**UNITED STATES ENVIRONMENTAL PROTECTION AGENCY** NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2565 PLYMOUTH ROAD ANN ARBOR, MICHIGAN 48105 - 2498

**ME MORA**  **NDUM** SUBJECT: Heavy- Duty Hy brid Onboard Diagnostics FROM: Am y Kopin TO: The Docket DATE: July

19 , 2011 On May 17 th, 2011 we held a conference call with Allison to discuss concerns raised by Allison regarding heavy - duty onboard diagnostic (OBD) requirements and timing. C oncerns were raised during the comment period for the heavy - duty greenhouse gas notice of proposed rulemaking that heavy- duty hy brid applications may

not be able to meet the 2013 heavy- duty OBD regulations that we re published in the 2009 OBD Final Rulemaking . 1 , 2 Specifically , they have requested a delay

of the application of HD OBD requirements for hy brid applications until 2020. Attendees from the EPA and Allison are shown in the table below. The agenda is on the following page of this memo.

**Attendee Affiliation**  Cleophas Jackson EPA Anthony Neam EPA Amy Kopin EPA Barb Chance Allison Kevin Rodgers Allison Steve Spurlin Allison Rob Merrion Allison Steve Morey Allison Kevin Karch Allison Jim Lyons Si erra Research Justin Owens Allison John Jen Allison 1 U.S. EPA, NHTSA, and DOT, “Greenhouse Gas Emission Standards and Fuel Efficiency Standards for Medium and Heavy - Duty Engines and Vehicles,” republished December 29, 2010. Available here: http://origin.www.gpo.gov/fdsys/pkg/FR - 2010 - 12 - 29/html/2010 - 32726.htm 2 U.S. EPA, “Control of Air Pollution from New Motor Vehicles and New Motor Vehicles Engines; Final Rule Regulations Requiring Onboard Diagnostic Systems on 2010 and Later Heavy - Duty Engi nes Used in Highway Applications Over 14,000 Pounds; Revisions to Onboard Diagnostic Requirements for Diesel Highway Heavy - Duty Vehicles Under 14,000 Pounds ,” published February 24, 2009. Available here: http://www.epa.gov/otaq/regs/im/obd/regtech/hd - obd - frm - 02 - 24 - 09 - notice - 74 - fr - 8310.pdf OFFICE OF AIR AND RADIATION**UNITED STATES ENVIRONMENTAL PROTECTION AGENCY** NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY

2565 PLYMOUTH ROAD ANN ARBOR, MICHIGAN 48105 - 2498 EPA - Allison Heavy - Duty Hybrid OBD Discussion 3 - 4pm EST Tuesday, May 17 , 2011 

### Ag **enda** 1. Wh at is y our current OBD J1939 capability for handling faults? a. If y ou don’t have any , how long do y ou estim ate it w ill take to make y our current controller’s softw are J1939 capable? 2. Comprehensive Components: a. Wh at is y our understanding of w hat y ou need to do for comprehensive components? b. Wh y do y ou think y our current diagnostics w on’t meet comprehensive compone nts? c. Given that the hy brid sy stem is only covered under comprehensive components, how long w ill it take for y our company to make y our current diagnostics J1939 compatible for fault storage and reporting? d. Do y ou have the ability to determine an open, shorte d to voltage, shorted to ground, an irrational sensor, and a nonfunctioning output component for y our hy brid electronical components? 3. Are there specific requirements or regulations that y ou anticipate having problems w ith and can y ou identify them? 4. EPA Hea vy - Duty OBD Rulemaking and Alternative Fuels Timing 5. Next Steps OFFICE OF AIR AND RADIATION