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Diagnosis System

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DLC3 
    1. The vehicle's ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
    Fig 1: Identifying DLC3 Connector Terminals (CANL And BAT)
    G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINALS COMMUNICATION CHART

    Terminal No. (Symbols) Terminal Description Condition Specified Condition
    4 (CG) - Body ground Chassis ground Always Below 1 Ω
    5 (SG) - Body ground Signal ground Always Below 1 Ω
    7 (SIL) - 5 (SG) Bus"+" line During transmission Pulse generation
    16 (BAT) - Body ground Battery positive Always 10 to 14 V
    6 (CANH) - 14 (CANL) CAN bus line Ignition switch OFF(1) 54 to 69 Ω
    6 (CANH) - 16 (BAT) HIGH-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher
    6 (CANH) - 4 (CG) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or higher
    14 (CANL) - 16 (BAT) LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher
    14 (CANL) - 4 (CG) LOW-level CAN bus line Ignition switch OFF(1) 200 Ω or higher
    (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

    If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

    HINT:

    Connect the cable of the intelligent tester to the DLC3, turn the ignition switch ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

    • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
    • If communication is still not possible 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. DIAGNOSIS SYSTEM 
    1. Warning light
      1. The tire pressure warning light blinks when there is any malfunction in the tire pressure warning system.
        NOTE: When the malfunction has been corrected, the tire pressure warning light does not come on.
    2. DTCs (Normal mode)
      1. DTCs are memorized in the tire pressure warning ECU and receiver. These DTCs can be read by checking the blinks of the tire pressure warning light or by using the intelligent tester (see DTC CHECK / CLEAR ).
      Fig 2: Locating Tire Pressure Warning Light
      G05197527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Test mode
      1. By switching from normal mode to test mode (input signal check), you can inspect the tire pressure warning antenna, each tire pressure warning valve and transmitter and each vehicle speed sensor (see TEST MODE PROCEDURE ).
  3. CHECK WARNING LIGHT 
    1. Turn the ignition switch ON.
    2. Check that the tire pressure warning light comes on for 3 seconds.

      If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning light circuit.

      TIRE PRESSURE SPECIFICATIONS

      Trouble Area See
      Tire pressure warning light circuit TIRE PRESSURE WARNING LIGHT CIRCUIT 
  4. TIRE PRESSURE WARNING LIGHT CHART 

    HINT:

    The table below indicates the state of the tire pressure warning light after the ignition switch is turned ON.

    Fig 3: Locating Tire Pressure Warning Light
    G05197528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TIRE PRESSURE SPECIFICATIONS

      Immediately after turning the ignition switch ON Always
    Warning light output pattern
    Turns on for 3 sec. Goes off Turns on Blinks (*1) Blinks (*2) Blinks (*3)
    Normal ◦ ◦ - - - -
    Low tire pressure ◦ - ◦ - - -
    System fail ◦ - - ◦ - -
    Test mode ◦ - - - ◦ -
    Initialization ◦ - - - - ◦
    ECU connector poorly connected - - ◦ - - -
    TC ground ◦ - - - - -

    *1: Comes on and goes off repeatedly at 0.5 second intervals.

    Fig 4: Identifying Blinking Pattern Of Tire Pressure Warning Light
    G05197529Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    *2: Comes on and goes off repeatedly at 0.125 second intervals.

    Fig 5: Checking Tire Pressure Warning Light Blinking Interval
    G05197530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    *3: Blinks 3 times (1 second on, 1 second off).

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