We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Vehicle Emissions Inspection and Maintenance (I/M): Policy, Guidance and Test Procedures

You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Policy guidance on inspection and maintenance (I/M) program implementation.

Top of Page

Inspection and Maintenance (I/M) Procedures

The IM240 Transient I/M Dynamometer Driving Schedule and The Composite I/M Test Procedure (PDF) (EPA-AA-TSS-91-1, 18pp, 154K, January 1991)

IM240 Technical Guidance

Top of Page

Acceleration Simulation Modes (ASM)

Contact: Dave Sosnowski at 734-214-4823 or dave.sosnowski@epa.gov

Top of Page