ECD SYSTEM (w/o DPF) DIAGNOSIS SYSTEM


  1. DESCRIPTION

    B007SX0

    When troubleshooting Euro-OBD vehicles, the vehicle must be connected to the GTS. Various data output from the vehicle's Engine Control Module (ECM) can then be read.

    The Malfunction Indicator Lamp (MIL) is illuminated when the vehicle's on-board computer detects a malfunction in the computer itself or in drive system components. In addition, the applicable Diagnostic Trouble Codes (DTCs) are recorded in the ECM memory Click here.

    When the malfunction does not reoccur, the MIL stays illuminated until the ignition switch is turned off, and the MIL turns off when the engine is started. Be aware that the DTCs remain recorded in the ECM memory.

    To check DTCs, connect the GTS to the DLC3 on the vehicle.

  2. NORMAL MODE AND CHECK MODE

    The diagnosis system operates in "normal mode" during normal vehicle use. In normal mode, "2 trip detection logic" is used to ensure accurate detection of malfunctions. "Check mode" is also available to technicians as an option. In check mode, "1 trip detection logic" is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions Click here.

  3. 2 TRIP DETECTION LOGIC

    When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the next subsequent drive cycle, the MIL is illuminated (2nd trip).

  4. FREEZE FRAME DATA

    The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  5. CHECK DLC3

    B007VS7E16

    The vehicle's ECM uses ISO 9141-2 (Euro-OBD) communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 9141-2 format.

    Terminal No. (Symbol) Terminal Description Condition Specified Condition
    7 (SIL) - 5 (SG) Bus "+" line During transmission Pulse generation
    4 (CG) - Body ground Chassis ground Always Below 1 Ω
    5 (SG) - Body ground Signal ground Always Below 1 Ω
    16 (BAT) - Body ground Battery ground Always 10 to 14 V
    6 (CANH) - 14 (CANL) CAN bus line Ignition switch off* 54 to 69 Ω
    6 (CANH) - 4 (CG) High-level CAN bus line Ignition switch off* 200 Ω or higher
    14 (CANL) - 4 (CG) Low-level CAN bus line Ignition switch off* 200 Ω or higher
    6 (CANH) - 16 (BAT) High-level CAN bus line Ignition switch off* 6 kΩ or higher
    14 (CANL) - 16 (BAT) 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.

    Tech Tips

    Connect the cable of the GTS to the DLC3, turn the ignition switch to ON and attempt to use the GTS. If the display informs that a communication error has occurred, there is a problem either with the vehicle or with the GTS.


    • If communication is normal when the GTS is connected to another vehicle, inspect the DLC3 on the original vehicle.

    • If communication is still not possible when the GTS is connected to another vehicle, the problem is probably in the GTS itself. Consult the Service Department listed in the GTS's instruction manual.

  6. INSPECT BATTERY VOLTAGE

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

  7. CHECK MIL


    1. B007SX0

      The MIL illuminates when the ignition switch is turned to ON and the engine is not running.

      Tech Tips

      If the MIL is not illuminated, check the MIL circuit Click here.

    2. When the engine is started, the MIL should turn OFF. If the lamp remains ON, the diagnosis system has detected a malfunction or abnormality in the ECD system.