Current through Register Vol. 41, No. 3, September 23, 2024
A. The
ASM equipment shall be in proper operating condition according to the
manufacturer's instructions prior to initiating a test.
1. The vehicle shall be maneuvered onto the
dynamometer with the drive wheels positioned on the dynamometer rolls. Prior to
test initiation, the rolls shall be rotated until the vehicle laterally
stabilizes on the dynamometer. Vehicles that cannot be stabilized on the
dynamometer shall be rejected from testing. Drive wheel tires shall be dried if
necessary to prevent slippage.
2.
Prior to initiating the ASM exhaust test procedure:
a. Vehicles that are also required to receive
OBD testing shall be connected to the appropriate test equipment and vehicle
and analyzer system manufacturer instructions.
b. The OBD test, if applicable, shall be
performed prior to the ASM test.
3. When ambient temperatures exceed 72°F,
testing shall not begin until the cooling fan is positioned and activated. The
cooling fan shall be positioned to direct air to the vehicle cooling system,
but shall not be directed at the catalytic converter.
4. Testing shall not begin until the vehicle
is properly restrained for ASM testing.
5. Testing shall not begin until the exhaust
ventilation system is properly functioning and attached or positioned as
necessary.
6. To ensure that the
motor vehicle and the dynamometer are in a warmed-up condition prior to
official testing, a 30-90 second preconditioning, as determined by the
department, shall be performed using the ASM 2525 load simulation.
7. Prior to each test or mode of a test, the
analyzer system shall automatically select the load setting of the
dynamometer.
8. Engine speed shall
be monitored by means of an RPM sensor and recorded in the test
record.
B. The test
sequence shall consist of first chance and, if applicable, second chance tests
in both ASM modes described in this section. Vehicles that fail the first
chance test as described within 150% of the standard shall receive a second
chance test. The department may increase this percentage to 200% when interim
or final standards take effect according to
9VAC5-91-170
B. The second chance test shall consist of a repetition of the mode or modes
that were failed in the first chance test. The department may eliminate the
need to do a second chance test if the vehicle has already failed an emissions
component check.
C. The ASM 2525
mode timer shall start when the dynamometer speed (and corresponding power) are
maintained at 25 ±1.0 miles per hour for five continuous seconds. If the
acceleration simulation exceeds the tolerance specified by the analyzer system
equipment manufacturer for more than five consecutive seconds after the mode
timer is started, the test mode timer shall be reset. Should this happen a
third time, the test shall be aborted and another started. The dynamometer
shall apply the required torque load for 25.0 mph at any testing speed within
the tolerance of 25 ±1.0 miles per hour (i.e., constant torque load over
speed range). The torque tolerance shall be ±5.0% of the correct torque
at 25 mph.
1. The analyzer system shall
automatically select the proper load setting for the dynamometer and test
standards, based on the Equivalent Test Weight (ETW) and the look-up table in
Part XIV (9VAC5-91-790
et seq.), using vehicle identification information.
2. If the dynamometer speed or torque falls
outside the speed or torque tolerance for more than two consecutive seconds, or
for more than five seconds total, the test mode time shall reset to zero and
resume timing. The minimum mode length shall be 45 seconds. The maximum mode
length shall be 90 seconds elapsed time.
3. During the 10 second period used for the
pass/fail decision, dynamometer speed shall not fall more than 0.5 mph
(absolute drop, not cumulative). If the speed at the end of the 10 second
period is more than 0.5 mph less than the speed at the start of the 10 second
period, testing shall continue until the speed stabilizes enough to meet this
criterion.
4. The pass/fail
analysis shall begin after an elapsed time of 30 seconds, which may include up
to 15 seconds of the preconditioning time period if the ASM 2525 torque and
speed tolerances are maintained. A pass or fail determination shall be made for
the vehicle and the mode shall be terminated as follows:
a. The vehicle shall pass the ASM 2525 mode
and the mode shall be immediately terminated if, at any point between an
elapsed time of 30 seconds and 90 seconds, the 10 second running average
measured values for each pollutant are simultaneously less than or equal to the
applicable test standards described in Part XIV (9VAC5-91-790
et seq.).
b. The vehicle shall fail
the ASM 2525 mode and the mode shall be terminated if subdivision C 4 a of this
section is not satisfied by an elapsed time of 90 seconds.
