How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2008 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

CHECK FOR DTC*

Check for DTCs and note any codes that are output (See DTC CHECK / CLEAR ).
Clear the DTC.

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

Result

DTC RESULT REFERENCE

Result	Proceed to
DTC does not reoccur	A
DTC reoccurs	B

B: GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to Next Step

OVERALL ANALYSIS AND TROUBLESHOOTING
1. Terminals of ECU (See TERMINALS OF ECU )
REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END