DTC P221C:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)]

id0102k1726600

DTC P221C:00

Urea hose heater control circuit low input
DETECTION CONDITION
•  The dosing control unit detects that the urea hose heater resistance is specified value or less.
MONITORING CONDITIONS
―  Ignition switched ON (engine off or on)
―  Urea hose heater is activated for a continuous 50 s.
―  Battery voltage: 8—16 V
―  The following DTCs are not detected:
•  Urea hose heater: P20BD:00, P20BF:00, P20C0:00
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 an intermittent monitor (CCM).
•  The check engine light illuminates if the dosing control unit detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for same malfunction has been stored in the dosing control unit.
•  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.
•  Leave the vehicle for 5 min.
•  Start the engine and leave it idling for 1 min.
•  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.