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Diagnosis System

  1. DESCRIPTION 

    The main body ECU stores trouble codes when trouble occurs on the vehicle.

    The diagnostic system allows for reading of the trouble codes from the DLC3.

    Use the intelligent tester to check and solve the problem.

  2. CHECK DLC3 
    1. The main body ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminals
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      DLC3 TERMINALS REFERENCE

      Symbols (Terminal 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 positive Always 11 to 14 V
      CANH (6) - CANL (14) CAN bus line Engine switch off(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Engine switch off(1) 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Engine switch off(1) 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Engine switch off(1) 6 kΩ or higher
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine 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.

    2. Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the engine switch on (IG) and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists in the vehicle or in the tester.
      • If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
        Fig 2: Connecting Intelligent Tester To DLC3
        G05251340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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