ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P204B

DTC Code DTC Name
P204B Reductant Pressure Sensor Circuit Range/Performance

DESCRIPTION

Refer to DTC P208B.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P204B Reductant Pressure Sensor Circuit Range/Performance When the urea pump is not rotating (urea pump operation check complete and not being filled), the pressure sensor value is outside of a fixed range (1 trip detection logic). Pressure sensor (urea pump) Comes on DTC stored
Related Data List
DTC No. Data List
P204B Reductant Pressure

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P204B Ignition switch to ON for 5 seconds or more

CAUTION / NOTICE / HINT

Note


    Handling the urea injector set

  • The urea injector set is a precision instrument. Take necessary precautions for installation and shipping. Do not use the part if it has been struck or dropped.

  • If the urea solution remaining inside the urea injector set dries out, it may become unable to inject urea solution. Therefore, conduct urea tube with heater assembly installation and removal quickly.

  • If the urea solution dries out and deposition occurs, urea may cling to the O-ring of the pipe and cause seal problems. Therefore, clean the urea tube with heater assembly and intake port of the urea injector set with water before attaching them.

  • Perform this procedure in an environment where urea solution will not freeze.

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P204B)


    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 / Trouble Codes.

    4. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P204B is output A
      DTC P204B and other DTCs are output* B

      Tech Tips

      *: If any other DTCs (CAN communication malfunctions or open/short circuits) are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK AROUND BOTTOM VEHICLE


    1. Check around the bottom of the vehicle.

      Tech Tips

      If the urea solution dries on an object, deposition occurs and leaves behind a white powder.

      Area to check:


      • Areas connecting the urea pump and urea injector set.

      • Perforations in the urea tank sub-assembly.

      • Connectors not connected properly.

      • Clogging of the cooling fins of the urea injector set.

        Tech Tips

        If the cooling fins are clogged with foreign matter, remove the foreign matter and clean the cooling fins.

    2. Repair any trouble areas.

      Result
      Proceed to
      NEXT

    NEXT

  3. PERFORM ACTIVE TEST USING GTS (PRESSURE SENSOR CHECK)


    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 / Active Test / Reductant Pump Check (Backward).

    4. Perform the Active Test.


      Powertrain > Engine > Active Test
      Tester Display
      Reductant Pump Check (Backward)

    5. Enter the following menus: Powertrain / Engine / Active Test / Reductant Purge / Data List / Diesel Exhaust / Reductant Pressure.

    6. After executing the Active Test, check the Reductant Pressure.


      Powertrain > Engine > Active Test
      Active Test Display
      Reductant Purge
      Data List Display
      Reductant Pressure
      Standard
      Approximately 0 kPa

    7. Enter the following menus: Powertrain / Engine / Active Test / Reductant Filling (Pressure Keep) / Data List / Diesel Exhaust / Reductant Pressure.

    8. After executing the Active Test, check the Reductant Pressure.

      Tech Tips

      Perform the Active Test until the pressure stabilizes (may take from 5 to 60 seconds).


      Powertrain > Engine > Active Test
      Active Test Display
      Reductant Filling (Pressure Keep)
      Data List Display
      Reductant Pressure
      OK
      400 to 600 kPa
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 5 Click here

    NG

  4. REPLACE UREA PUMP


    1. Replace the urea pump.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    4. Turn the ignition switch off for 30 seconds or more.

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

    6. Wait for 5 seconds or more.

    7. Enter the following menus: Powertrain / Engine / Trouble Codes.

    8. Confirm that the DTC is not output again.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END