ENGINE IMMOBILISER SYSTEM > HOW TO PROCEED WITH TROUBLESHOOTING

for Preparation Click here


HINT:
  1. Use these procedures to troubleshoot the engine immobiliser system.
  1. *: Use the intelligent tester.



1.VEHICLE BROUGHT TO WORKSHOP

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    2.CRANK ENGINE FOR MORE THAN 10 SECONDS

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      3.INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

      1. Using the intelligent tester, check if the Multiplex Communication System (MPX) is functioning normally (Click here).
        Result: 
        Result
        		Proceed to
        MPX DTC is not output
        		A
        MPX DTC is output
        		B



      		B.
      Go to MULTIPLEX COMMUNICATION SECTION
      A


      4.CHECK FOR DTC*

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

      2. Delete the DTC.

      3. Recheck for DTCs. Based on the DTCs output above, try to force output of the same SFI system DTC or engine immobiliser system DTC by simulating the symptoms indicated by the DTC.


        4. Result
        		Proceed to
        DTC output does not reoccur
        		A
        SFI system (3GR-FE) DTC output reoccurs
        		B
        SFI system (3GR-FSE) DTC output reoccurs
        		C
        SFI system (3UZ-FE) DTC output reoccurs
        		D
        Engine immobiliser system DTC output reoccurs
        		E


      		B.
      Go to SFI SYSTEM (3GR-FE)

      		C.
      Go to SFI SYSTEM (3GR-FSE)

      		D.
      Go to SFI SYSTEM (3UZ-FE)

      		E.
      Go to step 7
      A


      5.PROBLEM SYMPTOMS TABLE

        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

          NEXT

          END