Matco Tools MD95 Operating Instructions Manual page 12

Using the Scan Tool
CODE RETRIEVAL PROCEDURE
In the case of long code definitions, a small arrow is shown in the
upper/lower right-hand corner of the Scan Tool display area to
indicate the presence of additional information.
If a definition for the currently displayed code is not available,
an advisory message shows.
12. Read and interpret Diagnostic Trouble Codes/system condition using
the display and the green, yellow and red LEDs.
The green, yellow and red LEDs are used (with the display) as
visual aids to make it easier to determine engine system
conditions.
Green LED – Indicates that all
engine
operating normally. All monitors
supported by the vehicle have run
and
testing, and no trouble codes are
present. All Monitor icons will be
solid.
Yellow LED – Indicates one of the
following conditions:
A. A PENDING CODE IS PRESENT – If
the yellow LED is illuminated, it may
indicate a Pending code is present.
Check the display for confirmation. A
Pending code is confirmed by the
presence of a numeric code and the
word PENDING.
B. MONITOR NOT RUN STATUS – If
the display shows a zero (indicating
there are no DTC's present in the
vehicle's computer memory), but the
yellow LED is illuminated, it may be
an indication that some of the
Monitors supported by the vehicle
have not yet run and completed their
diagnostic testing. Check the display
for confirmation. All Monitor icons that
are blinking have not yet run and
completed their diagnostic testing; all
Monitor icons that are solid have run
and completed their diagnostic testing.
Red LED – Indicates there is a
problem with one or more of the
vehicle's systems. The red LED is
also used to indicate that DTC(s)
are present. In this case, the
Malfunction Indicator (Check Engine)
lamp on the vehicle's instrument
panel will be illuminated.
10
systems are
performed their
"OK" and
diagnostic