Tenn. Comp. R. & Regs. 1200-03-29-.07 - MOTOR VEHICLE EMISSIONS PERFORMANCE TEST METHODS
(1) For gasoline powered motor vehicles, the
motor vehicle emissions performance test shall consist of the sampling of
exhaust emissions at idle speed and measurement of CO2
dilution, CO concentration and HC concentration.
(2) For gasoline powered motor vehicles,
sampling of exhaust emissions shall consist of measurement of
CO2 dilution, CO concentration and HC concentration
during idle operation using an approved exhaust gas analyzer. Measurements
taken during the initial idle phase may be succeeded by measurements taken
during a second idle phase which has followed an engine conditioning phase
consisting of engine operation at approximately 2500 RPM for approximately 20
seconds. The lowest emission readings from either of these idle speed test
phases shall be used to determine pass or failure of the emissions performance
test.
(3) For diesel powered motor
vehicles, the motor vehicle emissions performance test shall consist of the
Curb Idle test procedures for diesel vehicles:
(a) Diesel-powered vehicles shall be
inspected with an opacity meter that is a full-flow, direct reading, continuous
reading light extinction type using a collimated light source and
photo-electric cell, accurate to within plus or minus five (5)
percent.
(b) Separate measurements
shall be made on each exhaust outlet on diesel vehicles equipped with multiple
exhaust outlets. The reading taken from the outlet giving the highest reading
shall be used for comparison with the standard for the vehicle being
tested.
(4) For gasoline
powered motor vehicles with a model year of 1996 and newer and for diesel
powered motor vehicles with a model year of 2002 and newer, an onboard
diagnostic test shall be performed. All vehicles that have a readily accessible
OBD system shall be tested. The results of the test shall be used to determine
pass or failure of the vehicle.
Notes
Authority: T.C.A. ยงยง 68-201-105 and 4-5-201 et. seq.
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