How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2009 Lexus IS F. 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.
*: Use the Techstream

VEHICLE BROUGHT TO WORKSHOP
NEXT: Go to next step

CHECK FOR DTC*

Check for DTCs and note any codes that are output. Refer to DTC CHECK / CLEAR .
Clear the DTC.

Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

Result

Result	Proceed to
DTC does not reoccur	A
DTC reoccurs	B

B → GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART

A: Go to next step

OVERALL ANALYSIS AND TROUBLESHOOTING
1. Terminals of ECU. Refer to TERMINALS OF ECU .
  NEXT: Go to next step
REPAIR OR REPLACE
NEXT: Go to next step
CONFIRMATION TEST
NEXT → END