ENGINE IMMOBILISER SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


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


  • *: Using the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS

    Tech Tips


    • When 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.

    2. Clear 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, multiplex communication system DTC or entry and start system (start function) DTC by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      SFI system DTC output recurs A
      Engine immobiliser system DTC output recurs B
      Steering lock system DTC output recurs C
      Multiplex communication system DTC output recurs D
      Entry and start system (start function) DTC output recurs E
      DTC output does not recur F

      A

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      B

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      C

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      D

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      E

      Go to DIAGNOSTIC TROUBLE CODE CHART Click here

      F

  6. PROBLEM SYMPTOMS TABLE


    1. Refer to Problem Symptoms Table Click here.

      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. REPAIR OR REPLACE


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  9. CONFIRMATION TEST


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    END