How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle Brought to Workshop
See CUSTOMER PROBLEM ANALYSIS .
Check Multiplex Communication System (See HOW TO PROCEED WITH TROUBLESHOOTING )
1. Check the DTC output.
1. DTC outputs (Proceed to MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS )
2. DTC does not output (Go to step 4 )
Problem Symptom Confirmation (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
1. Symptom does not occur (Go to step 5 )
2. Symptom occurs (Go to step 6 )
Symptom Simulation (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
(See DTC CHECK )
1. Normal code (Go to step 8 )
2. Malfunction code (Go to step 7 )
(See DTC TABLE )
Go to step 9
(See PROBLEM SYMPTOMS TABLE )
(See TERMINALS OF ECU )
Identification Problem
Repair or Replace
Confirmation Test
End