How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

The intelligent tester can be used at steps 4, 5, 6 and 13.

VEHICLE BROUGHT TO WORK SHOP
CUSTOMER PROBLEM ANALYSIS
1. Confirm problem symptoms.
PROBLEM SYMPTOM CONFIRMATION
SYMPTOM DOES NOT OCCUR (GO TO STEP 4 )

SYMPTOM OCCURS (GO TO STEP 5 )
SYMPTOM SIMULATION
CHECK BODY MULTIPLEX COMMUNICATION SYSTEM
1. Check for the DTC output.
MULTIPLEX DTC OUTPUT (PROCEED TO "BODY MULTIPLEX COMMUNICATION SYSTEM")

NO MULTIPLEX DTC (GO TO STEP 6 )
DTC CHECK
MALFUNCTION CODE (GO TO STEP 7 )

NORMAL SYSTEM CODE (GO TO STEP 8 )
DTC TABLE
GO TO STEP 10
PROBLEM SYMPTOMS TABLE
TERMINALS OF ECU
CIRCUIT INSPECTION
IDENTIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END