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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. LIST OF OPERATION METHODS 
    1. By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.
      Fig 1: Identifying Operation Methods Flow List Diagram
      GTY171096Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK DLC3 
    1. The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

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

      Symbol (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* 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 is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

      HINT: 

      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.

      • 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 not possible when Techstream is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in Techstream instruction manual.
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