Toyota ZZT230 series, Repair Manual

Page: 28 / 821

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INTRODUCTION
-
HOW TOTROUB LESH OO TECUCONTROLLED
IN-23
SYSTEMS
Taking into account the points on the previous page, a flow chart showing how to proceed with troubleshoot·
lng using the diagnostic trouble code check is shown below. This flow chart shows how to utilize the diagnos·
tic trouble code check effectively, then by carefully checking the results, indicates how to proceed either to
diagnostic trouble code troubleshooting or to troubleshooting of problem symptoms table.
Diagnostic trouble code
Making a n
o
t
e of
and
clearing of
the
diagnostic trouble codes displayed
Symptom confirmation
Problem
N� problem symptoms
exist
SXISt
Simulation test using the symptom
simulation methods
Diagnostic trouble code check
•
Diagnostic trouble code displayed
•
Problem symptoms exist
Troubleshooting of problem indicated
by diagnostic
trouble code
•
Normal code displayed
•
Problem symptoms exist
Troubleshooting of each
problem symptom
•
Normal code displayed
•
No problem symptoms exist
System Normal
If a diagnostic trouble code was
displayed in the initial diagnostic
trouble code check, it indicates
that the trouble may have occurred
in a wire harness or connector
in
that circuit in the past. Therefore,
check the wire harness and con­
nectors (See page IN-30).