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

Tech Tips


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

  • Intelligent tester should be used in steps 5, 6, and 8.


  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. Try to duplicate the DTCs (SFI system and engine immobiliser system) by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      DTC (SFI system) recurs

      A

      Click here

      DTC (engine immobiliser system) recurs

      B

      Click here

      DTC does not recur C

      A

      GO TO SFI SYSTEM (DTC CHART)
      B

      GO TO ENGINE IMMOBILISER SYSTEM (DTC CHART)
      C

  6. READ VALUE ON INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Select Key SW in the Data List and read the tester display.

      Immobiliser (Transponder Key ECU):
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key SW Unlock warning switch signal/ON or OFF

      ON: Key is in ignition key cylinder

      OFF: No key is in ignition key cylinder

      		 -
      OK
      ON (Key is in ignition key cylinder) appears on the screen.

      NG

      GO TO DTC B2780
      OK

  7. 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 9
    B

  8. OVERALL ANALYSIS AND TROUBLESHOOTING


    1. DATA LIST / ACTIVE TEST Click here

    2. TERMINALS OF ECU Click here


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  9. ADJUST, REPAIR OR REPLACE


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  10. CONFIRMATION TEST


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    END