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 with the power switch off.

      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. POWER SWITCH ON (IG)


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  5. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


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

      Result
      Result Proceed to
      ECU is connected, communication is normal A
      ECU is connected, communication is abnormal B

      B

      GO TO CAN COMMUNICATION SYSTEM Click here

      A

  6. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*


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

      Result
      Result Proceed to
      No DTC is output A

      DTC is output

      (DTC B2287, B2785, B2786 or B2789)

      		 B

      B

      GO TO LIN COMMUNICATION SYSTEM Click here

      A

  7. CHECK FOR DTCS (ENGINE IMMOBILISER SYSTEM)*


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

    2. Clear the DTCs Click here.

    3. Recheck for DTCs. Based on the DTCs output above, try to duplicate the engine immobiliser system DTC by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      No DTCs are output A
      Engine immobiliser system DTC is output B

      B

      GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

      A

  8. CHECK FOR DTCS (HYBRID CONTROL SYSTEM)*


    1. Clear the DTCs Click here.

    2. Recheck for DTCs.

      Tech Tips

      The DTCs for the engine immobiliser system are specified above. If other codes are output, check the DTC chart for the hybrid control system.

      Result
      Result Proceed to
      No DTCs are output A
      Engine immobiliser system DTC is output (DTC B2799, B279A or B279C) B
      Hybrid control system DTC is output (except DTC B2799, B279A and B279C) C

      B

      GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

      C

      GO TO HYBRID CONTROL SYSTEM Click here

      A

  9. PROBLEM SYMPTOMS TABLE


    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 11
      A

  10. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List / Active Test Click here

    2. Terminals of ECU Click here


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  11. REPAIR OR REPLACE


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  12. CONFIRMATION TEST


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    END