How To Proceed With Troubleshooting

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

HINT:

Use this procedure to troubleshoot the multiplex communication system.
The hand-held tester should be used in step 2.

VEHICLE BROUGHT TO WORKSHOP
DTC CHECK (See DTC CHECK/CLEAR )
1. Check for DTCs and note any codes that are output.
2. Delete the DTC.
3. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.
  1. If the DTC does not reoccur, proceed to A.
  2. If the DTC reoccurs, proceed to B.
B: Go to step 4

A: Go to next step
OVERALL ANALYSIS AND TROUBLESHOOTING
1. Terminals of ECU (see TERMINALS OF ECU )
ADJUST, REPAIR OR REPLACE
CONFIRMATION TEST
END