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Engine Immobilizer System - Diagnostics: Pre-Check

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

        Data of the immobiliser system and the Diagnostic Trouble Code (DTC) can be read in the Data Link Connector 3 (DLC3) of the vehicle. When a malfunction occurs in the immobiliser system, even though the security indicator lamp does not come on, DTCs can be checked. Therefore, when the immobiliser system seems to be malfunctioning, use the hand-held tester to check for a malfunction and repair 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 Terminals
      G03009949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      7 (Bus + line) - 5 (Signal ground) During communication Pulse generation
      4 (Chassis ground) - Body ground Always Below 1 Ω
      5 (Signal ground) - Body ground Always Below 1 Ω
      16 (B+) - Body ground Always 9 to 14 V

      HINT:

      If the screen displays UNABLE TO CONNECT TO VEHICLE after you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and used 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 another 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 DTC 
    1. Checking DTCs.
      1. Connect the hand-held tester to the DLC 3.
        2. Fig 2: Connecting Hand-Held Tester To DLC 3
        G03009950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch ON.
      3. Read the DTCs by following the prompts on the tester screen.

        HINT:

        Refer to the hand-held tester operator's manual for further details.

    2. Clearing the DTCs from memory.
      1. Connect the hand-held tester to the DLC 3.
      2. Turn the ignition switch ON.
      3. Erase the DTCs by following the prompts on the tester screen.

        HINT:

        Refer to the hand-held tester operator's manual for further details.

  3. DATA LIST 

    HINT:

    Using the DATA LIST displayed on 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: 

      DATA LIST (TRANSPONDER KEY ECU)

      Item Measurement Item/Display (Range) Normal Condition
      KEY SW Unlock warning switch signal/ON or OFF OFF: Key is in Ignition key cylinder
      KEY SW Unlock warning switch signal/ON or OFF ON: No key is in Ignition key cylinder
      IG SW Ignition switch signal/ON or OFF OFF: Ignition switch is ON or START position
      IG SW Ignition switch signal/ON or OFF ON: Ignition switch is OFF or ON position
      IMMOBILISER Immobiliser system status/SET or UNSET UNSET: Without key
      IMMOBILISER Immobiliser system status/SET or UNSET SET: Ignition switch ON
      RESPONSE Transponder chip data/NG or OK NG: Data error
      RESPONSE Transponder chip data/NG or OK OK: Data OK
      FRAME Transponder chip data/NG or OK NG: Data error
      FRAME Transponder chip data/NG or OK OK: Data OK
      SERIAL NUMBER Transponder chip data/NG or OK NG: Data error
      SERIAL NUMBER Transponder chip data/NG or OK OK: Data OK
      ENCRYPT CODE Transponder chip data/NG or OK NG: Data error
      ENCRYPT CODE Transponder chip data/NG or OK OK: Data OK
      STATUS Transponder chip data/NG or OK NG: Data error
      STATUS Transponder chip data/NG or OK OK: Data OK
      BCC Transponder chip signal/NG or OK NG: Incorrect data sending
      BCC Transponder chip signal/NG or OK OK: Correct data sending
      SUB KEY Sub key code signal/NO MATCH or MATCH NOMATCH: Unmatched sub-key code is sent
      SUB KEY Sub key code signal/NOMATCH or MATCH MATCH: Sub key code is sent
      MASTER KEY Master key code signal/NOMATCH or MATCH NOMATCH: Unmatched Master key code is sent
      MASTER KEY Master key code signal/NOMATCH or MATCH MATCH: Master key code is sent
      REGIST SUB CODE Number of registered sub-key/min. 0, max. 15 Number of registered sub-key
      REGIST MAS CODE Number of registered master key/min. 0, max. 15 Number of registered master key
      REG CODE SPACE Memory space for key codes registration/NOT FUL or FULL NOT FUL: Possible to resister more key code
      REG CODE SPACE Memory space for key codes registration/NOT FUL or FULL FULL: Impossible to register key code any more
      ANTENNA COIL Antenna coil condition/NORMAL or FAIL Normal: Antenna coil is normal
      ANTENNA COIL Antenna coil condition/NORMAL or FAIL FAIL: Antenna coil is malfunctioning
  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: 

      DATA LIST (TRANSPONDER KEY ECU)

      Item Test Details
      SECURITY INDIC Turn security indicator ON/OFF
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