How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

Troubleshoot in accordance with the procedure on the following pages.

VEHICLE BROUGHT IN
- GO TO NEXT STEP
CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See CUSTOMER PROBLEM ANALYSIS CHECK )
- GO TO NEXT STEP
INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN)
1. Check that there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with the hand-held tester.
  1. (ECU unconnected, communication line abnormal) Without code outputs, proceed to "A".
  2. (ECU unconnected, communication line abnormal) With code outputs, proceed to "B".
B: GO TO MULTIPLEX COMMUNICATION SYSTEM (See MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS )

A: Go to next step.
DIAGNOSTIC TROUBLE CODE CHECK (See DIAGNOSTIC TROUBLE CODE CHART )
1. Check a DTC and note it if a code is output.
2. Delete the DTC.
3. Check if the DTC will be output once again, when the problem symptom is simulated based on the noted code.
  1. Without an output of the code, proceed to "A".
  2. With an output of the code, proceed to "B".
B: Go to step 7

A: Go to next step.
PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
1. Without an applicable symptoms table, proceed to "A".
2. With an applicable symptoms table, proceed to "B".
B: Go to step 7

A: Go to next step.
ACCORDING TO PROBLEM SYMPTOM, PERFORM TROUBLESHOOTING
On-vehicle inspection (See ON-VEHICLE INSPECTION )
1. Pre-check (See PRE-CHECK )
  1. Inspection with the hand-held tester (ECU data list)
  2. Inspection with the hand-held tester (Active test)
2. Terminals of ECU (See TERMINALS OF ECU )
ADJUSTMENT, REPAIR OR REPLACE

END