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

Top of Page