How To Proceed With Troubleshooting

HINT: 

• Use the following procedure to troubleshoot the pre-collision system.
• The Techstream should be used in steps 2, 3, 4 and 6.

1. VEHICLE BROUGHT TO WORKSHOP 

   NEXT: Go to next step 

2. CHECK MULTIPLEX COMMUNICATION SYSTEM 
   1. Use the Techstream to check if the multiplex communication system (MPX) is functioning normally.
      RESULT
      
      

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

      B → GO TO MULTIPLEX COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 

      A: Go to next step 

3. CHECK CAN COMMUNICATION SYSTEM 
   1. Use the Techstream to check if the CAN communication system is functioning normally.
      RESULT
      
      

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

      B → GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 

      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. Refer to DTC CHECK / CLEAR .
         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. Refer to  DIAGNOSTIC TROUBLE CODE CHART  

      C → GO TO SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 

      A: Go to next step 

5. PROBLEM SYMPTOMS TABLE 

   Refer to Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE .

   RESULT
   
   

   Result	Proceed to
   Fault is not listed in problem symptoms table	A
   Fault is listed in problem symptoms table	B

   B → Go to step 7 

   A: Go to next step 

6. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. Data List / Active Test. Refer to DATA LIST / ACTIVE TEST 
   2. Terminals of ECU. Refer to TERMINALS OF ECU 

      NEXT: Go to next step 

7. ADJUST, REPAIR OR REPLACE 

   NEXT: Go to next step 

8. CONFIRMATION TEST 

   NEXT → END