ECD SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION

    A01CIHE

    When troubleshooting Euro-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 and blinked 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 recur, after the ignition switch is turned off and then the engine is started again, the MIL turns off. Be aware that the DTCs remain recorded in the ECM memory.

    To check the DTCs, connect the intelligent tester to the DLC3 on the vehicle.

    Note

    Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

  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 simulating 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, as well as other data recorded at the time of a malfunction.

  5. CHECK DLC3 (Data Link Connector 3)

    A01CISHE16

    The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 15765-4 format.

    Tech Tips

    Connect the cable of the intelligent tester to the DLC3, turn the ignition switch to ON and attempt to use the 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 of 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.

    Terminal No. (Symbols) Terminal Description Condition Result
    7 (SIL) - 5 (SG) Bus "+" line During transmission Pulse generation
    4 (CG) - Body ground Chassis ground Always Below 1 Ω
    5 (SG) - Body ground Signal ground Always Below 1 Ω
    16 (BAT) - Body ground Battery positive Always 18 to 27 V
    6 (CANH) - 14 (CANL) CAN bus line Ignition switch off* 54 to 69 Ω
    6 (CANH) - 4 (CG) HIGH-level CAN bus line Ignition switch off* 200 Ω or higher
    14 (CANL) - 4 (CG) LOW-level CAN bus line Ignition switch off* 200 Ω or higher
    6 (CANH) - 16 (BAT) HIGH-level CAN bus line Ignition switch off* 6 kΩ or higher
    14 (CANL) - 16 (BAT) LOW-level CAN bus line Ignition switch off* 6 kΩ or higher

    Note


    • *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

    • Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    Tech Tips

    Connect the cable of an intelligent tester to the DLC3, turn the ignition switch to ON and attempt to use the 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 of 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.

  6. INSPECT BATTERY VOLTAGE

    If the voltage is below 18 V, recharge or replace the battery.

  7. CHECK MIL


    1. A01CIHE

      The MIL will be illuminated when the ignition switch is turned to ON and the engine is not running.

      Tech Tips

      If the MIL is not illuminated, check the MIL circuit Click here.

    2. When the engine is started, the MIL should turn off. If the MIL remains on or flashes, the diagnosis system has detected a malfunction or abnormality in the ECD system.

  8. 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 simulating malfunction symptoms or for validation after finishing repairs.


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Clear the DTCs Click here.

    6. Turn the ignition switch off and wait for 30 seconds.

    7. Turn the ignition switch to ON and turn the tester 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.

    9. Result
    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's memory limit