ECD SYSTEM(w/ DPF), Diagnostic DTC:P2084

DTC Code DTC Name
P2084 Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0545 Click here.

P2084
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
5 minutes elapsed after engine start

The actual exhaust gas temperature sensor B1S2 output differs from the estimate exhaust gas temperature sensor more than threshold for 8 seconds or more.

(1 trip detection logic)

  • Open or short in exhaust gas temperature sensor B1S2 circuit

  • Exhaust gas temperature sensor B1S2

  • Leak or blockage in intake or exhaust system

  • Blockage in EGR passage

  • Electric EGR control valve assembly

  • Diesel turbo pressure sensor

  • Turbocharger sub-assembly

  • Mass air flow meter

  • Injector assembly

  • ECM
Related Data List
DTC No. Data List
P2084

  • Exhaust Temperature B1S1

  • Exhaust Temperature B1S2

Tech Tips


  • Sensor 1 represents a sensor located before the CCo catalytic converter.

  • Sensor 2 represents a sensor located before the DPF catalytic converter.

  • If DTC P2084 is stored, the following symptoms may appear:


    • White smoke

MONITOR DESCRIPTION

When the vehicle is being driven, the ECM monitors the exhaust gas temperature comparing between the estimate and the actual temperature based on the values of the exhaust gas temperature sensor B1S2. If the difference between the estimate and the actual temperature is more than the threshold, the ECM interprets this as a malfunction in the exhaust gas temperature sensor and stores DTCs.

WIRING DIAGRAM

Refer to DTC P2032 Click here.

CAUTION / NOTICE / HINT

Note

When replacing the ECM and/or injector assembly, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2084)


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read DTCs.

      Result
      Result Proceed to
      Except below A
      DTC P2084 and P2032 or P2033 B

      Tech Tips

      If DTCs related to open/short circuit of exhaust gas temperature sensor other than P2084 are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR - ECM)


    1. Disconnect the exhaust gas temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B41-1 (THCO) - A59-48 (THCO) Always Below 1 Ω
      B41-2 (E2) - A59-49 (ETCO) Always Below 1 Ω
      B41-1 (THCO) or A59-48 (THCO) - Body ground Always 10 kΩ or higher
      B41-2 (E2) or A59-49 (ETCO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (EXHAUST TEMPERATURE B1S1 AND B1S2)


    1. Stop the engine and wait for 30 seconds or more.

    2. Start the engine.

    3. Allow the engine to idle for 5 minutes.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1 and Exhaust Temperature B1S2.

    7. Read the values.

      Note

      Confirm that PM regeneration is not operating.

      Tech Tips

      When reading the values of Data List, confirm that PM regeneration is not activating (value of "After Injection Period" is 0) by entering the following menus: Powertrain / Engine and ECT / Data List / After Injection Period.

      If PM regeneration is activating (value of "After Injection Period" is not 0), drive the vehicle until the PM regeneration is complete (value of "After Injection Period" becomes 0).

      Standard
      Exhaust Temperature B1S1 and Exhaust Temperature B1S2 display between 80 to 300°C (176 to 572°F).
      Difference between Exhaust Temperature B1S1 and Exhaust Temperature B1S2 should be within +/-100°C (212°F).

      Tech Tips

      For reference, the results of a "real-vehicle check" are as shown in the table below:

      Note

      In the table below, the values listed are reference. Do not depend solely on these reference values when deciding whether a part is faulty or not.

      Exhaust Temperature B1S1 and B1S2 (Result of Real-Vehicle Check)
      Condition Exhaust Temperature B1S1 Exhaust Temperature B1S2
      Idling with warmed engine 103.1°C (217°F) 101.2°C (214°F)
      2500 rpm without load 140.6°C (285°F) 136.2°C (277°F)
      4000 rpm without load 165.6°C (330°F) 160.0°C (320°F)

    NG

    REPLACE EXHAUST GAS TEMPERATURE SENSOR NO.2 Click here

    OK

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)


    1. Remove the electric EGR control valve assembly Click here.

    2. Connect the electric EGR control valve assembly connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

    6. When changing the Active Test value from 0 to 100%, check that Actual EGR Valve Pos. smoothly changes to the set opening angle.

