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Inspection & Maintenance (I/M) - Technical Guidance & Test Procedures
NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
I/M Test Procedures
- The IM240 Transient I/M Dynamometer Driving Schedule and The Composite I/M Test Procedure (PDF) (154K, January 1991)
IM240 Technical Guidance
- November 2000 Inspection/Maintenance Testing Lookup Tables, v 1.8.5
- Read Me File
- Data Format
- Lookup Table Data (EXE) (403K, downloadable, self-extracting into five data files)
- October 3, 2000 Final Report (PDF) (126K)
- Contact: Jim Lindner, phone: (734) 214-4558, email: lindner.jim@epa.gov
- IM240 & Evap Technical Guidance (PDF) (1.8MB, EPA420-R-00-007, April, 2000)
- August 1998 IM240 and Evap Technical Guidance (EPA420-R-98-010, replaces 3/98 draft revised guidance)
- Body of Report (PDF) (370K)
- Appendix A (PDF) (310K)
- Appendix B (PDF) (790K)
- Appendix C-I (PDF) (480K)
- Appendix D Fast Pass Coefficients & Example Calculations (XLS) (500K)
- Full Report (WPD) (360K)
- June 1996 Draft Revised IM240 Technical Guidance: High-Tech I/M Test Procedures, Emission Standards, Quality Control Requirements, and Equipment Specifications: IM240 and Functional Evaporative System Tests (PDF) (414K)
- July 1994: High Tech Inspection and Maintenance Tests (Procedures and Equipment) (PDF) (66K, EPA400-F-93-005)
High-Tech Tests for High-Tech Vehicles
Acceleration Simulation Modes (ASM)
- Acceleration Simulation Mode Test Procedures, Emission Standards, Quality Control Requirements, and Equipment Specifications Final Technical Guidance (PDF) (1.1MB, EPA420-B-04-011, July, 2004)
- June 26, 1996 Final ASM Test Procedure Documentation (PDF) (185K)
- Evaluation of a Four-Mode Steady-State Test with Acceleration Simulation Modes (ASM) as an Alternative Enhanced I/M Test (May, 1993 Report).
- ASM Revised Draft Test Procedure (PDF) (37K)
- Appendices (PDF) (469K)
- Report (PDF) (394K)