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4
and vehicle conditions. When a problem is detected, the OBD II
system turns on the Malfunction Indicator Light (MIL) on the
vehicle instrument panel to alert the driver typically by the phrase
of “Check Engine” or “Service Engine Soon”. The system will
also store important information about the detected malfunction
so that a technician can accurately find and fix the problem. Here
follows three valuable information:
(1) Whether the Malfunction Indicator Light (MIL) is
commanded “on” or “off”.
(2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored.
(3) Readiness Monitor status.
2.2 Diagnostic Trouble Codes (DTCs)
OBD II Diagnostic Trouble Codes are codes that are stored by the
on-board computer diagnostic system in response to a problem
found in the vehicle. These codes identify a particular problem
area and are intended to provide you with a guide as to where a
fault might be occurring within a vehicle. OBD II Diagnostic
Trouble Codes consist of a five-digit alphanumeric code. The first
character, a letter, identifies which control system sets the code.
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