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Engine Immobilizer System - Diagnostics: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Description

      The ECM controls the of immobilizer system's functions on this vehicle.

      Data of the immobilizer or Diagnostic Trouble Code (DTC) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When a trouble occurs in immobilizer, Malfunction Indicator Lamp (MIL) does not turn ON but DTC inspection is performed.

      Fig 1: Connecting Hand-Held Tester To DLC3
      G02642802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Therefore when there seems to be a trouble with immobilizer, use hand-held tester or SST (diagnosis check wire No. 2) to check and troubleshoot it.

    2. Inspect the DLC3.

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

    Fig 2: Identifying DLC3 Terminals
    G02642803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 your 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, there is a problem on the vehicle side or tool side.

    • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
    • If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.
  2. INSPECT DIAGNOSIS 
    1. Using hand-held tester:

      Check the DTC.

      NOTE: Hand-held tester only:
      When the diagnosis system is switched from normal mode to check mode, all 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 write them down.
      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 the DTCs and freeze frame data; write them down (for operating instructions, see the hand-held tester instruction book).
      5. See DIAGNOSTIC TROUBLE CODE CHART  to confirm the details of the DTCs.
      Fig 3: Connecting Hand-Held Tester To DLC3
      G02642804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Clear the DTC.

      The following operations will erase the DTCs and freeze frame data.

      1. Operating the hand-held tester to erase the codes (see hand-held tester instruction book for operating instructions).
      2. Disconnecting the battery terminals or EFI1 fuse.
  3. DATA LIST 

    HINT:

    Using the DATA LIST displayed on the hand-held tester, allows the value of the switch, sensor and actuator to be read. without removing any parts. 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: 

    TRANSPONDER KEY ECU TERMINAL NUMBER AND SPECIFIED CONDITION

    Item Measurement Item/Display (Range) Normal Condition
    KEY SW Unlock warning switch signal/ ON or OFF OFF: Key is in ignition key cylinder
    ON: No key is in ignition key cylinder
    IG SW Ignition switch signal/ ON or OFF OFF: Ignition switch is in OFF or ACC position
    ON: Ignition switch is in ON position
    IMMOBILISER Immobilizer system status/ SET or UNSET UNSET: Without key
    SET: Ignition switch ON
    RESPONSE Transponder chip data/ NG or OK OK: Data OK
    NG: Data error
    FRAME Transponder chip data/ NG or OK NG: Data error
    OK: Data OK
    SERIAL NUMBER Transponder chip data/ NG or OK OK: Data OK
    OK: Data OK
    ENCRYPT CODE Transponder chip data/ NG or OK NG: Data error
    OK: Data OK
    STATUS Transponder chip data/ NG or OK NG: Data error
    OK: Data OK
    BCC Transponder chip signal/ NG or OK NG: Incorrect data sending
    OK: Correct data sending
    SUB KEY Sub-key code signal/ NOMATCH or MATCH NOMATCH: Unmatched sub-key code is sent
    MATCH: Sub-key code is sent
    MASTER KEY Master key code signal/ NOMATCH or MATCH NOMATCH: Unmatched Master key code is sent
    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 codes
    FULL: Cannot register any more key codes
    +B Power source/ NORMAL or BREAK NORMAL: power source is normal
    BREAK: power source is malfunctioning
    ANTENNA COIL Antenna coil condition/ NORMAL or FAIL NORMAL: Antenna coil is normal
    FAIL: Antenna coil is malfunctioning
    G-CODE SUPPORT - NOT SUP/SUPPORT
  4. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV and actuator to be operated without removing any parts. Performing the ACTIVE TEST as a first step of troubleshooting is one way to shorten 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: 

    TRANSPONDER KEY ECU TERMINAL NUMBER AND SPECIFIED CONDITION

    Item Test Details
    SECURITY INDIC Turn security indicator ON/OFF
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