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Diagnosis System

  1. DIAGNOSIS SYSTEM 
    1. Inspect the battery voltage.

      Standard voltage: 

      11 to 14 V 

      If the voltage is below 11V, recharge the battery before proceeding.

    2. The vehicle's ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

      HINT:

      Connect the cable of Techstream to the DLC3, turn the ignition switch on (IG) and attempt to use Techstream. If the screen displays a communication error message, a problem exists on either the vehicle side or the tester side.

      Fig 1: Identifying DLC3 Connector Terminals
      G04976536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.

      If the communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.

      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      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 positive Always 9 to 14 V
      CANH (6) - CANL (14) CAN bus line Ignition switch OFF(1) 54 to 69 Ω
      CANH (6) - Battery positive HIGH-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or higher
      CANL (14) - Battery positive LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher
      CANL (14) - CG (4) 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.
  2. DIAGNOSIS 
    NOTE: When releasing the parking brake, set chocks to hold the vehicle for safety.
    1. Release the parking brake.
    2. Turn the ignition switch on (IG).
    3. If the skid control ECU detects a malfunction, the ABS warning light and brake warning light will come on to warn the driver. The table below indicates which light will come on when there is a malfunction in a particular function.
      Fig 2: Identifying ABS And Brake Warning Light Display
      G04977902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TROUBLE AREA CHART

      Item/Trouble Area ABS System EBD System Skid Control ECU
      ABS Warning light ◦ ◦ ◦
      Brake Warning light - ◦ ◦
      ◦: Light ON
      -: Light OFF
      • The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting the SST (09843-18040) between the TC and CG terminals of the DLC3 and observing the blinking pattern of the ABS warning light, or by connecting Techstream (See DTC CHECK / CLEAR  ).
      • This system has a sensor signal check function (See TEST MODE PROCEDURE  ).
  3. WARNING LIGHT INITIAL CHECK 
    NOTE: When releasing the parking brake, set chocks to hold the vehicle for safety.

    HINT:

    When the parking brake is applied or the level of the brake fluid is low, the brake warning light comes on.

    1. Release the parking brake.
    2. Check that the ABS warning light and brake warning light come on when the ignition switch is turned on (IG) and go off in approximately 3 seconds.
    3. If the warning lights do not come on or remain on, inspect the ABS warning light circuit and/or brake warning light circuit.
      TROUBLE AREA CHART

      Trouble Area See procedure
      ABS warning light circuit (Remains on) ABS WARNING LIGHT REMAINS ON 
      ABS warning light circuit (Does not come on) ABS WARNING LIGHT DOES NOT COME ON 
      Brake warning light circuit (Remains on) BRAKE WARNING LIGHT REMAINS ON 
      Brake warning light circuit (Does not come on) BRAKE WARNING LIGHT DOES NOT COME ON 
  4. SYMPTOM SIMULATION 

    HINT:

    The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be reproduced. No matter how experienced or skilled a technician may be, if he proceeds to troubleshoot without confirming the problem symptoms, he will likely overlook something important and make a wrong guess at some points in the repair operation. This leads to a standstill in troubleshooting.

    Fig 3: Identifying Simulation of ABS And Brake Warning Light Display
    G04977902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Vibration method: When vibration seems to be the major cause.

      HINT:

      Perform the simulation method only during the primary check period (for approximately 6 seconds after the ignition switch is turned on (IG)).

      1. Slightly vibrate the part of the sensor considered to be the problem cause with your fingers and check whether the malfunction occurs.
      2. Slightly shake the connector vertically and horizontally.

        HINT:

        Shaking the relays too strongly may result in open relays.

      3. Slightly shake the wire harness vertically and horizontally. The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly.
        Fig 4: Symptom Simulation Vibration Method
        G04977904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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