How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORKSHOP
1. GO TO NEXT STEP
CUSTOMER PROBLEM ANALYSIS CHECK AND PROBLEM SYMPTOM CONFIRMATION
1. GO TO NEXT STEP
INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN)
1. Check there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with LEXUS 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".
1. B: MULTIPLEX COMMUNICATION SYSTEM, see DIAGNOSTICS TROUBLE CODE CHART .
2. A: GO TO NEXT STEP
CHECK DIAGNOSTIC TROUBLE CODE, 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".
1. B: GO TO STEP 7
2. A: GO TO NEXT STEP
PROBLEM SYMPTOMS TABLE, see PROBLEM SYMPTOMS TABLE .
1. Without an applicable problem symptom table, proceed to "A".
2. With an applicable problem symptom table, proceed to "B".
1. B: GO TO STEP 7
2. A: GO TO NEXT STEP
ACCORDING TO PROBLEM SYMPTOM, PERFORM TROUBLESHOOTING
1. PRE-CHECK, see PRE-CHECK .
  1. Inspection with LEXUS hand-held tester (ECU data monitor)
  2. Inspection with LEXUS hand-held tester (Active test)
2. TERMINAL OF ECU, see TERMINALS OF ECU .
3. INSPECTION, see INSPECTION .
ADJUSTMENT, REPAIR OR REPLACE
1. GO TO NEXT STEP
2. END