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Engine Immobilizer System: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Description
      1. The ECM controls the function of the immobilizer system on this vehicle.

        Data of the immobilizer system and the Diagnostic Trouble Code (DTC) can be read in the Data Link Connector 3 (DLC3) of the vehicle. When trouble occurs in the immobilizer system, even though the security Indicator lamp does not come on, DTCs can be checked.

        Therefore, when there seems to be trouble with the immobilizer system, use the hand-held tester to check for trouble and troubleshoot it.

    2. Inspect the DLC3.

      The vehicle's ECM uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with the SAE J1962 and matches the ISO 9141-2 format.

      Fig 1: Identifying Dlc3 Connector Terminal
      G02625698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Fig 2: Tester No And Specified Condition Chart
      G02625699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If the display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and operated the hand-held tester, the problem may be on the vehicle side or the tester side.

      • If communication is normal when the tester is connected to other vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself, so consult the Service Department listed in the tester's instruction manual.
  2. CHECK DIAGNOSIS 
    1. Using the hand-held tester, check for DTC.
      NOTE: Hand-held tester only:
      When the diagnosis system is switched from the normal mode to the check mode, all the DTCs and freeze frame data recorded in the normal mode are erased. So before switching modes, always check the DTCs and freeze frame data, and make a note of them.
      1. Prepare the hand-held tester.
      2. Connect the hand-held tester to the DLC3 under the instrument panel lower pad.
      3. Turn the ignition switch ON and push the hand-held tester switch ON.
      4. Use the hand-held tester to check for DTCs and freeze frame data, and make a note of them (For operating instructions, see the hand-held tester instruction book).
      5. Confirm the details of the DTCs.
    2. Either of the following procedures will erase the DTCs and freeze frame data.
      1. Operating the hand-held tester to erase the codes (See the hand-held tester instruction book for operating instructions).
      2. Disconnecting the battery terminals or ECU-B fuse.
  3. DATA LIST 

    HINT:

    Using to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Read the DATA LIST, according to the display on the tester.

      Transponder key ECU assy: 

      DATA LIST CHART

      Item Measurement Item/Display (Range) Normal Condition Diagnostic Note
      KEY SW Unlock warning SW signal/ ON or OFF OFF: Key is in IG key cylinder ON: No key is in IG key cylinder -
      IG SW IG SW signal/ ON or OFF OFF: IG SW is ON or START position ON: IG SW is OFF or ON position -
      IMMOBILIZER Immobilizer system status/ SET or UNSET UNSET: Without key SET: Ignition switch ON -
      RESPONSE NG/OK - -
      FRAME NG/OK - -
      SERIAL NUMBER NG/OK - -
      ENCRYPT CODE NG/OK - -
      STATUS NG/OK - -
      BCC NG/OK - -
      SUB KEY NOMATCH/MATCH - -
      MASTER KEY NOMATCH/MATCH - -
      REGIST SUB CODE Number of registered master key/ min. 0, max. 15 Number of registered master key -
      REGIST MAS CODE Number of registered sub-key/ min. 0, max. 15 Number of registered sub-key -
      REG CODE SPACE NOT FUL/FULL - -
      ANTENNA COIL NORMAL/FAIL - -
  4. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST using the hand-held tester allows you to operate the relay, VSV, actuator, etc. without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten the labor time.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Perform the ACTIVE TEST, according to the display on the tester.

      Transponder key ECU assy: 

      ACTIVE TEST CHART

      Item Test Details Diagnostic Note
      SECURITY INDIC Turn security indicator ON/OFF Key reminder buzzer is installed in combination meter
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