ENTRY AND START SYSTEM (for Start Function) HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedure to troubleshoot the smart entry and start system (for start function).

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS CHECK

    Tech Tips


    • 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

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  3. INSPECT BATTERY VOLTAGE

    Standard voltage
    11 to 14 V

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


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  4. CHECK CAN COMMUNICATION SYSTEM*


    1. Use the intelligent tester to check if the CAN communication system is functioning normally Click here.

      Result
      Result Proceed to
      CAN DTCs are not output A
      CAN DTCs are output B

      B

      Go To CAN COMMUNICATION SYSTEM Click here

      A

  5. CHECK LIN COMMUNICATION SYSTEM*


    1. Use the intelligent tester to check if the LIN communication system is functioning normally Click here.

      Result
      Result Proceed to
      LIN DTCs are not output A
      LIN DTCs are output B

      B

      Go To LIN COMMUNICATION SYSTEM Click here

      A

  6. CHECK FOR DTC*


    1. Check for DTC and note any codes that are output Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs.

      Result
      Result Proceed to
      DTCs do not reoccur A
      DTCs reoccur B

      B

      Go To DIAGNOSTIC TROUBLE CODE CHART Click here

      A

  7. INSPECT BASIC OPERATION


    1. for Automatic transaxle: Turn the engine switch on (START) and check that the engine starts normally. Make sure that the brake pedal is depressed and the shift lever is in P at this time. for Manual transaxle: Turn the engine switch on (START) and check that the engine starts normally. Make sure that the clutch pedal is depressed at this time.

    2. Check that the engine switch mode can be changed by pushing the engine switch.

      Tech Tips

      for Continuously Variable Transaxle:

      Without depressing the brake pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC), to on (IG), and back to off.

      With the brake pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status.

      for Manual transaxle:

      Without depressing the clutch pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC), to on (IG), and back to off.

      With the clutch pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status.

      OK
      Engine can start normally.

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  8. PROBLEM SYMPTOMS TABLE


    1. Refer to Problem Symptoms Table Click here.

      Result
      Result Proceed to
      Fault is not listed in the Problem Symptoms Table A
      Fault is listed in the Problem Symptoms Table B

      B

      Go to step 10
      A

  9. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List/Active Test Click here.

    2. Terminals of ECU Click here.


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  10. REPAIR OR REPLACE


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  11. CONFIRMATION TEST


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    END