DTC P20BF:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)]

id0102k1723700

DTC P20BF:00

Urea hose heater control circuit low input
DETECTION CONDITION
•  If any of the following conditions is met under condition A or condition B:
Condition A:
•  If the dosing control unit detects that the urea hose heater control circuit voltage is above 0 V and 0.35 V or less for 2 s, the dosing control unit determines that the urea hose heater control circuit has a malfunction.
MONITORING CONDITIONS
―  Ignition switched ON (engine off or on)
―  Urea hose heater is activated.
―  Battery voltage: 10.9—16 V
Condition B:
•  If the dosing control unit detects that the urea hose heater control circuit voltage is more than 1.46 V for 2 s, the dosing control unit determines that the urea hose heater control circuit has a malfunction.
MONITORING CONDITIONS
―  Ignition switched ON (engine off or on)
―  Urea hose heater is activated.
―  Battery voltage: 10.9—16 V
Note
•  DTC P2BAF:00 is also stored in the PCM and the vehicle speed is restricted.
•  DTC P1640:00 is also stored in the PCM.
•  P0615:00 may be stored if the remaining distance to empty is 0 km {0 mile} and the engine cannot be restarted.
Diagnostic support note
•  This is a continuous monitor (CCM).
•  The check engine light illuminates if the dosing control unit detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA/Snapshot data is available.
•  DTC is stored in the dosing control unit memory.
FAIL-SAFE FUNCTION
•  Restricts the maximum remaining distance to empty.
•  Limits the upper limit of the engine speed.
POSSIBLE CAUSE
•  Urea hose heater connector or terminals malfunction
•  Open circuit in wiring harness between the urea hose heater terminal A and body ground
•  Dosing control unit connector or terminals malfunction
•  Short to ground in wiring harness between the urea hose heater terminal B and dosing control unit terminal F
•  Open circuit in wiring harness between the urea hose heater terminal B and dosing control unit terminal F
•  Urea hose heater malfunction
•  Dosing control unit malfunction

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
INSPECT UREA HOSE HEATER CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the urea hose heater connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 8.
No
Go to the next step.
3
INSPECT UREA HOSE HEATER GROUND CIRCUIT FOR OPEN CIRCUIT
•  Verify that the urea hose heater connector is disconnected.
•  Inspect for continuity between the urea hose heater terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the urea hose heater terminal A and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Inspect for the following:
―  Open circuit between urea hose heater and body ground
―  Loose or lifting ground point
•  Repair or replace the malfunctioning part.
Go to Step 8.
4
INSPECT DOSING CONTROL UNIT CONNECTOR CONDITION
•  Disconnect the dosing control unit connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 8.
No
Go to the next step.
5
INSPECT UREA HOSE HEATER CIRCUIT FOR SHORT TO GROUND
•  Verify that the urea hose heater and dosing control unit connectors are disconnected.
•  Inspect for continuity between the urea hose heater terminal B (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the urea hose heater terminal B and dosing control unit terminal F.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 8.
No
Go to the next step.
6
INSPECT UREA HOSE HEATER CIRCUIT FOR OPEN CIRCUIT
•  Verify that the urea hose heater and dosing control unit connectors are disconnected.
•  Inspect for continuity between the urea hose heater terminal B (wiring harness-side) and dosing control unit terminal F (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the urea hose heater terminal B and dosing control unit terminal F.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 8.
7
INSPECT UREA HOSE HEATER
•  Inspect the urea hose heater.
•  Is there any malfunction?
Yes
Replace the urea hose, then go to the next step.
(See UREA TANK REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
No
Go to the next step.
8
VERIFY THAT ENGINE CAN BE STARTED
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the dosing control unit memory using the M-MDS.
Note
•  The engine cannot be restarted when the remaining distance to empty is 0 km {0 mile}.
•  Start the engine.
•  Can the engine be started?
Yes
Go to the next step.
No
Perform the “SCR INDUCEMENT INSPECTION SERVICE FUNCTION” using the M-MDS.
(See SCR INDUCEMENT INSPECTION SERVICE FUNCTION [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)
Note
•  When restriction of the remaining distance to empty is canceled, the SCR system warning light/SCR system warning indication turns off.
Go to the next step.
9
IMPLEMENT THE REPEATABILITY VERIFICATION PROCEDURE
•  Always reconnect all disconnected connectors.
•  Idle the engine for 60 s.
•  Has the restriction of the remaining distance to empty been canceled?
Yes
Go to the next step.
No
Repeat the inspection from Step 8.
10
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Retrieve the dosing control unit DTCs using the M-MDS.
•  Is the same Pending DTC present?
Yes
Go to the next step.
No
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the dosing control unit.
Go to the next step.
11
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)
No
DTC troubleshooting completed.