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4) Access the Computer for Testing
8
4
2
• Trouble codes are "read" by noting
which LED's are "ON" (4 LED system)
or by observing the flash pattern of a
single LED (1 LED system). These
LED's are mounted inside the
computer. They can be seen through a
"sight window" (an opening in the
computer housing) or reflected by a
small mirror in some cases.
• Remove any vehicle parts such as
kick panels or other plastic pieces
which would restrict access to the
LED sight window. Carefully turn back
the carpeting if necessary.
• The computer itself may have to be
removed from its mounting location.
– Make note of wire harness position
before moving computer. Harness
should be replaced in original
position when computer remounted.
– Do not disconnect any of the
wiring harness connectors which
plug into the computer. You may
lose stored trouble codes!
5) Have pencil, and paper on hand
• These are for writing down all the
codes.
This completes the vehicle preparation.
Proceed to "Reading Trouble Codes",
page 30.
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