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 IN TO WORKSHOP
1. Go To Next Step
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) With code outputs, proceed to "A".
  2. (ECU unconnected, communication line abnormal) Without code outputs, proceed to "B".
1. B: GO TO SECTION OF EACH SYSTEM
2. A: Go to next step
DIAGNOSTIC TROUBLE CODE CHECK (See DIAGNOSTICS 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. When no code is output (symptom check and simulation is possible), proceed to "A".
  2. When no code is output (symptom check and simulation is impossible), proceed to "B".
  3. When a code is output, proceed to C.
1. B: GO TO PROBLEM SIMULATION
2. C: Go to step 7
3. A: Go to next step
PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
1. Without applicable symptoms, proceed to A
2. With applicable symptoms, 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 )
2. TERMINAL OF ECU (See TERMINALS OF ECU )
ADJUSTMENT, REPAIR OR REPLACE
1. Go To Next Step
1. END