30 AIR REPAIR OBDII REVIEW 2008
The U.S. EPA has coordinated with the automotive industry
to develop this list document. The document is separated by
manufacturer and by ascending model year starting with MY1996,
the first year that full OBD compliance was required, and
ending with MY2007 (in some cases MY2008 information was
provided and is included, where available). However, it should
be noted that all MY2005 and beyond light-duty alternative
fuel vehicles are required to have full OBD monitoring
capabilities during gasoline and alternative fuel operation
since the OBD monitoring flexibilities during alternate fuel
operation have been removed. Therefore, MY2005 and beyond
FFVs should not exhibit any design-intent OBD I/M impacts.
For alternative fuel vehicles, there were earlier concerns
during OBD implementation regarding OBD system monitoring
capability during alternative fuel operation. These concerns
necessitated additional OBD monitoring flexibilities during
alternative fuel operation to eliminate the potential of false MIL
illumination. Therefore, Federal OBD regulations in 40 CFR
86.1806-05 allowed manufacturers of alternate fuel vehicles
to request waivers from OBD monitoring during alternate
fuel operation until the 2004 model year (MY). In particular,
FFVs are of greater concern since there is no clear indication
of a switch from a petroleum-based fuel to an alternative fuel.
As a result, the OBD system for FFVs may operate differently
from other vehicles including revised OBD system capability and
engine calibration when the level of alternative fuel, specifically
ethanol, is increased. This is further complicated if the vehicle is
operated for an extended period of time or solely on ethanol prior
to a state inspection of the OBD system.
Model
Year Model
Displacement &
Engine Type/
Ethanol Content
Engine Family/
Test Group
(VIN ID) Comments
1998
Chrysler Caravan and Town
and Country / Dodge Caravan /
Plymouth Voyager
3.3L V-6 / (E85) WCRXT03.32BP
(VIN 8th digit: G)
All monitors disabled for operation >E30 and ethanol
fuel content learning.
Desensitized system monitors:
- fuel system rail check only for >E30;
- fuel system rich for >E50;
- fuel system lean and misfire for E0-E10 and coolant
temp >230 deg. F;
- purge flow check
Re-enablement procedure: five (5) fuel add event1 of
gasoline followed by two engine cold starts2
1999
Chrysler Town and Country
/ Dodge Caravan / Plymouth
Voyager
3.3L V-6 / (E85) XCRXT03.32BP
(VIN 8th digit: G)
2000
Chrysler Caravan, Voyager,
and Town and Country / Dodge
Caravan / Plymouth Voyager
3.3L V-6 / (E85)
YCRXT03.32BP
(VIN 8th digit: G)
2001
Chrysler Caravan, Voyager
and Town and Country /
Dodge Caravan
3.3L V-6 / (E85)
1CRXT03.32DP
1CRXT03.32DT
(VIN 8th digit: 3) No monitors disabled for alternate fuel operation.
Desensitized system monitors:
- evaporative leak check for >E30;
- fuel System Rich for >E50;
- purge flow check
Re-enablement procedure: five (5) fuel add events1 of
gasoline followed by two engine cold starts2.
2002
Chrysler Caravan, Voyager
and Town and Country / Dodge
Caravan
3.3L V-6 / (E85) 2CRXT03.32DP
(VIN 8th digit: 3)
2003 Dodge Stratus / Chrysler Sebring
Convertible/Sedan
2.7L V-6 /
(E10 and E85)
3CRXV02.7VDP
(VIN 8th digit: T)
2003
Chrysler Caravan, Voyager
and Town and Country / Dodge
Caravan
3.3L V-6 / (E85)
3CRXT03.32DP
3CRXT03.32DR
(VIN 8th digit: 3)
Chrysler Corporation
1 A fuel add event is defined by an increase in fuel tank level of at
least five (5) gallons.
2 Engine cold start occurs with engine coolant temperature between
40 & 95°F and within 12°F of ambient temperature.
Flex-Fuel Vehicles (FV)
Partial excerpt from the OBD System Functionality
on Flexible Fuel Vehicles and Methods for OBD I/M
Resolution
May 29, 2007
Developed by:
Arvon L. Mitcham
Program Manager/Engineer
Certification and Innovative Strategies Division
Office of Transportation and Air Quality
United States Environmental Protection Agency