      OK
      Value smoothly changes to the set opening angle.

    7. Check that the EGR valve is fully closed.

      OK
      The EGR valve fully closes.
      A01VGZDE06
      Text in Illustration
      *1 Electric EGR Control Valve Assembly - -
      *a Part A *b Clearance
      *c OK *d NG

      Note

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

      Tech Tips


      • Hold the electric EGR control valve assembly to a light and confirm that the valve contacts with the valve seat securely.

      • If light leaks out from the valve, the electric EGR control valve assembly is not fully closed.

      • If the electric EGR control valve assembly cannot close fully, hesitation or poor acceleration almost certainly has occurred while driving the vehicle.

      • Even if the electric EGR control valve assembly is closed completely, light leaks from the closed gap of valve seat (Part A) as shown in the illustration, but this is normal.


    OK

    REMOVE DEPOSIT (CLEAN EGR PASSAGE) Click here

    NG

  5. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly Click here.

      Tech Tips

      Install the new electric EGR control valve assembly after the cleaning the EGR passage (next step).

    2. Turn the ignition switch to ON.

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


    NEXT

  6. REMOVE DEPOSIT (CLEAN EGR PASSAGE)


    1. Remove the diesel throttle body assembly, intake air connector and EGR pipe connector.

    2. Remove the deposits from those parts and clean them.

      Note


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

      • Extreme care must be taken to prevent the removed deposits from falling into the engine unit during cleaning.

      Tech Tips


      • Remove the intake manifold from the cylinder head when it has to be cleaned.

      • Do not leave any deposits in the electric EGR control valve assembly when cleaning the valve.


    NEXT

  7. READ VALUE USING INTELLIGENT TESTER (INJECTION FEEDBACK VAL #1 TO #4 AND INJECTION VOLUME)


    1. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more.

    2. Allow the engine to idle for 30 seconds or more.

      Tech Tips

      The shift lever should be in neutral and the A/C switch and all accessory switches should be off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Injection Feedback Val. #1 to #4 and Injection Volume.

    6. Read the values.

      Tech Tips

      When reading the values of Data List, confirm that PM regeneration is not activating (value of "After Injection Period" is 0) by entering the following menus: Powertrain / Engine and ECT / Data List / After Injection Period.

      If PM regeneration is activating (value of "After Injection Period" is not 0), drive the vehicle until the PM regeneration is complete (value of "After Injection Period" becomes 0).

      Standard
      Tester Display Engine Condition Specified Condition
      Injection Volume Idling

      Less than 8 mm3/st

      Injection Feedback Val. #1

      Injection Feedback Val. #2

      Injection Feedback Val. #3

      Injection Feedback Val. #4

      		 Idling

      Between -2.0 mm3/st and 2.0 mm3/st

      Tech Tips


      • Cylinders that have a compensation value which is more than the value specified above are considered to be faulty. Use the following steps to inspect and repair the cylinder.

      • If the value of Injection Volume is 8 mm3/st or more and the value of all of the Injector Feedback Val. #1 to #4 is within the threshold, replace the injector assemblies for all cylinders.

        In this case, there is a possibility that too much recirculated exhaust gas enters into the engine. Therefore, you should compare the Target EGR Position with the Actual EGR Valve Pos. by entering the following menus using the intelligent tester: Powertrain / Engine and ECT / Data List / Target EGR Position and Actual EGR Valve Pos.

        If the difference between Target EGR Position and Actual EGR Valve Pos. exceeds +/-10%, the EGR system may have a malfunction.


    OK

    CHECK WHETHER DTC OUTPUT RECURS (DTC P2084) Click here

    NG

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (INJECTION CUT FOR IDENTIFYING MALFUNCTIONING CYLINDER) Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P2084) Click here

  9. REPLACE EXHAUST GAS TEMPERATURE SENSOR NO.2


    1. Replace the exhaust gas temperature sensor B1S2 Click here.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P2084) Click here

  10. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (INJECTION CUT FOR IDENTIFYING MALFUNCTIONING CYLINDER)


    1. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Cylinder#1 to #4 Fuel Cut.

