Equus 3130 - Scan Tool – OBD2 - Manual (Page 33)

OBD2 31
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The Scan Tool allows you to retrieve Monitor/System Status Infor-
mation to help you determine if the vehicle is ready for an Emissions
Test (Smog Check). In addition to retrieving Diagnostic Trouble Codes,
the Scan Tool also retrieves Monitor Run/Not Run status. This informa-
tion is very important since different areas of the state/country have dif-
ferent emissions laws and regulations concerning Monitor Run/Not Run
status.
Before an Emissions Test (Smog Check) can be performed, your vehi-
cle must meet certain rules, requirements and procedures legislated
by the Federal and state (country) governments where you live.
1. In most areas, one of the requirements that must be met before a
vehicle is allowed to be Emissions Tested (Smog Checked) is that
the vehicle does not have any Diagnostic Trouble Codes present
(with the exception of PENDING Diagnostic Trouble Codes).
2. In addition to the requirement that no Diagnostic Trouble Codes be
present, some areas also require that all the Monitors that a partic-
ular vehicle supports indicate a "Has Run" status condition before
an Emissions Check may be performed.
3. Other areas may only require that some (but not all) Monitors indi-
cate a "Has Run" status before an Emissions Test (Smog Check)
may be performed.
Monitors with a "Has Run" status indicate that all the
required conditions they needed to perform diagnosis
and testing of their assigned engine area (system) have
been met, and all diagnostic testing has completed suc-
cessfully.
Monitors with a "Has Not Run" status have not yet met
the conditions they need to perform diagnosis and test-
ing of their assigned engine area (system), and have not
been able to perform diagnostic testing on that system.
The green, yellow and red LEDs provide a quick way to help you deter-
mine if a vehicle is ready for an Emissions Test (Smog Check). Follow
the instructions below to perform the Quick Check.
Perform the Code Retrieval Procedure as described on page 22,
then interpret the LED indications as follows:
Interpreting I/M Readiness Test Results
1. GREEN LED - Indicates that all engine
systems are "OK" and operating nor-
mally (all Monitors supported by the
vehicle have run and performed their
self-diagnostic testing). The vehicle is
ready for an Emissions Test (Smog
Check), and there is a good possibility
that it can be certified.
Using the Scan Tool
I/M READINESS TESTING