Current through Register Vol. 48, No. 6, March 25, 2025
II.A. Model
year 2007 and older heavy duty vehicles with a GVW greater than 8500 pounds,
model year 2008 and newer heavy duty vehicles with a GVW greater than 14,000
pounds, and all 1981 and older model year vehicles to be inspected at a
licensed enhanced inspection centers in the enhanced program area shall be
administered an EPA approved idle short test as specified in 40 CFR, Part 51,
Subpart S, Appendix B.
II.A.1. The emissions
mechanic or emissions inspector will use a certified TAS to select the
appropriate idle short test cycle based upon the make, model year engine family
and vehicle classification. These idle short tests include, but may not be
limited to, a standard single speed idle test; the pre-idle 30-second
pre-conditioning idle test with the high speed (2500 ± 300 RPM)
pre-conditioning cycle before the idle mode; a standard two speed (3 - mode)
idle test with the raised idle segment at 2500 ± 300 RPM; second chance
raised idle pre-conditioning for 30 seconds just prior to the idle mode after
an initial failure, and second chance restart in which the ignition is turned
off for ten (10) seconds and then restarted to complete the emissions
inspection procedure. All sampling modes shall (each) be thirty seconds in
duration and raised engine speed modes be it for pre-conditioning or sampling,
shall be 2500 RPM ± 300 RPM. As a pass/fail determination, the vehicle's
emissions levels must be the same as or less than applicable limits at the
designated engine speed(s) in order to pass.
II.A.2. The entire vehicle shall be in normal
operating condition and at normal operating temperature, which shall be
determined by carefully feeling the top radiator hose while the engine is not
operating, by checking the temperature gauge, and/or operating the vehicle
prior to performing the idle emissions inspection. Vehicles are not to be idled
for extended periods of time but rather inspected in an expeditious manner as
soon as normal operating temperature is achieved. The vehicle shall be
inspected in an as-received condition.
II.A.3. The inspection shall be performed
with the transmission in park or neutral and with all accessories
off.
II.A.4. The analyzer probe
shall be inserted at least twelve (12) inches or as recommended by the analyzer
manufacturer for a quality sample whichever is greater.
II.A.5. For all vehicles equipped with a
multiple exhaust system, the analyzer's dual exhaust procedure must be
used.
II.A.6. If a baffle or screen
prevents probe insertion to an adequate depth, a suitable probe adapter or snug
fitting hose that effectively lengthens the exhaust pipe may be used.
II.A.7. The appropriate emissions limits
specified in Part F of this regulation would be utilized by the certified test
analyzer system. In selecting appropriate emissions limits, for motor vehicles
of model years 1978 and earlier having a gross vehicle weight (GVW) rating of
greater than 6000 lbs., or of model years 1979 and newer having a gross vehicle
weight rating of greater than 8500 lbs., the emissions mechanic or emissions
inspector shall identify that particular vehicle's GVW rating by examining the
vehicle information (metal) plate or sticker. These motor vehicles will be
subject to the applicable emissions limits as listed in Part F of this
regulation.
If the vehicle information plate or sticker is missing,
illegible or the GVW rating information is not otherwise available, the
emissions mechanic or emissions inspector shall examine the engine exhaust
emissions control information label which is permanently affixed to the engine
and determine heavy-duty engine/vehicle federal certification status. Vehicle
engines not labeled as having complied with applicable U.S. EPA heavy-duty
regulations by the manufacturer are assumed to be light-duty vehicles and
subject to the emissions limits listed in Part F of this regulation. Emissions
limits for vehicles in which the engine has been changed shall be based upon
whichever is newest, the vehicle or the replacement engine, as specified on a
vehicle evaluation form (DR2365) or bar coded label generated by emissions
technical center staff or designee.
II.A.8. In the event the tachometer over-ride
mode must be utilized to inspect a vehicle, an accurate auxiliary tachometer
must be used to verify engine speeds mandated in Part C, Section
II.A.1.
II.A.9. The vehicle will be
evaluated for the presence of visible smoke emissions. The evaluation is to be
performed during all (engine) operating conditions of the inspection procedures
prescribed in Part C, Sections II.A.1 through II.A.11.
II.A.10. A Certification of Emissions
Compliance shall be issued if the vehicle passes the emissions control systems
inspection (for 1975 and newer model year vehicles only), the exhaust and
evaporative emissions inspection, and there is no evidence of visible smoke
emissions.
II.A.11. If the vehicle
fails the initial emissions inspection the owner is to have appropriate
emissions related repairs or adjustments made and may return the vehicle to an
AIR Program station, facility or center, as appropriate, for reinspection.
Within ten (10) calendar days of the initial test, one free reinspection shall
be provided to the motorist if the vehicle is returned to the same station or
facility at which the initial test was performed. A motorist shall be entitled
to one free after-repairs test at any contractor operated center within ten
(10) calendar days of the initial test performed at a contractor operated
center. If during repairs, it is determined the necessary parts are not
available, the motorist may be issued a temporary Certificate of Emissions
Control by Department of Revenue personnel. Proof of part(s) non-availability
as described in Part C, Section III.D. of this part is required. Motorists
pursuing a temporary Certificate of Emissions Control must facilitate final
vehicle inspection and compliance with adopted regulation.
