ECD SYSTEM Intake/Exhaust System

DTC Code DTC Name
Intake/Exhaust System

CAUTION / NOTICE / HINT

Note:

After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

PROCEDURE

  1. TAKE SNAPSHOT DURING IDLING AND 4000 RPM (PROCEDURE 1)

    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Data List / All Data.

    4. Take a snapshot of the following Data List items.

      Tip:

      • A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting. The data in the list below is that of a normal vehicle, but as the data varies between individual vehicles, this data should only be used for reference.

      • Check the Data List at idling and at 4000 rpm with no load after the engine is warmed up.

    Result

    Proceed to

    NEXT
    NEXT

  2. READ VALUE USING GTS (MAP AND MAF)

    1. Check MAP and MAF in the snapshot taken in procedure 1 when the engine was running at 4000 rpm with no load.

      Result

      Result

      Proceed to

      MAP is below 90 kPa*1

      A

      MAP is 120 kPa or more and MAF is 85 gm/s or more*2

      B

      Except above*3

      C
      Tip:

      The above values were measured under standard atmospheric pressure. The values are influenced by elevation, weather conditions, etc.

      Standard atmospheric pressure is 101 kPa (1.0 kgf/cm2, 15 psi). For every 100 m (328 ft.) increase in elevation, pressure drops by 1 kPa (0.01 kgf/cm2, 0.1 psi). This varies by weather.

      *1: There may be a problem in the turbocharger system.

      *2: There may be a problem in the fuel system or intake system.

      *3: There may be a problem in intake system or a problem with the EGR valve (valve stuck open or valve does not close).

    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

    C

    CHECK INTAKE SYSTEMClick here

    A

  3. READ VALUE USING GTS (MAP AND ATMOSPHERE PRESSURE)

    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Data List / MAP and Atmosphere Pressure.

      Powertrain > Engine > Data List

      Tester Display

      Atmosphere Pressure

      MAP

    4. Compare MAP and Atmosphere Pressure when the ignition switch ON (do not start the engine).

      Standard

      Difference between MAP and Atmosphere Pressure is less than 8 kPa.

      Tip:

      • If MAP and Atmosphere Pressure have the same value, both are normal. If there is a difference of 10 kPa or more, compare the values to the atmospheric pressure for that day. The sensor whose deviation is the greatest is malfunctioning.

      • Standard atmospheric pressure is 101 kPa (1.0 kgf/cm2, 15 psi). For every 100 m (328 ft.) increase in elevation, pressure drops by 1 kPa (0.01 kgf/cm2, 0.1 psi). This varies by weather.

      Result

      Result

      Proceed to

      MAP and Atmosphere Pressure have same value

      A

      MAP is different from actual atmospheric pressure

      B

      Atmosphere Pressure is different from actual atmospheric pressure

      C
    B

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSORClick here

    C

    REPLACE ECMClick here

    A

  4. CHECK INTAKE SYSTEM

    1. Check for air leaks and blockages between the air cleaner case and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.

      Result

      Proceed to

      No leaks or blockages in the intake system

      Leaks and/or blockages exist in the intake system
      Tip:

      • Inspect the intake system, especially hoses and pipes between the air cleaner and turbocharger sub-assembly.

      • Check for abnormal disconnections, pipe and hose squashing, and any damage in the intake system.

      • Using your hand, check whether the pipes and hoses in the intake system are securely connected.

      • By applying soapy water and revving up the engine, air leaks from the intake system can be checked by checking for bubbles.

      • Make sure that the hose between the manifold absolute pressure sensor and intake manifold is not loose or disconnected.

      • Check for any modifications in the intake system made by the user.

    Leaks and/or blockages exist in the intake system

    REPAIR OR REPLACE INTAKE SYSTEMClick here

    No leaks or blockages in the intake system

  5. INSPECT TURBOCHARGER SUB-ASSEMBLY

    1. Inspect the turbocharger sub-assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE TURBOCHARGER SUB-ASSEMBLYClick here

    OK

  6. CHECK FOR INTERMITTENT PROBLEMS

    1. Check for intermittent problems.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  7. REPLACE TURBOCHARGER SUB-ASSEMBLY

    1. Replace the turbocharger sub-assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  8. REPAIR OR REPLACE INTAKE SYSTEM

    1. Repair or replace the malfunctioning part in the intake system.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  9. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

    1. Replace the manifold absolute pressure sensor.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  10. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  11. CHECK INTAKE SYSTEM

    1. Check for air leaks and blockages between the air cleaner case and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.

