4-wheel dynamometer.
Please see Attachment 2 for a list of vehicles with “Dyno-Mode” capability and the activation
procedure.
According to US Environmental Protection Agency (EPA) procedures, if an emissions inspector
has difficulty performing the I/M 240 test on a 2-wheel dynamometer, the following should be
considered:

• Test the vehicle on a 4-wheel dynamometer, or
• Perform an optional emission test at idle +2500 rpm
This bulletin has been created and maintained in accordance with MBUSA-SLP S423QH001, Document and Data Control, and
MBUSA-SLP S424HH001, Control of Quality Records.

© 2013 Mercedes-Benz USA, LLC.
Mercedes-Benz Canada, Inc.
Dealer Workshop Services
www.MBUSA.com
www.startekinfo.com

All rights reserved. Reproduction or translation in whole
or in part is not permitted without authorization from the
publisher. Printed in U.S.A.
1-800-FOR-MERCedes

An emissions inspector should also consider the options above if they are uncertain about the
Dyno-Mode activation procedure or is uncertain about which vehicles can operate on a 2-wheel
dynamometer.
Attachment 1: Vehicles That Must be Tested on a 4-Wheel Dynamometer
Model Year
1989

Model

1993-1999

All
E-Class (124),
S-Class (126),
SL-Class (129),
190E (201)
190E (201),
E-Class (124),
S-Class (126),
SL-Class (129)
E-Class (124),
SL-Class (129)
S-Class (140),
190E (201)
All

2000→

All

1990

1991

1992

2-Wheel Dyno
Acceptable
All

-

All 2WD

All w/4MATIC

All 2WD w/o ASR

All w/ASR, w/4MATIC

All 2WD w/o ASR

All w/ASR, 400E,
w/4MATIC

-

All

2WD w/ DynoMode Capability*

All
2WD w/o Dyno-Mode
Capability, All w/4MATIC

4-Wheel Dyno Required

* Dyno-Mode is to be used (if available) for all testing. If Dyno-Mode is not available, a 4-Wheel
Dynamometer is required.

Please refer to the Vehicles Operator’s Manual for details regarding ASR and 4MATIC.
Attachment 2: Dyno-Mode Activation Procedure for Operation of a 2WD Vehicle on a 2Wheel Dynamometer
(Note: if unable to activate Dyno-Mode, please consider testing the vehicle on a 4-Wheel Dynamometer)

2

Model Year

Model (2WD only)

Procedure

2001-07

C-Class (203),

1. Ignition key on (position 1)

2003-09

E-Class (211),

2003-09

CLK-Class (209),

2. The display unit on mileage/travel (daily mileage
counter and trip odometer)

2006-11

CLS-Class (219),

2000-06

S-Class (220),

2000-06

CL-Class (215),

2005-11

SLK-Class (171),

2003-11

SL-Class (230),

2011-12

F-Cell (245),

2009-11

M-Class (164),

2004-12

Maybach (240)

3. Push reset-button R, 3 times quickly to display the
workshop menu
4. Use the down arrow button to select Dynamometer Test
(Rollsmode)
5. Push the + button on the steering wheel to activate
Rollsmode

Rollsmode stays on after every ignition event and is
shown by the Info lamp with text information

S-B-14.00/31

Model Year

Model (2WD only)

Procedure
6. To deactivate Rollsmode, turn the Ignition key on
(position 1) and use the down arrow button to select
Dynamometer Test, then push the minus (−) button on the
steering wheel

2008→

C-Class (204),

With phone buttons:

2010→

GLK-Class (204),

1. Ignition key on (position 1) with driver door closed

2010→

E-Class (207/212),

2007→

S-Class (221),

2. The display unit on mileage/travel (daily mileage
counter and trip odometer)

2007→

CL-Class (216),

2012→

CLS-Class (218),

2012→

SLK-Class (172),

2008-09

R-Class (251)

3. Push and hold the phone pick-up button (or hang-up
button, depending on model) then within 1 sec. push and
hold the OK button on the steering wheel for about 3 sec.
until the workshop menu appears
4. Use the down arrow button to select Dynamometer
Test (Rollsmode) and press OK
5. Use the OK button to enable Rollsmode
Rollsmode stays on after every ignition event and is shown
by the Info lamp with text information
7. To deactivate Rollsmode, turn the ignition key on
(position 1) , use the OK button to select Rollsmode off
when ignition off
Without phone buttons:
1. (see above)
2. (see above)
3. Push and hold the + button and within 1 sec. push and
hold the reset-button R for about 5 sec. until the workshop
menu appears
4. Push the left upper menu button on the steering wheel
until Rollsmode appears
5. Activate or deactivate Rollsmode using the R button

2007→

smart (451)

1. Push and hold both buttons on the instrument panel then
turn the ignition key on (position 1) and continue to hold
both buttons for about 7 sec.
2. Start the engine
Rollsmode is activated when the ABS, BRAKE and ESP
(Traction) warning lamps are illuminated
Rollsmode is deactivated when the ignition key and engine
is shut off

S-B-14.00/31

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