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Diagnosis System

  1. DESCRIPTION 
    1. VSC system data can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.
    2. If the skid control ECU detects a malfunction, the ABS and BRAKE warning lights, and SLIP and VSC OFF indicator lights will turn on to warn the driver.
    3. DTCs can be read by connecting the intelligent tester to the DLC3, or connecting SST between terminals 13 (TC) and 4 (CG) of the DLC3.

      SST 09843-18040 

    4. Several DTCs can be stored in memory at one time.
    5. This system has a sensor signal check function (Test Mode).
      Fig 1: Identifying Warning Light And Indicator Light
      G05290598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TROUBLE AREA CHART

      Item / Trouble Area ABS EBD BA (Brake Assist) TRAC VSC
      ABS Warning Light ◦ ◦ ◦ - -
      Brake Warning Light - ◦ - - -
      VSC OFF Indicator Light ◦ ◦ ◦ ◦ ◦

      HINT:

      ◦: Light turns on

      -: Light does not turn on

  2. CHECK DLC3 
    1. The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
      Fig 2: Identifying DLC3 Connector Terminals
      G05290599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      BAT (16) - Body ground Battery positive Always 11 to 14 V
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF(1) 54 to 69 Ω
      CANH (6) - Battery positive (+) HIGH-level CAN bus line Ignition switch OFF(1) 1 MΩ or higher
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF(1) 1 MΩ or higher
      CANL (14) - Battery positive (+) LOW-level CAN bus line Ignition switch OFF(1) 1 MΩ or higher
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF(1) 1 MΩ or higher
      NOTE:
      (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 (with CAN VIM) 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 on 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.
        Fig 3: Connecting Intelligent Tester To DLC3
        G05290600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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