      Result

      Proceed to

      No leaks or blockages in the intake system

      Leaks and/or blockages exist in the intake system
      Tip:

      • Inspect the intake system, especially hoses and pipes between the air cleaner and turbocharger sub-assembly.

      • Check for abnormal disconnections, pipe and hose squashing, and any damage in the intake system.

      • Using your hand, check whether the pipes and hoses in the intake system are securely connected.

      • By applying soapy water and revving up the engine, air leaks from the intake system can be checked by checking for bubbles.

      • Make sure that the hose between the manifold absolute pressure sensor and intake manifold is not loose or disconnected.

      • Check for any modifications in the intake system made by the user.

    Leaks and/or blockages exist in the intake system

    REPAIR OR REPLACE INTAKE SYSTEMClick here

    No leaks or blockages in the intake system

  12. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE EGR VALVE CLOSE)

    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up, and make sure the A/C switch and all accessory switches are off.

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

    4. Start the engine and turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Data List / MAF.

      Powertrain > Engine > Data List

      Tester Display

      MAF

    6. Read the MAF value displayed on the GTS while the engine is idling.

    7. Enter the following menus: Powertrain / Engine / Active Test / Activate the EGR Valve Close.

      Powertrain > Engine > Active Test

      Active Test Display

      Activate the EGR Valve Close

      Data List Display

      MAF

    8. Read the MAF value when the EGR valve is closed using the Active Test function.

      Tip:

      • If idling continues for 20 minutes or more, the EGR valve target opening angle becomes 0% (EGR valve fully closed). As this makes diagnosis impossible, it becomes necessary to drive the vehicle or restart the engine.

      • Before performing the diagnosis, confirm that the EGR valve target opening angle is not 0%.

      Result

      Active Test

      Result

      Proceed to

      Activate the EGR Valve Close:

      OFF (Open) to Close

      MAF value changes

      A

      MAF value does not change

      B
      Note:

      As the measured values may differ from those shown below due to factors such as differences in measuring environments and changes in vehicle condition due to aging, do not use these values to determine whether the vehicle is malfunctioning or not.

      Tip:

      The problem may be a temporary one, due to the entry of deposits or foreign matter. Check that there are no deposits or foreign matter in the electric EGR control valve assembly or mass air flow meter assembly.

      Reference

      EGR Valve Condition (Opening)

      Measuring Condition

      MAF (Reference)

      Open (67%)

      • Atmosphere pressure: 101 kPa

      • Intake air temperature: 30°C (86°F)

      • Engine coolant temperature: 88°C (190°F)

      3 to 12 gm/s

      Closed (0%)

      7 gm/s or more
    B

    READ VALUE USING GTS (MAF)Click here

    A

  13. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EGR COOLER BYPASS)

    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up, and make sure the A/C switch and all accessory switches are off.

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

    4. Start the engine and turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Data List / MAF.

      Powertrain > Engine > Data List

      Tester Display

      MAF

    6. Read the MAF value displayed on the GTS while the engine is idling.

    7. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EGR Cooler Bypass / Data List / EGR Cooler Bypass Position.

      Powertrain > Engine > Active Test

      Active Test Display

      Activate the VSV for EGR Cooler Bypass

      Data List Display

      MAF

      EGR Cooler Bypass Position
      Tip:

      Whether the EGR is passing through the bypass side or cooler side during the Active Test can be confirmed by checking EGR Cooler Bypass Position.

    8. Using the Active Test function, switch the EGR valve bypass switching valve between "Cooler" and "Bypass" a few times, and then check whether the MAF value changes after switching the valve from "Cooler" to "Bypass".

