ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P202B, P202C

DTC Code DTC Name
P202B Reductant Tank Heater Control Circuit Low
P202C Reductant Tank Heater Control Circuit High

DESCRIPTION

An electric heater is provided inside the urea tank and urea pipe, as urea solution freezes at -11°C (12.2°F) or lower.

The heater thaws frozen urea solution and prevents further freezing, allowing the urea SCR system to be started even in cold environments.

The tank heater turns ON and OFF according to the value of the temperature sensor. The heater for the urea tube with heater assembly turns ON and OFF according to the value of the ambient temperature sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P202B Reductant Tank Heater Control Circuit Low When the tank heater is operating, an open or short circuit occurs in the tank heater for 3 seconds or more (1 trip detection logic).

  • Open or short in tank heater circuit

  • Tank heater (urea pump)

  • Urea pump control ECU

 Comes on DTC stored
P202C Reductant Tank Heater Control Circuit High When the tank heater is operating, an open or short circuit occurs in the tank heater for 3 seconds or more (1 trip detection logic).

  • Open or short in tank heater circuit

  • Tank heater (urea pump)

  • Urea pump control ECU

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

P202B

P202C

 Reductant Tank Heater

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern

P202B

P202C

 Reductant Tank Heater (Active Test)

WIRING DIAGRAM

A01SHHXE05

CAUTION / NOTICE / HINT

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 TANK HEATER (UREA PUMP)


    1. Inspect the tank heater (urea pump).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE UREA PUMP Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (TANK HEATER - UREA PUMP CONTROL ECU)

    A01SGU1C12
    *a

    Front view of wire harness connector

    (to Urea Pump)

    		 *b

    Front view of wire harness connector

    (to Urea Pump Control ECU)

    1. Disconnect the urea pump 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
      g6-9 (TH+) - g1-21 (HTT) Always Below 1 Ω
      g6-11 (TH-) - g1-31 (EHTT) Always Below 1 Ω
      g6-9 (TH+) or g1-21 (HTT) - Body ground and other terminals Always 10 kΩ or higher
      g6-11 (TH-) or g1-31 (EHTT) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR Click here

    OK

  3. 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.

    4. Turn the ignition switch off 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 Tank Heater.

    7. Perform the Active Test.


      Powertrain > Engine > Active Test
      Tester Display
      Reductant Tank Heater

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

    9. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P202B or P202C is output A
      No DTC is output B

    B

    END

    A

  4. REPLACE UREA PUMP CONTROL ECU


    1. Replace the urea pump control ECU.

      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.

    4. Turn the ignition switch off 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 Tank Heater.

    7. Perform the Active Test.


      Powertrain > Engine > Active Test
      Tester Display
      Reductant Tank Heater

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

    9. Confirm that the DTC is not output again.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END

  6. REPAIR OR REPLACE HARNESS AND CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here

  7. REPLACE UREA PUMP


    1. Replace the urea pump.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here