AUTOMATIC TRANSAXLE SYSTEM DIAGNOSIS SYSTEM


  1. EURO-OBD (EUROPEAN SPEC)

    A0027DH

    When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, the vehicle must be connected to an OBD scan tool (complying with ISO 15765-4). Various data output from the vehicle's ECM can then be read.

    Euro-OBD regulations require that the vehicle's on-board computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:


    1. The emission control system components.

    2. The powertrain control components which affect vehicle emissions.

    3. The computer

    In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15765-4 are stored in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain stored in the ECM memory.

    To check DTCs, connect the GTS or an OBD scan tool to the Data Link Connector 3 (DLC3) of the vehicle.

    The scan tool displays DTCs, freeze frame data and a variety of engine data.

    The DTCs and freeze frame data can be cleared using the scan tool.

  2. NORMAL MODE AND CHECK MODE


    1. 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 as an option for technicians. In check mode, 1 trip detection logic is used for duplicating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent problems (GTS only).

  3. 2 TRIP DETECTION LOGIC


    1. 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 subsequent drive cycle, the MIL is illuminated (2nd trip).

  4. FREEZE FRAME DATA


    1. 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 stored at the time of a malfunction.

  5. CHECK DATA LINK CONNECTOR 3 (DLC3)


    1. Check the DLC3.

      Click here

  6. CHECK MIL


    1. The MIL is illuminated when the ignition switch is turned to ON (the engine is not running).

    2. The MIL turns off when the engine is started. If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.

      Tech Tips

      If the MIL is not illuminated when the ignition switch is turned to ON, check the MIL circuit.

      Click here