How To Proceed With Troubleshooting

HINT:

• Use the following procedure to troubleshoot the LIN communication system.
• *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CUSTOMER PROBLEM ANALYSIS 

   HINT:

   • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
   • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
   • The following 5 items are important points in the problem analysis:
     PROBLEM SYMPTOMS CHART
     
     

     What	Vehicle, system name
     When	Date, time, occurrence frequency
     Where	Road conditions
     Under what conditions?	Driving conditions, weather conditions
     How did it happen?	Problem symptoms

3. INSPECT BATTERY VOLTAGE 
   1. Measure the battery voltage.

      Standard Voltage: 

      11 to 14 V 

      HINT:

      If the voltage is below 11 V, recharge or replace the battery before proceeding.

4. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* 
   1. Using the Techstream, inspect the LIN communication function to ensure there are no malfunctions in the communication system (See DIAGNOSIS SYSTEM ).

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      No DTCs output	A
      DTCs output	B

      B: Go to DIAGNOSTIC TROUBLE CODE CHART  (See DIAGNOSTIC TROUBLE CODE CHART )

      A: Go to Next Step 

5. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. Terminals of ECU (See TERMINALS OF ECU )
6. REPAIR OR REPLACE 
7. CONFIRMATION TEST 

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