DTC P22A1:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)]

id0102k1727500

Details On DTCs

DESCRIPTION

NOx sensor No.2 circuit high input

DETECTION CONDITION

Determination conditions

•  When any of the following conditions is met:

―  The NOx concentration output by NOx sensor No.2 is more than 2,900 ppm for a continuous 8 s.

―  The oxygen concentration output by NOx sensor No.2 is more than 0.29 labda for a continuous 0.5 s.

Preconditions

•  CAN communication condition is normal

•  Diesel particulate filter regeneration control is not operating for a continuous 5 min or more.

•  Battery voltage: 10.9—16 V

•  Ignition switched ON (engine off or on)

•  The estimated urea deposit (white crystals) amount does not exceed the specified value.

•  The following DTCs is not detected:

―  P229E:00, U029E:00

Drive cycle

•  2

Self test type

•  CMDTC self test

Sensor used

•  NOx sensor No.2

•  Dosing control unit

FAIL-SAFE FUNCTION

•  Not applicable

VEHICLE STATUS WHEN DTCs ARE OUTPUT

•  DTC P1640:00 is also stored in the PCM.

POSSIBLE CAUSE

•  NOx sensor No.2 connector or terminals malfunction

•  There is urea deposit (white crystals) accumulation between urea injector and SCR converter

•  Dosing control unit connector or terminals malfunction

•  CAN communication line between NOx sensor No.2 and dosing control unit malfunction

―  NOx sensor No.2 terminal B—dosing control unit terminal BK

―  NOx sensor No.2 terminal C—dosing control unit terminal BL

•  NOx sensor No.2 malfunction

•  Dosing control unit malfunction

DESCRIPTION	NOx sensor No.2 circuit high input
DETECTION CONDITION	Determination conditions	• When any of the following conditions is met: ― The NOx concentration output by NOx sensor No.2 is more than 2,900 ppm for a continuous 8 s. ― The oxygen concentration output by NOx sensor No.2 is more than 0.29 labda for a continuous 0.5 s.
Preconditions	• CAN communication condition is normal • Diesel particulate filter regeneration control is not operating for a continuous 5 min or more. • Battery voltage: 10.9—16 V • Ignition switched ON (engine off or on) • The estimated urea deposit (white crystals) amount does not exceed the specified value. • The following DTCs is not detected: ― P229E:00, U029E:00
Drive cycle	• 2
Self test type	• CMDTC self test
Sensor used	• NOx sensor No.2 • Dosing control unit
FAIL-SAFE FUNCTION	• Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• DTC P1640:00 is also stored in the PCM.
POSSIBLE CAUSE	• NOx sensor No.2 connector or terminals malfunction • There is urea deposit (white crystals) accumulation between urea injector and SCR converter • Dosing control unit connector or terminals malfunction • CAN communication line between NOx sensor No.2 and dosing control unit malfunction ― NOx sensor No.2 terminal B—dosing control unit terminal BK ― NOx sensor No.2 terminal C—dosing control unit terminal BL • NOx sensor No.2 malfunction • Dosing control unit malfunction

System Wiring Diagram

• Not applicable

Function Explanation (DTC Detection Outline)

• The dosing control unit receives the NOx concentration and oxygen concentration based on the NOx sensor No.1 signal.

• If the NOx concentration or the oxygen concentration exceeds the threshold estimated from the engine performance, the dosing control unit stores a DTC.

Repeatability Verification Procedure

1. Perform the "COMPULSORY DIESEL PARTICULATE FILTER REGENERATION". (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 2.2].)

2. Idle the engine for 3 min.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

—: Not applicable

Item	Definition	Unit	Condition/Specification
NOX_C_B1S2	NOx sensor No.2	— (ppm)	• Displays the exhaust gas NOx concentration after SCR converter

Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: 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

PURPOSE: RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION

Note

•  Recording can be facilitated using the screen capture function of the PC.

•  Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (NOx sensor No.2) on the repair order.

—

Go to the next step.

3

PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM OR DOSING CONTROL UNIT

•  Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

―  NOX_C_B1S2

•  Is there any signal that is far out of specification?

Yes

Go to the next step.

No

Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.

4

PURPOSE: VERIFY CONNECTOR CONNECTIONS

•  Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

―  NOX_C_B1S2

•  When the following parts are shaken, does the PID value include a PID item which has changed?

