Diagnostic trouble code check
Making a note of and clearing of the diagnostic trouble codes displayed
Symptom confirmation
No problem symptoms
exist
Problem symptoms
exist
Simulation test using the symptom
simulation methods
Normal code displayed
Problem symptoms exist
Normal code displayed
No problem symptoms exist
Diagnostic trouble code check
Troubleshooting of problem indicated
by diagnostic trouble code
Diagnostic trouble code displayed
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-
nectors (see page
).
IN-26
-
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
26
Author:
Date:
2005 LEXUS IS300 (RM1140U)
Taking into account the points on the previous page, a flow chart showing how to proceed with troubleshoot-
ing 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.
