Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1989 emissions standards
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EMISSIONS STANDARDS
1988 Toyota Celica
1988 EMISSION & TUNE-UP STANDARDS
MANUFACTURING STANDARDS
Federal and state governments have established air quality
standard during the past 20 years. Automobile manufacturers design
their vehicles to conform to standards where the vehicle will be sold
and operated. These standards cover carbon monoxide (CO), hydrocarbons
(HC) and oxides of nitrogen (NOx).
Federal and California Standards which must be met by
manufacturers are specified in units easily measured in a testing
laboratory. Since 1970, these standards have been in "grams per mile".
This means no vehicle, whether 2-cylinder or V8, may emit more than a
set weight (in grams) of pollutants for each mile travelled. Since
large engines burn more fuel per mile than do small engines, they must
be "cleaner" per gallon burned if they are to meet these standards.
When manufacturers certify vehicle models prior to sale,
the vehicles are placed on a dynamometer and the exhaust gases are
collected in a bag. After the vehicle runs for a specified time, the
gases are analyzed and weighed. Engines and emission systems are
designed so the weight of emissions will be less than the specified
grams per mile standard.
Infra-red exhaust analyzers are commonly used in vehicle test
stations. The analyzer uses a test probe placed in the exhaust stream
to sample the exhaust gases, and measure the percentage of CO and the
parts per million of HC. These are not the same units used by the
manufacturer when the vehicle is certified. The NOx emissions cannot
be measured by an infra-red exhaust analyzer. Laboratory equipment
must be used to determine NOx emissions.
TUNE-UP STANDARDS
The technician must use the proper specifications when
adjusting the vehicle during a tune-up. The first few years of
emission-regulated vehicles were adjusted using an exhaust gas
analyzer which measured CO and HC.
In the past few years, manufacturers have produced much
cleaner running vehicles. The CO (percentage) and HC (ppm) have become
very low, especially when measured downstream of catalytic converter.
It has become difficult to measure the effect of fuel and ignition
adjustments.
One solution to this problem for vehicles using carburetors
requires the use of artificially-enriched propane adjustments. The
added propane increases or decreases engine RPM for evaluation of
carburetor rich/lean setting. This allows the technician to check
carburetor setting quickly and accurately.
As computer-controlled systems were developed, it became
possible for the vehicles to adjust the air/fuel ratio, ignition
timing and emission control device operation throughout the entire
driving range. These computer control systems use a variety of sensors
that provide the electronic control unit with information on vehicle
speed, altitude of vehicle operation and transmission gear position,
along with engine operating conditions.
Fuel delivery to achieve a lean air/fuel ratio is controlled
by the computer. The computer controls the on/off (duty cycle) time of
the fuel injector(s) or carburetor mixture control solenoid to achieve
leanest possible air/fuel ratio while maintaining good driveability.
Although most repair shops have exhaust gas analyzers,
computer-controlled vehicles normally do not have a CO and HC
specification for tuning. An abnormal exhaust gas reading on an
exhaust analyzer may be helpful in diagnosing a problem, but should
not be used as a basis for adjustments.
These procedures and specifications are supplied by the
manufacturer and may not list CO or HC specifications.
STATE TEST STANDARDS
Some states have established standards for allowable
pollutants for used vehicles. These standards are normally given in CO
(percentage) and HC (ppm). Vehicle tail-pipe emissions can be checked
against the standard using an exhaust gas analyzer. Typical standards
for newer vehicles would be 0.5 percent CO and 200 ppm HC. If vehicle
emissions are below this standard, vehicle would pass emissions test.
These standards are used to determine if the vehicle is running
properly, not to be used for tuning or adjusting the engine. If the
vehicle will not pass emission test or is running poorly, use the
manufacturer's diagnostic procedures and specifications for repair.
Test standards may change each year and vary from state to
state, and even by county within each state. It is not possible to
provide an accurate and up-to-date list of emissions standards.
Emission standards can be obtained for your area by contacting your
local county or state office. Remember, the emission standards are
only for test purposes. The manufacturer's adjustment procedures and
specifications must be followed when repairing vehicles.
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