ECD SYSTEM, Diagnostic DTC:P20BB, P20BC

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

DESCRIPTION

Refer to DTC P202B Click here.

P20BB
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Reductant Pipe Heater (Active Test)

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
P20BC
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Reductant Pipe Heater (Active Test)

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
Related Data List
DTC No. Data List

P20BB

P20BC

 Reductant Pipe Heater

WIRING DIAGRAM

B007Q7QE06

INSPECTION PROCEDURE

Tech Tips

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.

PROCEDURE


  1. INSPECT UREA TUBE WITH HEATER ASSEMBLY


    1. Disconnect the urea tube with heater assembly connector.

    2. B007SVJE01
      Text in Illustration
      *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

    NG

    REPLACE UREA TUBE WITH HEATER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (UREA TUBE WITH HEATER ASSEMBLY - UREA PUMP CONTROL ECU)

    B007PLFE01
    Text in Illustration
    *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)

    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
      A46-2(HTUL) - A45-20(HTL) Always Below 1 Ω
      A46-1(GND) - A45-32(EHTL) Always Below 1 Ω
      A46-2(HTUL) or A45-20(HTL) - Body ground Always 10 kΩ or higher
      A46-1(GND) or A45-32(EHTL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR Click here

    OK

  3. CLEAR DTC


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs Click here.

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


    NEXT

  4. CHECK DTC OUTPUT


    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 and ECT / Active Test / Reductant Pipe Heater.

    4. Perform the Active Test.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs.

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

    B

    END

    A

  5. REPLACE UREA PUMP CONTROL ECU


    1. Replace the urea pump control ECU Click here.


    NEXT

  6. CLEAR DTC


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs Click here.

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


    NEXT

  7. CHECK DTC OUTPUT


    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 and ECT / Active Test / Reductant Pipe Heater.

    4. Perform the Active Test.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Confirm that the DTC is not output again.


    NEXT

    END

  8. REPAIR OR REPLACE HARNESS AND CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CLEAR DTC Click here

  9. REPLACE UREA TUBE WITH HEATER ASSEMBLY


    1. Replace the urea tube with heater assembly Click here.


    NEXT

    CLEAR DTC Click here