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MIL (Malfunction Indicator Lamp) Status displays the
state of the vehicles computer module(s).
• MIL ON: Indicates that the
Malfunction Indicator Lamp on
vehicle should be ON indicating
a possible emissions problem.
√ If the MIL Status is ON and the MIL is not illuminated with
the engine running, then a problem exists in the MIL
• MIL OFF: Indicates the
Malfunction Indicator Lamp
should be off and there should
be no emission problems.
√ Some manufacturers will turn the MIL off if a certain
number of drive cycles occur without the same fault being
√ Diagnostic Trouble Codes related to a MIL are erased
from the computer’s memory after 40 warm-up cycles if
the same fault is not detected.