Toyota 2015 Prius, Owner'S Manual

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4-2. Maintenance
PRIUS_OM_OM47A17U_DVD_(U)
Emission inspection and maintenance (I/M) programs
Some states have vehicle emission inspection programs which
include OBD (On Board Diagnostics) checks. The OBD system moni-
tors the operation of the emission control system.
■
If the malfunction indicator lamp comes on
The OBD system determines that a problem exists somewhere
in the emission control system. Your vehicle may not pass the I/
M test and may need to be repaired. Contact your Toyota dealer
to service the vehicle.
■
Your vehicle may not pass the I/M test in the following situa-
tions:
●
When the 12-volt battery is disconnected or discharged
Readiness codes that are set during ordinary driving are
erased.
Also, depending on your driving habits, the readiness codes
may not be completely set.
●
When the fuel tank cap is loose
The malfunction indicator lamp comes on indicating a tempo-
rary malfunction and your vehicle may not pass the I/M test.
■
When the malfunction indicator lamp still remains on after
several driving trips
The error code in the OBD system will not be cleared unless the
vehicle is driven 40 or more times.
■
If your vehicle does not pass the I/M test
Contact your Toyota dealer to prepare the vehicle for re-testing.