Toyota AVENSIS 1999 Supplement Manual page 27

IN–22
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.
D Diagnostic trouble code displayed
D Problem symptoms exist
Troubleshooting of problem indicated
by diagnostic trouble code
INTRODUCTION
Diagnostic trouble code check
Making a note of and clearing of the diagnostic trouble codes displayed
Diagnostic trouble code check
D Normal code displayed
D Problem symptoms exist
– HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
Symptom confirmation
Problem symptoms
exist
Simulation test using the symptom
simulation methods
Troubleshooting of each
problem symptom
No problem symptoms
exist
D Normal code displayed
D 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–29).