How To Proceed With Troubleshooting

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)

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. VEHICLE BROUGHT TO WORKSHOP 
2. 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 

3. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. See SYSTEM DIAGRAM 
   2. See TERMINALS OF ECU 
4. ADJUST, REPAIR OR REPLACE 
5. CONFIRMATION TEST 

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