If you take your vehicle for an
emissions test shortly after the
battery has been disconnected or
gone dead, it may not pass the test.
This is because of certain ‘‘readiness
codes’’ that must be set in the on-
board diagnostics for the emissions
systems. These codes are erased
when the battery is disconnected,
and set again only after several days
of driving under a variety of
conditions.
If the testing facility determines that
the readiness codes are not set, you
will be requested to return at a later
date to complete the test. If you must
get the vehicle retested within the
next two or three days, you can
condition the vehicle for retesting by
doing the following.
Make sure the gas tank is nearly,
but not completely, full (around
3/4).
Without touching the accelerator
pedal, start the engine, and let it
idle for 20 seconds.
Keep the vehicle in Park. Increase
the engine speed to 2,000 rpm, and
hold it there until the temperature
gauge rises to at least 1/4 of the
scale (about 3 minutes).Make sure the vehicle has been
parked with the engine off for 6
hours or more.
Make sure the ambient
temperature is between 40° and
95°F. Select a nearby lightly traveled
major highway where you can
maintain a speed of 50 to 60 mph
for at least 20 minutes. Drive on
the highway in D. Do not use the
cruise control. When traffic allows,
drive for 90 seconds without
moving the accelerator pedal.
(Vehicle speed may vary slightly;
this is okay.) If you cannot do this
for a continuous 90 seconds
because of traffic conditions, drive
for at least 30 seconds, then repeat
it two more times (for a total of 90
seconds).
Without touching the accelerator
pedal, let the engine idle for 20
seconds.
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CONTINUED
Testing of Readiness Codes
Emissions Testing
Technical Information
305
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