Using the Diagnostic Tool
CODE RETRIEVAL PROCEDURE
40 OBD2
The green, yellow and red LEDs are used (with the LCD
display) as visual aids to make it easier to determine
engine system conditions.
Green LED – Indicates that all
engine systems are “OK” and
operating normally. All monitors
supported by the vehicle have run
and performed their diagnostic
testing, and no trouble codes are
present. A zero will show on the
Diagnostic Tool’s LCD display, and
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 Diagnostic Tool’s
LCD display for confirmation.
A Pending code is confirmed
by the presence of a numeric
code and the word PENDING
on the Diagnostic Tool’s LCD
display.
B. MONITOR NOT RUN
STATUS – If the Diagnostic
Tool’s LCD 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 Diagnostic Tool’s LCD
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 (displayed on the
Diagnostic Tool’s screen). In this
case, the Multifunction Indicator
(Check Engine) lamp on the
vehicle’s instrument panel will be
illuminated.
