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Diagnosis System

  1. DESCRIPTION 
    1. Air conditioning system data and the Diagnostic Trouble Codes (DTCs) 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 troubleshooting.
  2. CHECK DLC3 

    The vehicle's ECM uses the 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 Terminals
    G04475011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DLC3 TERMINALS RESISTANCE SPECIFICATIONS

    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 1Ω
    SG (5) - Body ground Signal ground Always Below 1Ω
    BAT (16) - Body ground Battery positive Always 11 to 14 V
    CANH (6) - CANL (14) HIGH-level CAN bus line Power switch OFF(1) 54 to 67 Ω
    CANH (6) - Battery positive HIGH-level CAN bus line Power switch OFF(1) 1 MΩ or higher
    CANH (6) - CG (4) HIGH-level CAN bus line Power switch OFF(1) 3 MΩ or higher
    CANL (14) - Battery positive LOW-level CAN bus line Power switch OFF(1) 1 MΩ or higher
    CANL (14) - CG (4) LOW-level CAN bus line Power switch OFF(1) 3 MΩ or higher
    (1) NOTICE: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power 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 power 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 the tester.

    • If communication is normal when the tester is connected to another vehicle, inspect the 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 Service Department listed in the tester's instruction manual.
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