ECD SYSTEM Abnormal Temperature Detection by Exhaust Temperature Sensor (Downstream)

INSPECTION PROCEDURE

Tech Tips


  • If the exhaust temperature sensor detects an abnormally high temperature, conduct the following inspection.

  • Check the amount of engine oil after troubleshooting is finished.

  • If the amount of engine oil is more than the specified level, replace the engine oil.

PROCEDURE


  1. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Inspect the air cleaner filter element sub-assembly Click here.


    NG

    GO TO DTC CHART

    OK

  2. CHECK INTAKE SYSTEM


    1. Check for air leaks and blockage between the air cleaner and turbocharger.

    2. Check for air leaks and blockage between the turbocharger and intake manifold.


    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  3. PERFORM ENGINE RPM ACCELERATION

    Tech Tips

    If the exhaust gas contains excessive black smoke, perform the following operations:


    1. Warm up the engine.

    2. Disconnect the negative battery terminal and wait for at least 1 minute.

    3. Initialize the learning values of the supply pump.

      Tech Tips

      Perform initialization with the engine warmed up (engine coolant temperature is 60°C (140°F) or more and fuel temperature is 20°C (68°F) or more).

    4. Initialize the learning values of the diesel throttle body.

    5. Accelerate the engine speed to the maximum rpm with no load 20 times.

    6. Check for black smoke in the exhaust gas.

      Result
      Result Proceed to
      Black smoke is not present OK
      Black smoke remains in the exhaust gas NG

      Tech Tips

      Soot deposits in the exhaust system may cause excessive black smoke.


    NG

    GO TO BLACK SMOKE EMITTED

    OK

  4. INSPECT FUEL SYSTEM


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Select the following menu items: Powertrain / Engine and ECT / Active Test / Test the Fuel Leak.

    4. Perform the active test.

    5. Visually check the supply pump, injector and fuel line located between the supply pump and common rail for fuel leaks and fuel pressure leaks. Also, perform the same check on the fuel line between the common rail and the injector.

    6. Check that the fuel filter is not clogged.


    NEXT

  5. INSPECT FOR ENGINE OIL LEAK


    1. Check that the intake system pipes and hoses are not excessively contaminated with oil.

      Tech Tips


      • If the pipes or hoses are contaminated with oil, clean them.

      • If the pipes or hoses are contaminated with a large amount of oil, repair or replace the parts and areas where engine oil is leaking from.

    2. Check if engine oil is leaking from the turbocharger.


    NEXT

  6. READ VALUE USING INTELLIGENT TESTER (DIFFERENTIAL PRESSURE)


    1. Perform the forcible regeneration function Click here.

    2. After the forcible regeneration is completed, allow the engine to idle for at least 5 minutes.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Data List / DPF Differential Pressure.

    7. Check the differential pressure when the exhaust gas temperature sensor indicates 200°C or less.

      Tech Tips


      • If the exhaust gas temperature is high, the differential pressure cannot be measured correctly.

      • If the differential pressure is outside the normal range, the monolithic converter assembly may have deteriorated or the monolithic converter assembly may be clogged with PM.

      • Fully depress the accelerator pedal and when the engine speed becomes stable, promptly read the differential pressure.

      Result
      Engine Speed (no engine load) Differential Pressure Proceed to
      3500 to 3600 rpm (Exhaust gas temperature (upstream) is 200°C (392°F) or less) 15 kPa or less (MIL is not illuminated) A
      3500 to 3600 rpm (Exhaust gas temperature (upstream) is 200°C (392°F) or less) 15 kPa or more (MIL is not illuminated) C
      Result
      Engine Speed (no engine load) Result Proceed to
      3500 to 3600 rpm (Exhaust gas temperature (upstream) is 200°C (392°F) or less) MIL remains ON B

    B

    GO TO DPF FORCIBLE REGENERATION PROCEDURE

    C

    REPLACE CENTER EXHAUST PIPE ASSEMBLY

    A

    END