Equus 3130 - Scan Tool – OBD2 - Manual (Page 34)

32 OBD2
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2. YELLOW LED - Determine from the Code Retrieval Procedure
(page 22) which of the two possible conditions is causing the yellow
LED to light.
■ If a "PENDING" Diagnostic Trouble
Code is causing the yellow LED to
light, it is possible that the vehicle will
be allowed to be tested for emissions
and certified. Currently, most areas
(states / countries) will allow an
Emissions Test (Smog Check) to be
performed if the only code in the vehi-
cle's computer is a "PENDING"
Diagnostic Trouble Code.
■ If the illumination of the Yellow LED is
being caused by monitors that “have
not run” their diagnostic testing, then
the issue of the vehicle being ready
for an Emissions Test (Smog Check)
depends on the emissions regula-
tions and laws of your local area.
- Some areas require that all Monitors indicate a "Has Run" sta-
tus before they allow an Emissions Test (Smog Check) to be
performed. Other areas only require that some, but not all,
Monitors have run their self-diagnostic testing before an
Emissions Test (Smog Check) may be performed.
- From the code retrieval procedure, determine the status of
each Monitor (a solid Monitor icon shows Monitor "Has Run"
status, a flashing Monitor icon indicates "Has Not Run" sta-
tus). Take this information to an emissions professional to
determine (based on your test results) if your vehicle is ready
for an Emissions Test (Smog Check).
3. RED LED - Indicates there is a problem
with one or more of the vehicle's sys-
tems. A vehicle displaying a red LED is
definitely not ready for an Emissions
Test (Smog Check). The red LED is also
an indication that there are Diagnostic
Trouble Code(s) present (displayed on
the Scan Tool's screen).
The
Multifunction Indicator (Check Engine)
Lamp on the vehicle's instrument panel will light steady. The prob-
lem that is causing the red LED to light must be repaired before an
Emissions Test (Smog Check) can be performed. It is also suggest-
ed that the vehicle be inspected/repaired before driving the vehicle
further.
If the Red LED was obtained, there is a definite problem present in
the system(s). In these cases, you have the following options.
Using the Scan Tool
I/M READINESS TESTING