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Maintenance and care
199
If the vehicle’s powertrain system
or its battery has just been
serviced, the OBD-II system is
reset to a “not ready for I/M test“
condition. To ready the OBD-II
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 of
driving in stop and go, city-type
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.
31CMCen 3/25/99 3:45 PM Page 199