Dtc P20Bb Reductant Heater A Control Circuit Low


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT UREA TUBE WITH HEATER ASSEMBLY

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

CLEAR DTC

CHECK DTC OUTPUT

REPLACE UREA PUMP CONTROL ECU

CLEAR DTC

CHECK DTC OUTPUT

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE UREA TUBE WITH HEATER ASSEMBLY

DTC P20BB Reductant Heater "A" Control Circuit Low

DTC P20BC Reductant Heater "A" Control Circuit High


DESCRIPTION

Refer to DTC P202B (LandCruiser RM000005UUE000X_01.html).

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)
  1. Open or short in urea tube with heater assembly circuit
  2. Urea tube with heater assembly
  3. 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)
  1. Open or short in urea tube with heater assembly circuit
  2. Urea tube with heater assembly
  3. Urea pump control ECU

Related Data List
DTC No.
Data List
P20BB
P20BC
Reductant Pipe Heater

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P20Bb Reductant Heater A Control Circuit Low


INSPECTION PROCEDURE

HINT:
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.
1.INSPECT UREA TUBE WITH HEATER ASSEMBLY

  1. Disconnect the urea tube with heater assembly connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P20Bb Reductant Heater A Control Circuit Low

  1. 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
    Text in Illustration
    *a
    		Component without harness connected
    (to Urea Tube with Heater Assembly)


NG
Go to step 9
OK


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

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P20Bb Reductant Heater A Control Circuit Low


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.

  1. Disconnect the urea pump control ECU connector.

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


Standard Resistance::

Tester Connection
Condition
Specified Condition
s1-1(HTUL) - s3-20(HTL)
Always
Below 1 Ω
s1-2(GND1) - s3-32(EHTL)
Always
Below 1 Ω
s1-1(HTUL) or s3-20(HTL) - Body ground
Always
10 kΩ or higher
s1-2(GND1) or s3-32(EHTL) - Body ground
Always
10 kΩ or higher


NG
Go to step 8
OK


3.CLEAR DTC

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000PDK1E5X.html).

  1. Turn the engine switch off and wait for 30 seconds or more.


NEXT


4.CHECK DTC OUTPUT

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Reductant Pipe Heater.

  1. Perform the Active Test.

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

  1. 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 (LandCruiser RM000005UL0000X.html).


NEXT


6.CLEAR DTC

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000PDK1E5X.html).

  1. Turn the engine switch off and wait for 30 seconds or more.


NEXT


7.CHECK DTC OUTPUT

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Reductant Pipe Heater.

  1. Perform the Active Test.

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

  1. 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
Go to step 6

9.REPLACE UREA TUBE WITH HEATER ASSEMBLY

  1. Replace the urea tube with heater assembly (LandCruiser RM000005UL0000X_01_0002.html).



NEXT
Go to step 6