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IMPREZA(NA) A1830BE-A (ENGLISH)
Starting and operating
7-6
State emission testing (U.S. only)
At state inspection time, remember to tell your
inspection or service station in advance not to
place your Subaru AWD vehicle on a two-wheel
dynamometer. Otherwise, serious transmission
damage will result.
Some states have started using dynamometers in
their state inspection programs in order to meet their
obligation under federal law to implement stricter
vehicle emission standards to reduce air pollution
from cars. A dynamometer is a treadmill or roller-like
testing device that allows your car’s wheels to turn
while the car remains in one place. Depending on
the severity of a state’s air pollution problems, the
states must adopt either a “basic” or “enhanced”
vehicle emission inspection test. Normally, a portion
of the basic emission test consists of an emission
inspector inserting an analyzer probe into the
exhaust pipe of an idling vehicle for a short period
of time. States with more severe air pollution prob-
lems are required to adopt an enhanced vehicle
emission test. This test simulates actual driving
conditions on a dynamometer and permits more
accurate measurement of tailpipe emitted pollution
than the basic emission test.
The U.S. Environmental Protection Agency (EPA)
and states using two-wheel dynamometers in their
emission testing programs have EXEMPTED
Subaru AWD vehicles from the portion of the testing
program that involves a two-wheel dynamometer.
There are some states that use four-wheel
dynamometers in their testing programs. When
properly used, that equipment will not damage an
AWD Subaru vehicle.
Under no circumstances should the rear wheels be
jacked off the ground, nor should the driveshaft be
disconnected for state emission testing.
WARNING
Testing of an All-Wheel Drive vehicle must
NEVER be performed on a single two-wheel
dynamometer. Attempting to do so will result
in uncontrolled vehicle movement and may
cause an accident or injuries to persons
nearby.
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