ECD SYSTEM(w/ Urea SCR System) 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 / Primary.

    4. Take a snapshot of the Data List items.

      Tech Tips


      • A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting.

      • 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 105 kPa or higher and MAF is 84 gm/sec or more*2 B
      Except above*3 C

      Tech Tips

      The above values were measured under standard atmospheric pressure. The value 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

    GO TO STEP 19 Click here

    C

    CHECK INTAKE SYSTEM Click here

    A

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


    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 / Atmosphere Pressure and MAP.


      Powertrain > Engine > Data List
      Tester Display
      Atmosphere Pressure
      MAP

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

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

      Tech Tips


      • If MAP and Atmosphere Pressure have the same value, both are normal. If there is a difference of 10 kPa or higher, 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 SENSOR Click here

    C

    REPLACE ECM Click here

    A

  4. CHECK INTAKE SYSTEM


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

      Result
      Result Proceed to
      No leaks or blockages in the intake system A
      Leaks and/or blockages exist in the intake system B

      Tech Tips


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


    B

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    A

  5. INSPECT TURBOCHARGER SUB-ASSEMBLY


    1. Inspect the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    OK

  6. CHECK FOR INTERMITTENT PROBLEMS


    1. Check for intermittent problems.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 19 Click here

  7. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 19 Click here

  8. REPAIR OR REPLACE INTAKE SYSTEM


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

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 19 Click here

  9. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR


    1. Replace the manifold absolute pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 19 Click here

  10. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 19 Click here

  11. CHECK INTAKE SYSTEM


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

      Result
      Result Proceed to
      No leaks or blockages in the intake system A
      Leaks and/or blockages exist in the intake system B

      Tech Tips


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


    B

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    A

  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 / Data List / MAF.


      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.

      Tech Tips


      • 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 to restart the engine.

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

      • When idling the engine, the EGR cooler is bypassed.

      Result
      GTS Display 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.

      Tech Tips

      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 sub-assembly.

      Reference
      EGR Valve Condition (Opening) Measuring Condition MAF (Reference)
      Open (50%)

      • Atmospheric pressure: 101 kPa

      • Engine coolant temperature: 75°C (167°F)

      		 3 to 10 gm/sec
      Closed (0%) 12 to 18 gm/sec

    B

    READ VALUE USING GTS (ENGINE SPEED AND 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 / Diesel Exhaust / MAF and EGR Cooler Bypass Position.

      Tech Tips

      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.


      Powertrain > Engine > Active Test
      Active Test Display
      Activate the VSV for EGR Cooler Bypass
      Data List Display
      MAF
      EGR Cooler Bypass Position

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

      Tech Tips


      • 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.

      • When operating "Activate the VSV for EGR Cooler Bypass", check that "Cooler" and "Bypass" can be switched between and the EGR cooler by-pass valve regulating link operates. If the link does not operate, the inspection cannot be performed correctly. Therefore, inspect and repair the following parts, perform the Active Test and read the changes in the MAF value.

        - No. 2 EGR valve assembly

        Click here

        - Vacuum hose connection

        Click here

        - Vacuum switching valve assembly (for EGR Bypass Valve)

        Click here

      Result
      GTS Display Result Proceed to

      Activate the VSV for EGR Cooler Bypass:

      Cooler to Bypass

      		 MAF value does not change A
      MAF value changes B

      Tech Tips

      If the EGR cooler is clogged, the MAF value changes.


    A

    GO TO STEP 19 Click here

    B

    GO TO STEP 17 Click here

  14. READ VALUE USING GTS (ENGINE SPEED AND 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 / Engine Speed and MAF.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed
      MAF

    4. Start the engine and read the value when 30 seconds has elapsed.

      Standard
      Engine speed MAF
      Idling

      • 2 to 17 gm/sec (EGR on)

      • 13 to 20 gm/sec (EGR off)
      3000 rpm (without load)

      • 36 to 67 gm/sec (EGR on)

      • 63 to 72 gm/sec (EGR off)
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click 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 / Primary / 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 / Diesel Exhaust / MAF and 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

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

      Tech Tips


      • 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.

      • When operating "Activate the VSV for EGR Cooler Bypass", check that "Cooler" and "Bypass" can be switched between and the EGR cooler by-pass valve regulating link operates. If the link does not operate, the inspection cannot be performed correctly. Therefore, inspect and repair the following parts, perform the Active Test and read the changes in the MAF value.

        - No. 2 EGR valve assembly

        Click here

        - Vacuum hose connection

        Click here

        - Vacuum switching valve assembly (for EGR Bypass Valve)

        Click here

      Result
      GTS Display Result Proceed to

      Activate the VSV for EGR Cooler Bypass:

      Cooler to Bypass

      		 MAF value does not change A
      MAF value changes B

      Tech Tips

      If the EGR cooler is clogged, the MAF value changes.


    B

    GO TO STEP 17 Click 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, make sure the valve is completely closed.

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

      • When cleaning the electric EGR control valve, 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.

      • When cleaning the electric EGR control valve, care should be taken to prevent the ingress of cleaning solvent into the bearings of the valve shaft, and when wiping off deposits on the EGR valve, care should be taken not to push the deposits into the bearings of the valve shaft. These contaminants may adversely affect the function of the EGR valve.

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

        Click here

      Tech Tips


      • 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, the amount of recirculated exhaust gas becomes excessive and combustion becomes unstable. Also, there may be a lack of power.

      Result
      Proceed to
      NEXT

    NEXT

  17. REPLACE NO. 1 EGR COOLER


    1. Replace the No. 1 EGR cooler.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 19 Click here

  18. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly.

      Click here

      Tech Tips

      If foreign matter is stuck inside the mass air flow meter sub-assembly, the output characteristics of the mass air flow meter sub-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

    GO TO STEP 19 Click here