How To Proceed With Troubleshooting

HINT: 

• Use the following procedure to troubleshoot the smart key system.
• *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP 

   NEXT: Go to next step 

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:

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

   NEXT: Go to next step 

3. INSPECT AUXILIARY BATTERY VOLTAGE 
   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.

      NEXT: Go to next step 

4. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* 
   1. Use the Techstream to check if the CAN communication system is functioning normally.

      Result

      Result	Proceed to
      ECU connected, communication line is normal.	A
      ECU connected, communication line is malfunctioning.	B

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

      A: Go to next step 

5. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM (LIN)* 
   1. Use the Techstream to check if the LIN communication system (LIN) is functioning normally. Refer to DTC CHECK / CLEAR .

      Result

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

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

      A: Go to next step 

6. CHECK FOR DTC* 
   1. Check for DTCs and note any codes that are output.
   2. Clear the DTCs.
   3. Recheck for DTCs. Based on the DTCs output, try to cause the same engine immobiliser system DTC, wireless door lock control system DTC or smart key system (for start function) DTC to be output by simulating the symptoms indicated by the DTCs.

      Result

      Result	Proceed to
      DTC is not output.	A
      Engine immobiliser system DTC is output.	B
      Wireless door lock control system DTC is output.	C
      Smart key system (for start function) DTC is output.	D

      B → GO TO ENGINE IMMOBILISER SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 

      C → GO TO WIRELESS DOOR LOCK CONTROL SYSTEM SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 

      D → GO TO SMART KEY SYSTEM (for Start Function). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 

      A: Go to next step 

7. PROBLEM SYMPTOMS TABLE 
   1. 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 9 

      A: Go to next step 

8. OVERALL ANALYSIS AND TROUBLESHOOTING* 
   1. Operation Check. Refer to OPERATION CHECK 
   2. Data List / Active Test. Refer to DATA LIST / ACTIVE TEST 
   3. Terminals of ECU. Refer to TERMINALS OF ECU 

      NEXT: Go to next step 

9. REPAIR OR REPLACEMENT 

   NEXT: Go to next step 

10. CONFIRMATION TEST 

    NEXT → END