SFI SYSTEM (w/ Secondary Air Injection System) DIAGNOSIS SYSTEM


  1. DESCRIPTION FOR M-OBD

    A01J66TE01
    A01J639E01

    When troubleshooting Multiplex OBD (M-OBD) vehicles, the vehicle must be connected to the intelligent tester. 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. If the malfunction does not reoccur, the MIL stays ON until the ignition switch is turned OFF, and then the MIL turns OFF when the ignition switch is turned ON. However, the DTCs remain recorded in the ECM memory.

    To check the DTCs, connect the intelligent tester to the DLC3 (Data Link Connector 3) on the vehicle or connect terminals TC and CG on the DLC3 (DTCs will be displayed in the combination meter).

  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 to increase the system's ability to detect malfunctions, including intermittent problems, when simulating malfunction symptoms (Intelligent tester only).

  3. 2 TRIP DETECTION LOGIC


    • When a malfunction is first detected, a DTC 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. DLC3 (Data Link Connector 3)

    A01J6ILE23

    The vehicle's ECM uses the ISO 14230 (M-OBD) communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 14230 format.

    Symbols (Terminal No.) Terminal Description Condition Specified Condition
    SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
    CG (4) - Body ground Chassis ground Always Below 1 Ω
    SG (5) - Body ground Signal ground Always Below 1 Ω
    BAT (16) - Body ground Battery positive Always 9 to 14 V

    If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

    Tech Tips

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


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


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

  5. BATTERY VOLTAGE


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

  6. MIL (Malfunction Indicator Lamp)


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

    2. The MIL should turn 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 first turned to ON, check the MIL circuit Click here.

  7. ALL READINESS

    Tech Tips


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

    • Check "All Readiness" after simulating 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. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON 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.

    8. Intelligent Tester
    Tester Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • 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