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Diagnosis System

  1. DESCRIPTION 
    1. Lighting system data and the Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use Techstream to check for malfunctions and perform repairs.
  2. CHECK DLC3 
    1. The 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
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      VOLTAGE AND RESISTANCE SPECIFICATION

      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 Ignition switch off(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch off(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch off(1) 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch off(1) 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition 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 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.

    2. Connect the cable of Techstream to the DLC3, turn the ignition switch on (IG) 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 Techstream.

      HINT:

      • If communication is normal when Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still not possible when Techstream is connected to another vehicle, the problem may be in Techstream itself. Consult the Service Department listed in Techstream's instruction manual.
  3. INSPECT BATTERY VOLTAGE 

    Standard voltage: 

    11 to 14 V 

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

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