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Diagnosis System

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DLC3 

    The tire pressure warning 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 TERMINAL REFERENCE

    Symbols (Terminals No.) Terminal Description Condition Specified Condition
    SIL (7) - SG (5) Bus '+' line During transmission Pulse generation
    CG (4) - Body ground Chassis ground Always Below 1 Ω
    SG (5) - Body ground Signal ground Always Below 1 Ω
    BAT (16) - Body ground Battery ground Always 11 to 14 V
    CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF 54 to 69 Ω
    CANH (6) - Body ground HIGH-level CAN bus line Ignition switch OFF 1 MΩ or higher
    CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF 1 MΩ or higher
    CANL (14) - Body ground LOW-level CAN bus line Ignition switch OFF 1 MΩ or higher
    CANH (6) - CG (4) LOW-level CAN bus line Ignition switch OFF 1 MΩ or higher

    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 Techstream to the DLC3, turn the ignition switch ON and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem wither with the vehicle or with the Techstream.

    • If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 on the original vehicle.
    • If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the Techstream itself. So consult the Service Department listed in the Techstream instruction service information.
  2. DIAGNOSIS SYSTEM 
    1. Warning light
      1. When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and comes on after 1 minute.
        NOTE: When the malfunction has been corrected, the tire pressure warning light does not turn on.
        Fig 2: Identifying Tire Pressure Warning Light
        G05584898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. DTCs (Normal mode)
      1. DTCs are memorized in the tire pressure warning ECU and read by the blinks of the tire pressure warning light or by using the Techstream (See DTC CHECK/CLEAR  ).
    3. Test mode
      1. By switching from normal mode into test mode (input signal check), you can inspect the tire pressure antenna and receiver, each tire pressure warning valve and transmitter, engine speed signal and vehicle speed sensor (See TEST MODE PROCEDURE  ).
  3. CHECK TIRE PRESSURE WARNING LIGHT 
    1. Turn the ignition switch ON.
    2. Check that the tire pressure warning light turns on for 3 seconds.

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

      SYMPTOM CHART

      Trouble Area See page
      Tire pressure warning light circuit TIRE PRESSURE WARNING LIGHT CIRCUIT 
      Fig 3: Identifying Tire Pressure Warning Light
      G05584898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.

    TIRE PRESSURE WARNING LIGHT CHART

      Immediately after turning the ignition switch ON Always
    Warning light output pattern
    Comes on for 3 seconds Goes off Comes on Blinks for 1 minute and then illuminates ((1)) Blinks ((2)) Blinks ((3)) Output DTC
    Normal ◦ ◦ - - - - -
    Low tire pressure ◦ - ◦ - - - -
    System fail ◦ - - ◦ - - -
    Test mode ◦ - - - ◦ - -
    ECU connector poorly connected ◦ - - ◦ ((4)) - - -
    TC ground (DTC is output) ◦ - - - - - ◦
    TC ground (DTC is not output) ◦ - - - - ◦ -
    (1) Comes on and goes off repeatedly at 0.5 second intervals, and comes on after 1 minute.
    (2) Comes on and goes off repeatedly at 0.125 second intervals.
    (3) Comes on and goes off repeatedly at 0.25 second intervals.
    (4) When determining if there is a short circuit (10 seconds), the light is off. Then it blinks at 0.5 second intervals, and comes on after 1 minute.
    Fig 4: Identifying Tire Pressure Warning Light - Blinking Pattern
    G05159672Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Identifying Tire Pressure Warning Light - Blinking Pattern
    G05159673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Identifying Tire Pressure Warning Light - Blinking Pattern
    G05389355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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