ENGINE IMMOBILISER SYSTEM (w/ Smart Entry and Start System) HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedures to troubleshoot the engine immobiliser system.


  • The intelligent tester should be used in steps 5 and 7.


  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? Driving conditions, weather conditions
      How did it happen? Problem symptoms

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  3. INSPECT BATTERY VOLTAGE


    1. Measure the 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. CRANK ENGINE FOR MORE THAN 10 SECONDS


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  5. CHECK FOR DTCS


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

    2. Delete the DTCs.

    3. Recheck for DTCs. Based on the DTCs output above, try to duplicate the SFI system DTC, engine immobiliser system DTC, steering lock system DTC, or smart entry and start system (starting) DTC by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      SFI system DTC output recurs

      A

      Click here

      Engine immobiliser system DTC output recurs

      B

      Click here

      Steering lock system DTC output recurs

      C

      Click here

      Smart entry and start system (starting) DTC output recurs

      D

      Click here

      DTC output does not recur E

      A

      GO TO SFI SYSTEM (DTC CHART)
      B

      GO TO ENGINE IMMOBILISER SYSTEM (DTC CHART)
      C

      GO TO STEERING LOCK SYSTEM (DTC CHART)
      D

      GO TO SMART ENTRY AND START SYSTEM (STARTING) (DTC CHART)
      E

  6. PROBLEM SYMPTOMS TABLE

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

    A

    GO TO STEP 8
    B

  7. OVERALL ANALYSIS AND TROUBLESHOOTING


    1. DATA LIST/ACTIVE TEST Click here

    2. TERMINALS OF ECU Click here


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  8. ADJUST, REPAIR OR REPLACE


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  9. CONFIRMATION TEST


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    END