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Your vehicle may not pass the I/M test
if the service engine soon indicator is
on or not working properly (bulb is
burned out), or if the OBD-II system
has determined that some of the
emission control systems have not
been properly checked. In this case,
your vehicle is not ready for I/M
testing.
If the vehicle’s engine or transmission
has just been serviced, or the battery
has recently run down or been
replaced, the OBD-II system may
indicate that the vehicle is not ready
for I/M testing. To determine if the
vehicle is ready for I/M testing, turn
the ignition key to the on position for
15 seconds without cranking the
engine. If the service engine soon
indicator blinks eight times, it means
that the vehicle is not ready for I/M
testing; if the service engine soon
indicator stays on solid, it means that
the vehicle is ready for I/M testing.
The OBD-II system monitors the
emission control system during
normal driving. A complete check may
take several days. If the vehicle is not
ready for I/M testing, you may need
to perform the following driving cycle
consisting of mixed city and highway
driving:
Drive on an expressway or highway
for a steady 15 minutes, followed by
20 minutes of stop-and-go driving
with at least four 30-second idle
periods.
Allow the vehicle to sit for at least
eight hours without starting the
engine. Then, start the engine and
complete the above driving cycle. The
engine must warm up to its normal
operating temperature. Once started,
do not turn off the engine until the
above driving cycle is complete. If the
vehicle is still not ready for I/M testing,
you will have to repeat the above
driving cycle.
181
Fuel and Refueling
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