    5. Check the four cylinders in sequence to identify a faulty cylinder.

      Tech Tips


      • DTCs may be output after this Active Test. Make sure to check for DTCs after this Active Test. If any DTCs are output, make sure to clear them Click here.

      • If the engine idling condition does not change despite cutting off the fuel injection, the cylinder is malfunctioning.


    NEXT

  11. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (INJECTION CUT FOR IDENTIFYING MALFUNCTIONING PART)


    1. Change the injector assembly of the malfunctioning cylinder to an injector assembly of the cylinder that functions normally.

    2. Start the engine and drive the vehicle until the engine coolant temperature reaches 75°C (167°F) or more.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Cylinder#1 to #4 Fuel Cut.

    6. Check the four cylinders in sequence to identify a faulty cylinder.

      Tech Tips


      • DTCs may be output after this Active Test. Make sure to check for DTCs after this Active Test. If any DTCs are output, make sure to clear them Click here.

      • If the engine idling condition does not change despite cutting off the fuel injection, the cylinder is malfunctioning.

    7. Confirm the malfunctioning cylinder.

      Result
      Result Proceed to
      Different cylinder malfunction identified A
      Same cylinder malfunction identified B

    B

    CHECK ENGINE ASSEMBLY Click here

    A

  12. REPLACE INJECTOR ASSEMBLY


    1. Replace the injector assembly of the malfunctioning cylinder Click here.


    NEXT

  13. PERFORM REGISTRATION AND INITIALIZATION


    1. Perform registration and initialization Click here.


    NEXT

  14. BLEED AIR FROM FUEL SYSTEM


    1. Bleed air from fuel system Click here.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P2084) Click here

  15. CHECK ENGINE ASSEMBLY


    1. Check the engine assembly to determine the cause of low compression and other factors that would cause the exhaust gas temperature to rise insufficiently.

      Tech Tips

      The speed of each cylinder can be measured (compression test) by using the intelligent tester.

      In the compression test, perform Active Test using intelligent tester (Check the Cylinder Compression) and crank the engine for approximately 10 seconds. At this time, the speed of each cylinder is measured. If the speed of one cylinder is higher than the other cylinders, the compression pressure of that cylinder is determined to be lower than the other cylinders.


      1. Warm up the engine.

      2. Turn the ignition switch off.

      3. Connect the intelligent tester to the DLC3.

      4. Turn the ignition switch to ON and turn the tester on.

      5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Check the Cylinder Compression / Engine Speed of Cyl #1, Engine Speed of Cyl #2, Engine Speed of Cyl #3, Engine Speed of Cyl #4 and Av Engine Speed of All Cyl.

      6. Push the snapshot button to turn the snapshot function on.

        Tech Tips

        Using the snapshot function, data can be recorded during the Active Test.

      7. While the engine is not running, press the RIGHT or LEFT button to Change the Cylinder Compression to ON.

        Tech Tips

        After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.

      8. Crank the engine for about 10 seconds.

      9. Monitor the engine speed (Engine Speed of Cyl #1 to #4, Av Engine Speed of All Cyl) displayed on the tester.

        Tech Tips

        After approximately 10 seconds of engine cranking, the engine speed measurement of each cylinder will change to the actual engine speed.

        Note


        • Do not crank the engine continuously for 20 seconds or more.

        • If Check the Cylinder Compression needs to be performed after it is turned ON and performed once, press Exit to return to the Active Test menu screen. Then perform Check the Cylinder Compression again.

        • Use a fully-charged battery.

      10. Stop cranking the engine, and then change "Check the Cylinder Compression" to OFF after the engine stops.

        Note

        If the Active Test is changed to OFF while the engine is being cranked, the engine will start.

      11. Push the snapshot button to turn the snapshot function off.

      12. Select the recorded data and display the data as a graph.

      13. Check the change in engine speed values.


    NEXT

  16. CHECK WHETHER DTC OUTPUT RECURS (DTC P2084)


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Start the engine.

    5. Allow the engine to idle for 7 minutes or more.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Read the DTCs.

      Result
      Result Proceed to
      DTC P2084 A
      No DTC output B

    B

    END

    A

  17. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  18. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Start the engine.

    5. Allow the engine to idle for 7 minutes or more.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Confirm that the DTC is not output again.


    NEXT

    END