ENGINE IMMOBILISER SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use these procedures to troubleshoot the engine immobiliser system.

  • *: Use the intelligent tester.

  • If the ignition switch cannot be turned to ON, communication with the intelligent tester can be performed by connecting the intelligent tester to the vehicle and turning a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. INSPECT BATTERY VOLTAGE


    1. Measure the battery voltage.

      Standard voltage
      20 to 28 V

      If the voltage is below 20 V, recharge or replace the battery before proceeding.

      Tech Tips

      A simple method to determine whether the battery is depleted is to operate the horn.


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  3. CRANK ENGINE FOR MORE THAN 10 SECONDS


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  4. CHECK FOR DTCS*


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

    2. Clear the DTCs Click here.

    3. Recheck for DTCs. Try to duplicate the DTCs (ECD system and engine immobiliser system) by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      ECD system DTC is output B
      Engine immobiliser system DTC is output C

      B

      GO TO ECD SYSTEM Click here

      C

      GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

      A

  5. 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 7
      A

  6. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List / Active Test Click here.

    2. Terminals of ECU Click here.


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  7. ADJUST, REPAIR OR REPLACE


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  8. CONFIRMATION TEST


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    END