How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2007 Lexus RX 350. 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.

Fig 1: Identifying ECU Communication Diagram (2 Of 2)
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VEHICLE BROUGHT TO WORKSHOP
DTC CHECK
1. Check for DTCs and note any codes that are output (See DTC CHECK/CLEAR ).
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 DTC TABLE

A: Go to Next Step
OVERALL ANALYSIS AND TROUBLESHOOTING
1. See SYSTEM DIAGRAM
2. See TERMINALS OF ECU
ADJUST, REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END