How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus RX 400h. 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 intelligent tester should be used in step 2.

VEHICLE BROUGHT TO WORKSHOP

CHECK FOR DTC

Check for DTCs and note any codes that are output.
Delete the DTC.

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

Result

RESULT CHART

Result	Proceed to
DTC does not reoccur	A
DTC reoccurs	B

B : Go to step 4

A : GO TO NEXT STEP.

OVERALL ANALYSIS AND TROUBLESHOOTING
1. TERMINALS OF ECU
ADJUST, REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END