ENGINE IMMOBILISER SYSTEM (w/o Smart Key System) HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips

Use the following procedure to troubleshoot the engine immobiliser system.

*: Use the Techstream.

  1. VEHICLE BROUGHT TO WORKSHOP

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  2. CUSTOMER PROBLEM ANALYSIS

    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 for 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 (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

  6. CHECK FOR DTCS (SFI SYSTEM)*

    1. Clear the DTCs Click here.

    2. Recheck for DTCs.

      Tech Tips

      The DTCs for the engine immobiliser system are specified below. If other DTCs are output, check the DTC chart for the SFI system.

      Result
      Result Proceed to
      No DTCs are output A
      Engine immobiliser system DTC is output (DTC B2799, B279A or B279C) B
      SFI system DTC is output (except DTC B2799, B279A and B279C) (for 2AR-FE) C
      B

      GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

      C

      GO TO SFI SYSTEM Click here

      A

  7. READ VALUE USING TECHSTREAM*

    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Immobiliser / Data List.

    5. Read the Data List according to the display on the Techstream.

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

      ON: Key in ignition key cylinder

      OFF: No key in ignition key cylinder

      		 -
      OK
      On the Techstream screen, the item changes between ON and OFF according to the chart above.
      NG

      GO TO DTC B2780 Click here

      OK

  8. 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 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