SFI SYSTEM DIAGNOSIS SYSTEM

  1. EURO-OBD

    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 illuminates the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:

    A208456

    1. The emission control system components

    2. The powertrain control components (which affects vehicle emissions)

    3. The computer

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

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

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

      The DTCs and freeze frame data can be cleared using the scan tool (Click here).

  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 duplicating 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. DLC3 (Data Link Connector 3)

    1. Check the DLC3 (Click here).

  6. INSPECT BATTERY VOLTAGE

    Standard Voltage

    11 to 14 V

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

  7. CHECK MIL

    1. Check that the MIL illuminates when the ignition switch is turned to ON.

      If the MIL does not illuminate, there is a problem in the MIL circuit (Click here).

    2. When the engine is started, check that the MIL should turn off.

  8. ALL READINESS

    Tip:

    • With "All Readiness" you can check whether or not the DTC judgment has been completed by using the GTS.

    • You should check "All Readiness" after simulating malfunction symptoms or for validation after finishing repairs.

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs (Click here).

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Perform the DTC judgment driving pattern to run the DTC judgment.

    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    10. Input the DTCs to be confirmed.

    11. Check the DTC judgment result.

GTS Display

Description

NORMAL

  • DTC judgment completed

  • System normal

ABNORMAL

  • DTC judgment completed

  • System abnormal

INCOMPLETE

  • DTC judgment not completed

  • You should perform driving pattern after confirming DTC enabling conditions

N/A

  • Unable to perform DTC judgment

  • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit