Friday, May 17, 2019

Mercedes-Benz A220 2020 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



Mercedes-Benz A220 2020 Page 436



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



Mercedes-Benz A220 2020 Page 437



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

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