      Tip:

      If idling continues for 20 minutes or more, the EGR valve target opening angle becomes 0% (EGR valve fully closed). As this makes diagnosis impossible, it becomes necessary to drive the vehicle or restart the engine.

      Result

      Active Test

      Result

      Proceed to

      Activate the VSV for EGR Cooler Bypass:

      Cooler to Bypass

      MAF value does not change

      A

      MAF value changes

      B
      Tip:

      If the EGR cooler is clogged, the mass air flow changes.

    A

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

    B

    REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLYClick here

  14. READ VALUE USING GTS (MAF)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Data List / MAF.

      Powertrain > Engine > Data List

      Tester Display

      MAF

    4. With the ignition switch ON and engine stopped, read the value when 30 seconds has elapsed.

      Standard

      GTS Display

      Condition

      Standard

      MAF

      Ignition switch ON (do not start engine)

      Less than 0.35 gm/s

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE MASS AIR FLOW METER ASSEMBLYClick here

    OK

  15. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EGR COOLER BYPASS)

    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up, and make sure the A/C switch and all accessory switches are off.

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

    4. Start the engine and turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Data List / MAF.

      Powertrain > Engine > Data List

      Tester Display

      MAF

    6. Read the MAF value displayed on the GTS while the engine is idling.

    7. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EGR Cooler Bypass / Data List / EGR Cooler Bypass Position.

      Powertrain > Engine > Active Test

      Active Test Display

      Activate the VSV for EGR Cooler Bypass

      Data List Display

      MAF

      EGR Cooler Bypass Position
      Tip:

      Whether the EGR is passing through the bypass side or cooler side during the Active Test can be confirmed by checking EGR Cooler Bypass Position.

    8. Using the Active Test function, switch the EGR valve bypass switching valve between "Cooler" and "Bypass" a few times, and then check whether the MAF value changes after switching the valve from "Cooler" to "Bypass".

      Tip:

      If idling continues for 20 minutes or more, the EGR valve target opening angle becomes 0% (EGR valve fully closed). As this makes diagnosis impossible, it becomes necessary to drive the vehicle or restart the engine.

      Result

      Active Test

      Result

      Proceed to

      Activate the VSV for EGR Cooler Bypass:

      Cooler to Bypass

      MAF value does not change

      A

      MAF value changes

      B
      Tip:

      If the EGR cooler is clogged, the mass air flow changes.

    B

    REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLYClick here

    A

  16. CHECK FOR DEPOSIT (ELECTRIC EGR CONTROL VALVE ASSEMBLY)

    1. Remove the electric EGR control valve assembly.

      Click here

    2. Visually check the electric EGR control valve assembly for deposits.

      If there are deposits, clean the electric EGR control valve assembly.

      Note:

      • When cleaning the electric EGR control valve assembly, make sure the valve is completely closed.

      • When cleaning the electric EGR control valve assembly, perform initialization procedure.

        Click here

      • Do not forcibly open the valve, as it may be damaged or deformed.

      • When cleaning the electric EGR control valve assembly, use a piece of cloth soaked with cleaning solvent. Spraying the solvent directly onto these parts or soaking the parts in the solvent may damage the parts.

      Tip:

      • If the EGR valve does not open properly or is stuck closed, the amount of intake air increases and combustion sounds and engine vibration may increase.

      • If the EGR valve does not close properly or is stuck open, EGR becomes excessive and combustion becomes unstable. Also, there may be a lack of power.

    Result

    Proceed to

    NEXT
    NEXT

  17. REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLY

    1. Replace the EGR cooler.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  18. REPLACE MASS AIR FLOW METER ASSEMBLY

    1. Replace the mass air flow meter assembly.

      Click here

      Tip:

      If foreign matter is stuck inside the mass air flow meter assembly, the output characteristics of the mass air flow meter assembly may change, resulting in a malfunction.

    Result

    Proceed to

    NEXT
    NEXT

  19. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    Result

    Proceed to

    NEXT
    NEXT

    END

  20. REPAIR OR REPLACE INTAKE SYSTEM

    1. Repair or replace the malfunctioning part in the intake system.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here