II.B. All model year 1982 and newer
light-duty vehicles, except vehicles required to be OBD tested pursuant to Part
C, Section II.C. to be inspected at licensed enhanced inspection centers within
the enhanced program area shall be administered an EPA approved transient
loaded mode inspection procedure as specified in 40 CFR, Part 51 Subpart S
Federal Register as amended to incorporated OBD testing August 6, 1996.
II.B.1. Vehicles shall be inspected in an
as-received condition.
II.B.2. The
inspection shall be performed with all accessories off.
II.B.3. The appropriate emissions limits as
specified in Part F of this regulation shall be selected by the TAS based upon
the model year and vehicle classification.
II.B.4. Light-duty vehicles of model year
1995 and older found to be safe but unable to be dynamometer tested shall be
administered an idle short test as specified in 40 CFR, Part 51, Subpart S,
Appendix B. OBD equipped light-duty vehicles that are unable to be tested on
the dynamometer shall be tested using the OBD test procedures in Part C,
Section II.C. to include meeting passing criteria in Part F, Section VII.
Eligibility for an alternative test procedure shall be determined by the
Division. The current eligibility list for an alternative test to the I/M 240
is maintained in the Air Pollution Control Division's Emissions Technical
Center Procedures Manual:II.B.5. Model year 2007 and older heavy duty vehicles
with a GVW greater than 8500 pounds and model year 2008 and newer heavy duty
vehicles with a GVW greater than 14,000 pounds to be inspected at licensed
enhanced inspection centers within the enhanced program area shall be
administered an appropriate EPA approved idle short test as specified in
Section II (A) of this Part C.
II.B.6. The inspector may refuse to conduct
the transient driving cycle dynamometer inspection procedure if the tires on
the drive wheels are worn such that the cords are visible or sidewalls are
peeling or blistered.
II.C. Light-duty vehicles, to include
light-duty trucks in their eighth through eleventh model year, all light-duty
vehicles, to include light-duty trucks of model year 1996 and newer that are
unable to be tested on an IM 240 test, and model year 2008 and newer heavy duty
vehicles with a GVW less than 14,000 pounds are to be inspected at licensed
enhanced inspection centers and shall be administered an EPA approved on-board
diagnostic test as specified in
40 CFR,
85.2222. 1996 and newer light-duty vehicles,
to include light duty trucks, that are owned by a fleet that operates a Fleet
Inspection Station shall be administered an EPA approved on-board diagnostic
test as specified in 40 CFR. 85.2222.
II.C.1.
Vehicles shall be inspected in an as-received condition.
II.C.2. The on-board diagnostic inspection
shall be conducted with the key-on/engine running.
II.C.3. The on-board diagnostic test analyzer
system shall determine what monitors are supported by the diagnostic system and
the readiness status for applicable monitors.
II.C.3.a. A readiness evaluation will ensure
that:
II.C.3.a.(i) The oxygen sensor and/or
heated oxygen sensor monitor(s) shall be ready if supported;
II.C.3.a.(ii) The catalyst monitor shall be
ready if supported, and;
II.C.3.a.(iii) A 2001 or newer model year
shall have no more than one (1) supported readiness monitor not ready;
or
II.C.3.a.(iv) A 2000 or older
model year shall have no more than two (2) supported readiness monitors not
ready.
If the readiness criteria are not met, and the malfunction
indicator light (MIL) is commanded off, the vehicle shall be subjected to an IM
240 emissions inspection immediately.
II.C.3.b. If the vehicle's on-board
diagnostics are unable to communicate electronically with the Colorado OBD Test
Analyzer System, the vehicle will be subjected to an IM 240 emissions
inspection immediately.
II.C.3.c.
The readiness requirement, outlined in this Part C, Section II.C.3.a. may be
waived to accommodate for specific vehicles with known readiness design
problems, in accordance with applicable technical service bulletins, EPA
guidance, or division technical findings, as approved by the
Division.
II.C.4. The OBD
test analyzer system shall evaluate the malfunction indicator light status and
record status information in the vehicle test record.
II.C.5. All diagnostic trouble codes
resulting in malfunction indicator light commanded-on status shall be recorded
in the vehicle test record.
II.C.6.
If the vehicle meets the passing criteria for the OBD inspection as listed in
Part F, Section VII. Of this regulation, the vehicle passes the on-board
diagnostic inspection.
II.C.7.
Vehicles in an OBD "not ready" status, or vehicles unable to communicate with
the OBD Test Analyzer System that default to an IM 240 test as described in
Part C, Section II.B. shall be subject to pass/fail for the applicable IM 240
pass/fail standards in Part F, Section III. of this regulation.
II.C.8. If the malfunction indicator light is
not commanded on and the vehicle passed the mil visual inspection, as outlined
in this Part C, Section III.B., the vehicle shall pass the on-board diagnostic
portion of the emissions inspection even if diagnostic trouble codes are
present.
II.C.9. The division may
require no more than five percent, at random, of all OBD tested light duty
vehicles to undergo an IM 240 test at the time of the OBD testing. The IM 240
test shall be the pass/fail determinant for these vehicles.
II.C.10. If the vehicle's OBD responds that
the catalyst readiness monitor is not supported or that all readiness monitors
are supported; or if any other OBD tampering indicators are present, as
determined by the Division and listed in the Division's Emissions Technical
Center Procedures Manual, then the OBD test will be FAILED and the vehicle
owner will be provided with a Vehicle Inspection Report.
