Emissions - I/m Dynamometer Emissions Testing

Mercedes Benz C 250 (204.052) (CANADA) V6-2.5L (272.921) Technical Service Bulletin # S-14_00-31 Date: 130201

Emissions - I/m Dynamometer Emissions Testing

Date: February 1, 2013

Order No: S-B-14.00/31

Supersedes: S-SI-MBNA-14/12A, May 1998

Group: 14

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

Page 47

Please see Attachment 1 for a list of vehicles that must be tested on a 4-wheel dynamometer.

Page 48

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

An emissions inspector should also consider the options above if they are uncertain about the Dyno-M ode 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

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 2- Wheel Dynamometer