OBD Readiness Testability Issues
&EPA
United States
Environmental Protection
Agency

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         OBD  Readiness Testability  Issues
                      Transportation and Climate Division
                     Office of Transportation and Air Quality
                     U.S. Environmental Protection Agency
United States
Environmental Protection
Agency
EPA-420-B-12-044
June 2012

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OBD ReadinessTestability Issues1
Make
Acura
Audi and
Volkswagen
Chrysler
Chrysler
Dodge
Dodge
Dodge
Dodge
Dodge
Dodge
Model
Year
1997
1996-2002
1996 built
prior to
11/21/95
2010 built
prior to
2/20/10
1996 built
prior to
11/21/95
1996
2003
2003
2004-5
2006-7
Model
2.5 TL
All models
with non-OEM
stereos
Cirrus,
Sebring,
Sebring
Convertible,
Concord, LHS
300 with 3.5L
engine and 5-
speed
automatic
transmission
Stratus,
Intrepid, Neon,
Avenger
Stealth
Dakota,
Durango and
Ram Trucks
with 4.7L
engine and
California or
50 state
certified.
Ram Truck
with Cummins
5.9L diesel
engine and
California
certified
Ram Truck
with Cummins
5.9L diesel
engine and
California
certified
Ram Truck
with Cummins
5.9L diesel
engine.
Problem
Trouble
communicating with
some scan tools
If OEM stereo has
been replaced with
an aftermarket unit,
the OBD system may
not communicate
with and may
damage the scan tool
All monitors reset to
incomplete upon
every ignition key-off.
Evaporative Leak
Detection Monitor
may not set to ready
All monitors reset to
incomplete upon
every ignition key-off
All monitors reset to
incomplete upon
every ignition key-off
Catalyst monitor
readiness status may
indicate not
supported
MIL may illuminate
erroneously.
Comprehensive
component monitor
status may not set to
ready
Comprehensive
component monitor
status may not set to
ready
Fuel system monitor
and comprehensive
component monitor
status may not set to
ready
Action
Attempt communication with a different scan tool.
See OBD clearinghouse for more information.
Ensure scan tool has complete current/voltage
override protection. For more information, see VW
Technical service bulletin 02-03 dated June 10,
2002.
Recall campaign #678 applies to California certified
vehicles in California. TSB #18-005-01 applies to all
other vehicles with a lifetime warranty.
TSB# 18-008-10 Revision A
Recall campaign #678 applies to California certified
vehicles in California. TSB #18-005-01 applies to all
other vehicles with a lifetime warranty.
These vehicles are not reflashable and should be
tested without regard to monitor readiness
TSB#1 8-032-10 with lifetime warranty
Recall Campaign #K01
TSB#1 8-030-10 with lifetime warranty
Recall campaign #K01 applies to California certified
vehicles. TSB#1 8-01 7-10 with lifetime warranty
applied to federal certified vehicles.
1 Formerly known as Appendix D, this table lists specific vehicle makes and models -with OBD readiness issues along -with re solutions for I/M
programs to use at their discretion to overcome those issues.
Page 1 of 5                                                                                         Revised June 2012