―  NOx sensor No.2

―  Dosing control unit

Yes

Inspect the related wiring harness and connector.

•  Repair or replace the malfunctioning part.

No

Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: 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	PURPOSE: RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (NOx sensor No.2) on the repair order.	—	Go to the next step.
3	PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM OR DOSING CONTROL UNIT • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) ― NOX_C_B1S2 • Is there any signal that is far out of specification?	Yes	Go to the next step.
No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.
4	PURPOSE: VERIFY CONNECTOR CONNECTIONS • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) ― NOX_C_B1S2 • When the following parts are shaken, does the PID value include a PID item which has changed? ― NOx sensor No.2 ― Dosing control unit	Yes	Inspect the related wiring harness and connector. • Repair or replace the malfunctioning part.
No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

• Step 1

― Inspect between the urea injector and the SCR converter for a malfunction.

• Step 2

― Perform a unit inspection of the NOx sensor No.2.

• Step 3—4

― Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: VERIFY IF THERE IS UREA DEPOSIT (WHITE CRYSTALS) ACCUMULATION BETWEEN UREA INJECTOR AND SCR CONVERTER

•  Verify if there is urea deposit (white crystals) accumulation between the urea injector and the SCR converter.
(See UREA INJECTOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

•  Is there urea deposit (white crystals) accumulation between the urea injector and the SCR converter?

Yes

Perform compulsory diesel particulate filter regeneration.

(See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 2.2].)

Reprogram the PCM, then go to the next step.

No

Go to the next step.

2

PURPOSE: DETERMINE INTEGRITY OF NOx SENSOR No.2

•  Inspect the NOx sensor No.2.
(See NOx SENSOR INSPECTION [SKYACTIV-D 2.2].)

•  Is there any malfunction?

Yes

Replace the NOx sensor No.2, then go to the next step.

(See NOx SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

No

CAN communication line can be considered the cause.

•  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

―  NOx sensor No.2 terminal B—dosing control unit terminal BK

―  NOx sensor No.2 terminal C—dosing control unit terminal BL

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 malfunction.

―  Repair or replace the malfunctioning part.

If there is no common connector:

―  Repair or replace the wiring harness.

If the malfunction recurs, replace the dosing control unit.

(See DOSING CONTROL UNIT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

Go to the next step.

3

PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

•  Clear the DTC from the dosing control unit memory using the M-MDS.
(See CLEARING DTC [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

•  Implement the repeatability verification procedure.
(See Repeatability Verification Procedure.)

•  Perform the Pending Trouble Code Access Procedure.
(See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

•  Is the same Pending DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the dosing control unit.
(See DOSING CONTROL UNIT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

Go to the next step.

No

Go to the next step.

4

PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION

•  Is any other DTC or pending code stored?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

No

DTC troubleshooting completed.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY IF THERE IS UREA DEPOSIT (WHITE CRYSTALS) ACCUMULATION BETWEEN UREA INJECTOR AND SCR CONVERTER • Verify if there is urea deposit (white crystals) accumulation between the urea injector and the SCR converter. (See UREA INJECTOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) • Is there urea deposit (white crystals) accumulation between the urea injector and the SCR converter?	Yes	Perform compulsory diesel particulate filter regeneration. (See COMPULSORY DIESEL PARTICULATE FILTER REGENERATION [SKYACTIV-D 2.2].) Reprogram the PCM, then go to the next step.
1		No	Go to the next step.
2	PURPOSE: DETERMINE INTEGRITY OF NOx SENSOR No.2 • Inspect the NOx sensor No.2. (See NOx SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Replace the NOx sensor No.2, then go to the next step. (See NOx SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
2		No	CAN communication line can be considered the cause. • Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: ― NOx sensor No.2 terminal B—dosing control unit terminal BK ― NOx sensor No.2 terminal C—dosing control unit terminal BL 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 malfunction. ― Repair or replace the malfunctioning part. If there is no common connector: ― Repair or replace the wiring harness. If the malfunction recurs, replace the dosing control unit. (See DOSING CONTROL UNIT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to the next step.
3	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION • Clear the DTC from the dosing control unit memory using the M-MDS. (See CLEARING DTC [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the dosing control unit. (See DOSING CONTROL UNIT REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to the next step.
3		No	Go to the next step.
4	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION • Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)
4		No	DTC troubleshooting completed.