CLEARANCE SONAR SYSTEM > DIAGNOSIS SYSTEM

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DESCRIPTION

  1. DIAGNOSTIC SYSTEM
    When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the intelligent tester to the vehicle and reading various data output from the vehicle's clearance warning ECU.
    The clearance warning ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.
    To check the DTCs, connect the intelligent tester to the DLC3 on the vehicle. The intelligent tester enables you to erase the DTCs, activate the various actuators, and check the freeze frame data and Data List.



    2. C052361E54

  2. Check the DLC3.
    The clearance warning ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 matches the ISO 15765-4 format.

    Symbols
    (Terminal No.)
    		Terminal Description
    		Condition
    		Specified Condition
    SIL (7) - 5 (SG)
    		Bus "+" line
    		During communication
    		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)
    		HIGH-level CAN bus line
    		Engine switch off
    		54 to 67 Ω
    CANH (6) - Battery positive
    		HIGH-level CAN bus line
    		Engine switch off
    		1 MΩ or higher
    CANH (6) - CG (4)
    		HIGH-level CAN bus line
    		Engine switch off
    		3 KΩ or higher
    CANL (14) - Battery positive
    		LOW-level CAN bus line
    		Engine switch off
    		1 MΩ or higher
    CANL (14) - CG (4)
    		LOW-level CAN bus line
    		Engine switch off
    		3 KΩ or higher
    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 to the DLC3, turn the engine 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.
    1. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
    2. 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.