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OBD ReadinessTestability Issues1
Make
Dodge
Dodge
Eagle
Eagle
Eagle
Ford
Ford
Hyundai
Hyundai
Infiniti
Jeep
Jeep
Maserati
Mitsubishi
Model
Year
2007 built
prior to
01/06/07
2010 built
prior to
2/20/10
1996 built
prior to
11/21/95
1996
1996-8
2000-2002
2003
2002
2003
1996
2005-6
2010-11
built before
09/02/10
2005+
1996-1998
Model
Ram Chassis
Cab with
Cummins 6.7L
diesel engine
Charger,
Challenger
with 3.5L
engine and 5-
speed
automatic
transmission
Vision, Non-
turbo Talon
Summit,
Summit
Wagon
Talon with
2.0L Turbo
All
Focus
Sonata
Tiburon
All models
Wrangler
Wrangler with
3.8L engine
All models
All models
Problem
Trucks are not
equipped with
oxygen sensors but
oxygen sensor and
oxygen sensor heater
monitors may report
as not ready.
Comprehensive
component monitor
status may not be set
to ready
Evaporative leak
detection monitor
may not set to ready
All monitors reset to
incomplete upon
every ignition key-off
All monitors reset to
incomplete upon
every ignition key-off
All monitors reset to
incomplete upon
every ignition key-off
Evap monitors may
be difficult to
complete
Monitors may be
difficult to complete
Monitors are difficult
to complete; perform
drive cycle 2 times
Will not communicate
with generic OBD
test equipment
Catalyst and
evaporative system
monitors are difficult
to complete
Oxygen sensor
heater readiness
status bit remains
incomplete.
Downstream oxygen
sensor monitor may
not set to ready
VIN may not display
properly on hand
held scan tools
Some monitors are
difficult to complete
Action
Recall campaign #K01 applies to California certified
vehicles. TSB#1 8-01 7-10 with lifetime warranty
applied to federal certified vehicles.
TSB# 18-008-10 Revision A
TSB #18-005-01 applies with a lifetime warranty
These vehicles are not reflashable and should be
tested without regard to monitor readiness.
These vehicles are not reflashable and should be
tested without regard to monitor readiness.
Follow recommended drive cycles. See OBD
clearinghouse. Otherwise test as normal.
Powertrain control module needs to be updated.
See TSB 06-7-5. Otherwise test as normal.
Follow drive cycle in TSB #02-36-030 applies.
Otherwise test as normal.
A manufacturer recall is in effect; recall campaign
#057 and Hyundai TSB #03-01-003-01. Otherwise
test as normal.
Follow drive cycle in TSB #NTB98-018, February
18, 1998. Otherwise test as normal.
TSB #25-001 -07
TSB #18-027-10
SeeTSB# MTB 148A Writing
Test without regard to readiness status.
Page 2 of 5
Revised June 2012

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OBD ReadinessTestability Issues1
Make
Mitsubishi
Nissan
Nissan
Plymouth
Saab
Saab
Subaru
Suzuki
Suzuki
Toyota/Lexus
Toyota
Volvo
Volvo
Volvo
Volvo
Model
Year
1998-2001
1996-1997
1999-2006
1996 built
prior to
11/21/95
1996-1998
1996-1998
1996
2001
2004
1996-2006
1996-1997
1996-1998
1996
2004-2006
2005-2007
Model
Montero,
Montero Sport,
Diamante,
3000GT,
Mirage,
Galant,
Expo/Expo
LRV, and
Eclipse
models
(except 2.0L
non— turbo
420A engine
models)
All models
All models
Breeze, Neon
900
(B234I with
Motronic 4.1)
All models
All models
Aerio
Forenza
All models
Tercel, Paseo
All models
excluding the
850 Turbo
850 Turbo
S40, V50
XC90
Problem
Some monitors are
difficult to complete
Catalyst and
evaporative system
monitors are difficult
to complete
Monitors can be
difficult to complete
All monitors reset to
incomplete upon
every ignition key-off
Monitors are difficult
to complete
Catalyst and
evaporative system
monitors are difficult
to complete
Readiness cleared at
key-off
Monitors can be
difficult to complete
Monitors can be
difficult to complete
Monitors can be
difficult to complete
Evaporative system
monitor will never
complete or is
unsupported
Catalyst and
evaporative system
monitors are difficult
to complete
Vehicle clears
readiness at key-off
Air conditioning
monitor mistakenly
set to supported
instead of
unsupported
Air conditioning
monitor mistakenly
set to supported
instead of
unsupported
Action
Follow recommended drive cycles in Mitsubishi
service manual. Otherwise, test as normal.
Follow recommended drive cycles. See Nissan TSB
#NTB98-018, January 3, 2002. Otherwise, test as
normal.
Follow owner's manual drive cycle to achieve
readiness. Otherwise, test as normal.
Recall campaign #678 applies to California certified
vehicles in California. TSB #18-005-01 applies to all
other vehicles with a lifetime warranty.
Saab Service Instruction No. 248 describes the
correct drive cycle for completion of the monitors.
Otherwise, test as normal.
The OBD readiness criteria for this vehicle allow
two monitors to be incomplete. Test as normal.
Scan vehicle for MIL illumination without regard to
readiness.
Follow drive cycle. See OBD Clearinghouse or
Suzuki service information.
Follow drive cycle. See OBD Clearinghouse or
Suzuki service information.
Follow drive cycles in Toyota service information.
The OBD readiness criteria for these model years
allow two monitors to be incomplete. Test as
normal.
Follow recommended drive cycles in Service
Bulletin 2-23-0056. Otherwise test as normal.
Scan for MIL illumination without regard to
readiness status. See Volvo SB-2-23-0056.
Ignore A/C monitor status and otherwise test as
normal.
Ignore A/C monitor status and otherwise test as
normal.
Page 3 of 5
Revised June 2012

