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Diagnosis System

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. DESCRIPTION 
    1. Multiplex communication system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use Techstream to check for malfunctions and make necessary repairs.
  2. INSPECT BATTERY VOLTAGE 

    Standard

    11 to 14 V

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

  3. CHECK DLC3 
    1. The vehicle's ECU uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminal Identification
      GTY103674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 1Ω
      BAT (16) - Body ground Battery positive Always 11 to 14 V
      CANH (6) - CANL (14) CAN bus line Ignition switch off* 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch off* 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch off* 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch off* 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch off* 6 kΩ or higher
      NOTE:

      * Before measuring the resistance, leave the vehicle as it is for at least 1 minute and do not operate the ignition switch, or any other switches or the doors.

    2. If the result is not as specified, DLC3 may have a malfunction. Repair or replace the harness and connector.

      HINT: 

      • If communication is normal when the tester is connected to another vehicle, inspect DLC3 of 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 appropriate service information.
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