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

INSPECTION PROCEDURE

Tech Tips


  • If the exhaust gas 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

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

    OK

  2. CHECK INTAKE SYSTEM


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

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


    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  3. PERFORM ENGINE SPEED 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 injection or supply pump assembly.

      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 assembly.

    5. Accelerate the engine speed to the maximum speed 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 Click here

    OK

  4. INSPECT FUEL SYSTEM


    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. Start the engine and turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Test the Fuel Leak.

    5. Perform the active test.

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

    7. 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 sub-assembly.


    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. 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.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to ON.

    6. Turn the tester on.

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

    8. Check the differential pressure when the exhaust gas temperature sensor indicates 200°C (392°F) 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 center exhaust pipe assembly (catalyst converter) may have deteriorated or the center exhaust pipe assembly (catalyst converter) 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 Temperature B1S1 is 200°C (392°F) or less) 15 kPa or less (MIL is not illuminated) A
      3500 to 3600 rpm (Exhaust Temperature B1S1 is 200°C (392°F) or less) 15 kPa or more (MIL is not illuminated) B
      3500 to 3600 rpm (Exhaust Temperature B1S1 is 200°C (392°F) or less) MIL remains ON C

    B

    REPLACE CENTER EXHAUST PIPE ASSEMBLY Click here

    C

    GO TO DPF FORCIBLE REGENERATION PROCEDURE

    A

    END