LIN COMMUNICATION SYSTEM > HOW TO PROCEED WITH TROUBLESHOOTING

for Preparation Click here

HINT:

1. Use the following procedure to troubleshoot the LIN communication system.
   

1. *: Use the intelligent tester.
   

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1. 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.
   
2. Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
   
3. The following 5 items are important points in problem analysis:
   



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

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1. Measure the auxiliary battery voltage with the power switch off.
   

   Standard Voltage:

   11 to 14 V
   

   If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.
   

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1. Using the intelligent tester, inspect the LIN communication function to ensure there are no malfunctions in the communication system (Click here).
   

   Result:

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

B.	GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
A

1. Refer to Problem Symptoms Table (Click here).
   

   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

1. Terminals of ECU (Click here)
   

2. Data List / Active Test (Click here)
   

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