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Using the Diagnostic Tool
I/M READINESS TESTING
Craftsman 87702 55
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" status).
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 systems.
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 Diagnostic
Tool's screen). The Multifunction Indicator
(Check Engine) Lamp on the vehicle's
instrument panel will light steady. The
problem that is causing the red LED to
light must be repaired before an Emissions Test (Smog Check) can be
performed. It is also suggested that the vehicle be inspected/repaired
before driving the vehicle further.
4. Flashing Red and Yellow LEDs – Indicates that a "permanent"
code has been set, and one or more of the vehicle’s monitors has
failed its diagnostic testing. A "permanent" DTC can be cleared only
by the vehicle's computer following successful completion of the
monitor that caused the fault to set.
If the Red LED or flashing RED and YELLOW LEDs were obtained,
there is a definite problem present in the system(s). In these cases,
you have the following options.
Repair the vehicle yourself. If you are going to perform the
repairs yourself, proceed by reading the vehicle service manual
and following all its procedures and recommendations.
Take the vehicle to a professional to have it serviced. The
problem(s) causing the red LED to light must be repaired before
the vehicle is ready for an Emissions Test (Smog Check).
On some vehicle models, the computer will store non-emission
related DTCs. These DTCs will not command the MIL on since
they are not emission related. If the Diagnostic Tool retrieves
one of these types of codes, the MIL will not be commanded
on, and the Yellow LED on the Diagnostic Tool will be
illuminated. In most cases, these types of codes will not
prevent the Emissions Test from being performed.
Using the I/M Readiness Monitor Status to Confirm a Repair
The I/M Readiness Monitor Status function can be used (after repair of a
fault has been performed) to confirm that the repair has been performed
correctly, and/or to check for Monitor Run Status. Use the following
procedure to determine I/M Readiness Monitor Status:
1. Using retrieved Diagnostic Trouble Codes (DTCs) and code
definitions as a guide, and following manufacturer's repair
procedures, repair the fault or faults as instructed.
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