How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the pre-collision system.
• The intelligent tester should be used in steps  2,  3,  4 and  6.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CHECK MULTIPLEX COMMUNICATION SYSTEM 
   1. Use the intelligent tester to check if the multiplex communication system is functioning normally.

      Result: 

      DTC RESULT
      
      

      DTC Condition	Proceed to
      DTC is not output	A
      DTC is output	B

   B: GO TO  DTC CHART 

   A: Go to Next step 

3. CHECK CAN COMMUNICATION SYSTEM 
   1. Use the intelligent tester to check for normally functioning of CAN communication system.
      1. Perform bus check (Communication malfunctioning DTC).
      2. Perform bus check (Communication Bus check).

         Result: 

         DTC RESULT
         
         

         DTC Condition	Proceed to
         DTC is not output	A
         DTC is output	B

   B: GO TO  DTC CHART 

   A: Go to Next step 

4. CHECK FOR DTC 
   1. Check for DTCs.
      1. Record the DTCs.
   2. Clear the DTCs.
   3. Recheck for DTCs.
      1. Attempt to duplicate the malfunction and check if the DTCs are output again (See DTC CHECK / CLEAR  ).

         Result: 

         DTC RESULT
         
         

         DTC Condition	Proceed to
         DTC is not output	A
         DTC is output	B
         No DTC is output, and malfunction cannot be duplicated or checked	C

   B: GO TO DTC CHART

   C: SYMPTOM SIMULATION 

   A: Go to Next step 

5. PROBLEM SYMPTOMS TABLE 
   1. If the result is not listed on the problem symptoms table, proceed to A.
   2. If the result is listed on the problem symptoms table, proceed to B.

   B: GO TO STEP  7

   A: Go to Next step 

6. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. DATA LIST/ACTIVE TEST (See DATA LIST / ACTIVE TEST  ).
   2. Terminals of ECU (See TERMINALS OF ECU  ).
7. ADJUST, REPAIR OR REPLACE 
8. CONFIRMATION TEST 

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