Toyota Celica 2005 Repair Manual page 21

IN−20
HOW TO PROCEED WITH TROUBLESHOOTING
Carry out troubleshooting in accordance with the procedure on the following page. Here, only the basic pro-
cedure is shown. Details are provided in Diagnostics section, showing the most effective methods for each
circuit. Confirm the troubleshooting procedures first for the relevant circuit before beginning troubleshooting
of that circuit.
Vehicle Brought to Workshop
1
Customer Problem
Analysis
2
Symptom Confirmation
and Diagnostic Trouble
Code Check
4
Diagnostic Trouble
Code Chart
6
Circuit Inspection or Parts
Inspection
7
Repair
8
Confirmation Test
End
2005 CELICA (RM1131U)
INTRODUCTION
3
Symptom Simulation
5
Problem Symptoms Table
− HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
1
Ask the customer about the conditions and the
environment when the problem occurred.
2, 3
Confirm the symptoms and the problem conditions,
and check the diagnostic trouble codes.
(When the problem symptoms do not appear
during confirmation, use the symptom simulation
method described later on.)
4, 5, 6
Check the results obtained in Step 2, then confirm
the inspection procedure for the system or the part
which should be checked using the diagnostic
trouble code chart or the problem symptoms table.
7
Check and repair the affected system or part in
accordance with the instructions in Step 6.
8
After completing repairs, confirm that the problem
has been eliminated.
(If the problem is not reproduced, perform the
confirmation test under the same conditions and
in the same environment as when it occurred for
the first time.)
20
IN05W−46