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Section 550 (Engine Immobilizer System - Diagnostics): Pre-Check

WARNING: This page is about a different car, the 2004 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  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 turn 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 vehicles ECM uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

      Fig 1: Identifying DLC3 Connector Terminal
      G02909698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TERMINAL SPECIFIC CONDITION CHART

      Terminal No. Condition Specified Condition
      7 (Bus + Line) - 5 (Signal ground) During communication Pulse generation
      4 (Chassis Ground) - Body ground Constant Below 1 Ω
      5 (Signal Ground) - Body ground Constant Below 1 Ω
      16 (B+) - Body ground Constant 10 to 14 V

      HINT:

      Connect the cable of the hand-held tester to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in 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. 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 changed from normal mode to check mode, all DTCs and freeze frame data recorded in normal mode will be erased. Before changing 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 instruction manual for the hand-held tester).
      2. Disconnecting the battery terminals or ECU-B fuse.
  3. DATA LIST

    HINT:

    Using the hand-held tester DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to shorten 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: 

      TERMINAL SPECIFIC CONDITION CHART

      Item Measurement Item/ Display (Range) Normal Condition
      KEYSW Unlock warning switch signal/ ON or OFF OFF: Key is in ignition key cylinder
      KEYSW Unlock warning switch signal/ ON or OFF ON: No key is in ignition key cylinder
      IGSW Ignition switch signal/ ON or OFF OFF: Ignition switch is in OFF or ACC position
      IGSW Ignition switch signal/ ON or OFF ON: Ignition switch is in ON position
      IMMOBILISER Immobilizer system status/ SET or UNSET UNSET: Without key
      IMMOBILISER Immobilizer 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/ NOMATCH 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 codes
      REG CODE SPACE Memory space for key codes registration/ NOT FUL or FULL FULL: Cannot register any more key codes
      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 hand-held tester ACTIVE TEST allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to shorten labor time. The DATA LIST can be displayed during the ACTIVE TEST.

    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: 

      TRANSPONDER KEY ECU ASSY

      Item Test Details
      SECURITY INDIC Turn security indicator ON/OFF
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