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ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P20BB, P20BC

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DTC Code DTC Name
P20BB Reductant Heater "A" Control Circuit Low
P20BC Reductant Heater "A" Control Circuit High
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DESCRIPTION

Refer to DTC P202B.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P20BB Reductant Heater "A" Control Circuit Low When the urea tube with heater is operating, an open or short circuit occurs in the urea tube with heater circuit for 3 seconds or more (1 trip detection logic).

  • Open or short in urea tube with heater assembly circuit

  • Urea tube with heater assembly

  • Urea pump control ECU

 Comes on DTC stored
P20BC Reductant Heater "A" Control Circuit High When the urea tube with heater is operating, an open or short circuit occurs in the urea tube with heater circuit for 3 seconds or more (1 trip detection logic).

  • Open or short in urea tube with heater assembly circuit

  • Urea tube with heater assembly

  • Urea pump control ECU

 Comes on DTC stored
Table 1. Related Data List
DTC No. Data List

P20BB

P20BC

 Reductant Pipe Heater
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CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern

P20BB

P20BC

 Reductant Pipe Heater (Active Test)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

Read freeze frame data using the GTS. 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.

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PROCEDURE


  1. Click here

    INSPECT UREA TUBE WITH HEATER ASSEMBLY


    1. Disconnect the urea tube with heater assembly connector.

    2. A01SJF8C04
      *a

      Component without harness connected

      (to Urea Tube with Heater Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 6.39 to 7.81 Ω
      Result
      Result
      OK
      NG

  2. *a Front view of wire harness connector (to Urea Tube with Heater Assembly) *b Front view of wire harness connector (to Urea Pump Control ECU)
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    CHECK HARNESS AND CONNECTOR (UREA TUBE WITH HEATER ASSEMBLY - UREA PUMP CONTROL ECU)


    1. Disconnect the urea tube with heater assembly connector.

    2. Disconnect the urea pump control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      g5-2 (HTUL) - g1-20 (HTL) Always Below 1 Ω
      g5-1 (GND) - g1-32 (EHTL) Always Below 1 Ω
      g5-2 (HTUL) or g1-20 (HTL) - Body ground and other terminals Always 10 kΩ or higher
      g5-1 (GND) or g1-32 (EHTL) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

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    CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.


      1. Powertrain > Engine > Clear DTCs


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

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

    6. Enter the following menus: Powertrain / Engine / Active Test / Reductant Pipe Heater.

    7. Perform the Active Test.


      1. Powertrain > Engine > Active Test
        Tester Display
        Reductant Pipe Heater




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

    9. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTC P20BB or P20BC is output A
      DTCs is not output B

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    REPLACE UREA PUMP CONTROL ECU


    1. Replace the urea pump control ECU.

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      Result
      Proceed to
      NEXT

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    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.


      1. Powertrain > Engine > Clear DTCs


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

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

    6. Enter the following menus: Powertrain / Engine / Active Test / Reductant Pipe Heater.

    7. Perform the Active Test.


      1. Powertrain > Engine > Active Test
        Tester Display
        Reductant Pipe Heater




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

    9. Confirm that the DTC is not output again.


      1. Powertrain > Engine > Trouble Codes


      Result
      Proceed to
      NEXT

    • NEXT

      END

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    REPAIR OR REPLACE HARNESS AND CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

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    REPLACE UREA TUBE WITH HEATER ASSEMBLY


    1. Replace the urea tube with heater assembly.

      Result
      Proceed to
      NEXT