SFI SYSTEM DIAGNOSIS SYSTEM


  1. EURO-OBD (EUROPEAN SPEC)

    A005KNL

    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:


    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 recorded in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.

      To check DTCs, connect the intelligent tester or an 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 erased using the scan tool Click here.

  2. M-OBD (except EUROPEAN SPEC)

    A005KNL

    When troubleshooting Multiplex On-Board Diagnostic (M-OBD) vehicles, the vehicle must be connected to the intelligent tester. Various data output from the ECM can then be read.

    OBD regulations require that the vehicle's on-board computer illuminates the 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 DTCs are recorded in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.

  3. 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.

  4. 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 illuminates (2nd trip).

  5. 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 running or stopped, 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.

  6. DLC3 (Data Link Connector 3)


    1. Check the DLC3 Click here.

  7. INSPECT BATTERY VOLTAGE

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

  8. 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, the MIL should turn off.

  9. ALL READINESS

    Tech Tips


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

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Clear the DTCs.

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

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

    7. Input the DTCs to be confirmed.

    8. Check the DTC judgment result.

    10. Intelligent Tester
    Tester 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
    UNKNOWN

    • Unable to perform DTC judgment

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