5. Upon termination of the ASM 2525 mode, the
vehicle and dynamometer shall immediately begin a transition to the speed
required for the ASM 5015 mode. The dynamometer torque shall smoothly
transition during the transition period and shall automatically reset to the
load required for the ASM 5015 mode as specified in subdivision D 1 of this
section.
D. The ASM 5015
mode timer shall start when the dynamometer speed (and corresponding power) are
maintained at 15 ±1.0 miles per hour for five continuous seconds. If the
acceleration simulation exceeds the tolerance specified by the analyzer system
manufacturer for more than five consecutive seconds after the mode timer is
started, the test mode timer shall be reset. Should this happen a third time,
the test shall be aborted and another started. The dynamometer shall apply the
required torque for 15.0 mph at any testing speed within the tolerance of 15
±1.0 miles per hour (i.e., constant torque load over speed range). The
torque tolerance shall be ±5.0% of the correct torque at 15 mph.
1. The analyzer system shall automatically
select the proper load setting for the dynamometer and test standards, based on
the ETW and the look-up table in Part XIV (9VAC5-91-790
et seq.), using vehicle identification information.
2. If the dynamometer speed or torque falls
outside the speed or torque tolerance for more than two consecutive seconds, or
for more than five seconds total, the mode timer shall reset to zero and resume
timing. The minimum mode length shall be 40 seconds. The maximum mode length
shall be 90 seconds elapsed time.
3. During the 10 second period used for the
pass/fail decision, dynamometer speed shall not fall more than 0.5 mph
(absolute drop, not cumulative). If the speed at the end of the 10 second
period is more than 0.5 mph less than the speed at the start of the 10 second
period, testing shall continue until the speed stabilizes enough to meet this
criterion.
4. The pass/fail
analysis shall begin after an elapsed time of 30 seconds. A pass or fail
determination shall be made for the vehicle and the mode shall be terminated as
follows:
a. The vehicle shall pass the ASM
5015 mode if, at any point between an elapsed time of 30 seconds and 90
seconds, the 10-second running average measured values for each pollutant are
simultaneously less than or equal to the applicable test standards described in
Part XIV (9VAC5-91-790
et seq.). If the vehicle passed the ASM 2525 mode, the ASM 5015 mode shall be
terminated upon obtaining passing scores for all three pollutants.
b. The vehicle shall fail the first chance
ASM 5015 mode if subdivision D 4 a of this section is not satisfied by an
elapsed time of 90 seconds.
E. The inspector shall perform a second
chance test on vehicles which fail either mode of the previous test sequence as
follows:
1. If the vehicle fails the
first-chance test, the test timer shall reset to zero and a second-chance test
shall be performed, except as noted below. The second-chance test shall have an
overall maximum test time of 145 seconds if one mode is repeated, an overall
maximum time of 290 seconds if two modes are repeated.
2. If the vehicle failed only the ASM 2525
mode of the first chance test, then that mode shall be repeated upon completion
of the first chance ASM 5015 mode. The repeated mode shall be performed as
described in this section except that the provisions of subdivision C 5 of this
section shall be omitted.
3. If the
vehicle failed only the ASM 5015 mode of the first chance test, then the first
chance ASM 5015 mode shall not end at 90 seconds but shall continue for up to
180 seconds.
4. If the vehicle
failed both ASM 5015 and ASM 2525 modes of the first chance test, then the
vehicle shall receive a second-chance test for the ASM 2525 mode immediately
following the first chance ASM 5015 mode. If the vehicle fails the
second-chance ASM 2525 mode, then the vehicle shall fail the test, otherwise
the vehicle shall also receive a second-chance ASM 5015 mode test.
Statutory Authority: §
46.2-1180
of the Code of Virginia; § 182 of the Clear Air Act; 40 CFR Part 51,
Subpart S.
