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SFI SYSTEM (w/o EGR System) DIAGNOSIS SYSTEM

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  1. A003V4GE03

    M-OBD (EXCEPT EUROPEAN SPEC.)


    • When troubleshooting a Multiplex On-Board Diagnostic (M-OBD) vehicle, 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 on-board computer illuminate 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 stored 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.

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

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

  4. DLC3 (Data Link Connector 3)


    1. Check the DLC3 (Click here).

  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. AUXILIARY BATTERY VOLTAGE

    Standard voltage
    11 to 16 V

    • If voltage is below 11 V, replace or recharge the auxiliary battery.

  7. MIL (Malfunction Indicator Lamp)


    1. The MIL illuminates when the power switch is turned on (IG).

    2. The MIL should turn off when the power switch on (READY). If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.

      Tip:

      If the MIL does not illuminate when the power switch is turned to on (IG), check the MIL circuit (Click here).

  8. ALL READINESS

    Tip:

    • 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 simulating malfunction symptoms or for validation after finishing repairs.


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs (Click here).

    5. Turn the power switch off and wait for at least 30 seconds.

    6. Turn the power switch on (IG) and turn the tester on.

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

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

    9. Input the DTCs to be confirmed.

    10. Check the DTC judgment result.

      Tester Display Description
      NORMAL

      • DTC judgment completed

      • System normal
      ABNORMAL

      • DTC judgment completed

      • System abnormal
      INCOMPLETE

      • DTC judgment not completed

      • Perform the driving pattern after confirming the DTC enabling conditions
      N/A

      • Unable to perform DTC judgment

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