Diagnostic trouble code check
Making a note of and clear ing of the diagnostic trouble codes displayed
Symptom confirmation
No problem symptoms
exist
Problem symptoms
exist
Simulation test using the symptom
simulation methods
D
Normal code displayed
D
Problem symptoms exist
D
Normal code displayed
D
No problem symptoms exist
Diagnostic trouble code check
Troubleshooting of problem indicated
by diagnostic trouble code
D
Diagnostic trouble code displayed
D
Problem symptoms exist
System Normal
Troubleshooting of each
problem symptom
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-
nec t or s
IN--12
--
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
Taking into account the above points, a flow chart showing how to proceed with troubleshooting using the
diagnostic trouble code check is shown below. This flow chart shows how to utilize the diagnostic 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.
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