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Maintenance
and care
232
Readiness for inspection/
maintenance (I/M) testing
In some localities, it may be a legal
requirement to pass an I/M test of
the onĆboard diagnostics system
(OBDĆII). If your Check engine
light is on, refer to the description
in the Warning Lights and
Chimes section of the
Instrumentation chapter. Your
vehicle may not pass the I/M test
with the Check engine light on.
If the vehicle's powertrain system
or its battery has just been
serviced, the OBDĆII system is reset
to a not ready for I/M test"
condition. To ready the OBDĆII
system for I/M testing, a minimum
of 30 minutes of city and highway
driving is necessary as described
below:
• First, at least 10 minutes of
driving on an expressway or
highway.
• Next, at least 20 minutes driving
in stopĆandĆgo, cityĆtype traffic
with at least four 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.