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Engine Immobilizer System - Diagnostics: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Description
      1. The ECM controls the function of the immobilizer system on the 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 a malfunction occurs in the immobilizer system, even though the security indicator lamp does not come on, DTCs can be checked. Therefore, when the immobilizer system seems to be malfunctioning, use the hand-held tester to check for a malfunction and repair it.

    2. Inspect the DLC3.

      The vehicles 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
    G02938801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    STANDARD

    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. DTC CHECK (USING HAND-HELD TESTER) 
    1. Check for DTCs.
      1. Connect the hand-held tester to the DLC 3.
      2. Turn the ignition switch to the ON position.
      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. Clear the DTCs from memory.
      1. Connect the hand-held tester to the DLC 3.
      2. Turn the ignition switch to the ON position.
      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.

    Fig 2: Checking DTC by Hand-held Tester
    G02938802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. DTC CHECK (USING SST CHECK WIRE) 

    HINT:

    Perform this procedure when a malfunction occurs in communication between ECM and transponder key ECU, and communication line.

    Fig 3: Checking Wire DTC Check Mode
    G02938803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check for DTCs.
      1. Using SST check wire, connect terminals TC and CG of the DLC3.
      2. Turn the ignition switch to the ON position.

        SST 09843-18040

      3. Read the DTCs from the blinking of the check engine indicator light.
        Fig 4: Identifying DLC3 Connector Terminal
        G02938804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Clear the DTCs from memory.
      1. Turn the ignition switch OFF.
      2. Disconnect the battery terminals or EFI fuse.
      3. Connect the battery terminals or EFI fuse, and then turn the ignition switch to the ON position.
      4. Check that the normal code is indicated after connecting the fuse.
    Fig 5: Checking Engine Indicator Light
    G02938805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. 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 DISPLAY

    Item Measurement Item/Display (Range) Normal Condition Diagnostic Note
    KEY SW Unlock warning switch signal/ ON or OFF ON: Key is in ignition key cylinder
    OFF: No key is in ignition key cylinder    		 -
    IG SW Ignition switch signal/ ON or OFF ON: Ignition switch is in ON or START position
    OFF: Ignition switch is OFF or in ACC position    		 -
    IMMOBILIZER Immobilizer system status/ SET or UNSET SET: Without key
    UNSET: Ignition switch ON    		 -
    RESPONSE Transponder chip data/ NG or OK NG: With no response
    OK: Those with a response    		 -
    FRAME Transponder chip data/ NG or OK NG: Data error
    OK: Data OK    		 -
    SERIAL NUMBER Transponder chip data/ NG or OK NG: Data error
    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/ NO MATCH or MATCH NO MATCH: Unmatched sub-key code is sent
    MATCH: Sub key code is sent    		  
    MASTER KEY Master key code signal/ NO MATCH or MATCH NO MATCH: 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 code registration/ NOT FUL or FULL NOT FUL: Possible to register more key codes more FULL: Impossible to register key code any more -
    +B Power source/ BREAK or NORMAL BREAK: Power source open Normal: Power source normal -
    ANTENNA COIL Transponder key amplifier coil condition/ NORMAL or FAIL Normal: Antenna coil is normal FAIL: Antenna coil is malfunctioning -
    G-CODE SUPPORT SUPPORT or NOT SUP - (1)
    G-CODE DECISION YES or NO - (2)
    (1)
    1. Diagnostic Note
      • If the engine does not start using the registered key while the display on the hand-held tester shows "SUPPORT", there may be a problem with the ECM and the transponder key ECU.
      • If the engine does not start using the registered key while the display on the hand-held tester shows "NON SUP", there may be a problem with the transponder key ECU.
    (2)
    1. Diagnostic Note
      • YES indicates that the registration of the ECU communication ID for the ECM and the transponder key ECU has been completed.
      • NO indicates that the registration of the ECU communication ID for the ECM and the transponder key ECU has not been completed.
  5. 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: 

    ITEM TEST DETAIL

    Item Test Details
    SECURITY INDIC Turn security indicator ON/OFF
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