Emissions I/m Dynamometer Emissions Testing
Date: February 1, 2013
Order No: SB14.00/31
Supersedes: SSIMBNA14/12A, May 1998
Group: 14
Revision a:
Updated to include model application guide for I/M 240 dynamometer testing
SUBJECT:
MYAll, 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 4wheel dynamometer.
The following vehicle may be tested on a 2wheel dynamometer:
^ MercedesBenz vehicles that are 2WD and not equipped with Acceleration Slip Regulation (ASR)
^ MercedesBenz Maybach and smart vehicles that are 2WD and have "DynoMode" capability (must be activated)
The following vehicles must be tested on a 4wheel dynamometer:
^ MercedesBenz vehicles equipped with ASR
^ MercedesBenz vehicles equipped with 4MATIC
^ MercedesBenz vehicles that are 2WD and do not have "DynoMode" capability
Please see Attachment 2 for a list of vehicles with "DynoMode" 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 2wheel dynamometer, the following should be considered:
^ Test the vehicle on a 4wheel 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 DynoM ode activation procedure