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Flex Fuel Vehicle Testability Issues2
Model
Year
Model
Engine
Engine Family
and VIN
Problem
Action
Chrysler


1998


1999



2000


Chrysler Caravan
and Town and
Country/ Dodge
Caravan / Plymouth
Voyager
Chrysler Town and
Country/ Dodge
Caravan / Plymouth
Voyager
Chrysler Caravan,
Voyager, and Town
and Country / Dodge
Caravan / Plymouth
Voyager

^ ^l V R
/pQC\
(t^OD)

3.3L V-6
(E85)


3 3L V-6
(E851
{t^o^j)


WCRXT03.32BP
(VIN 8th digit: G)


XCRXT03.32BP
(VIN 8th digit: G)


YCRXT03.32BP
(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 EO-
E10 and coolant temp >230 deg. F;
• purge flow check.







Test without
regard to monitor






Ford



2002





Ford Ranger
2-wheel drive





3.0L V-6
(E85)




2FMXT03.02F6
(50 State)
(VIN 8th digit: V)


Monitors Disabled for operation >E10
blends: catalyst.

Desensitized evaporative leak/purge
check monitor to detect gross leak for
operation >E75 blends (monitor fully
compliant up to E75 blends).


Test without
regard to monitor
readiness


General Motors




2000







2001






Chevrolet S-10/GMC
Sonoma
2-wheel drive






Chevrolet S-10/GMC
Sonoma
2-wheel drive







2.2 L 1-4
(E85)






2.2 L 1-4
(E85)






YGMXT02.2121
YGMXT02.2122
(VIN 8th digit: 5)






1GMXT02.2122
(VIN 8th digit: 5)



System monitors disabled for
operation >E15 blends: O2 sensor
heater, secondary air, catalyst.
System monitors disabled for
operation >E10 blends: evaporative
leak check.
Desensitized O2 sensor monitor
implemented; only reports faults during
operation E15 blends: O2 sensor
heater, secondary air, catalyst.
System monitors disabled for
operation >E10 blends: evaporative
leak check.
Desensitized O2 sensor monitor
implemented; only reports faults during
operation 
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Flex Fuel Vehicle Testability Issues2
Model
Year
2002
Model
Chevrolet S-10/GMC
Sonoma
2-wheel drive
Engine
2.2 L I-4
(E85)
Engine Family
and VIN
2GMXT02.2122
(VIN 8th digit: 5)
Problem
System monitors disabled for
operation >E15 blends: O2 sensor
heater, secondary air, catalyst.
System monitors disabled for
operation >E10 blends: evaporative
leak check.
Desensitized O2 sensor monitor
implemented; only reports faults during
operation 
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