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The green, yellow and red LEDs provide a quick way to help you
determine if a vehicle is ready for an Emission Test.
The LED and audio tone indications are interpreted as below:
LED Interpretation
1)
GREEN LED
– Indicates that engine systems are “OK” and
operating normally (the number of Monitors supported by the
vehicle which have run and performed their self-diagnostic
testing is in the allowed limit. MIL is off. ).There are no stored
and pending DTCs. The vehicle is ready for an Emissions Test,
and there is a good possibility that it can be certified.
2)
YELLOW LED
– With MIL off, there may be three possible
conditions to cause the yellow LED to light.
If a “Stored” Diagnostic Trouble Code is causing the
Yellow LED to light, it is still possible that the vehicle will
be allowed to be tested for emissions and certified.
If a “Pending” Diagnostic Trouble Code is causing the
Yellow LED to light, it is still possible that the vehicle will
be allowed to be tested for emissions and certified.
If the illumination of the Yellow LED is being caused by
monitors that have not completed their diagnostic testing,
then the issue of the vehicle being ready for an Emissions
Test depends on the emissions regulations and laws of your
local area.
NOTE
: From the code retrieval procedure, determine the status of
each Monitor. Take this information to an emissions professional to
determine (based on your test results) if your vehicle is ready for an
Emissions Test.
