DTC P0138:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)]

id0102k1702600

Note

• To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION

NOx sensor No.1 (oxygen concentration) circuit high input

DETECTION CONDITION

Determination conditions

•  The oxygen concentration output by NOx sensor No.1 exceeds the specification for a continuous 0.5 s.

Preconditions

•  NOx sensor No.1 is activating

•  Ignition has been switched ON (engine on) for 20 s or more

•  Battery voltage: 10.9—16 V

•  The following DTCs are not detected:

―  NOx sensor No.1: P2200:00, U029D:00

Malfunction determination period

•  0.5 s

Drive cycle

•  1

Self test type

•  CMDTC self test

Sensor used

•  NOx sensor No.1

•  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.1 connector or terminals malfunction

•  Dosing control unit connector or terminals malfunction

•  NOx sensor No.1 malfunction

•  Dosing control unit malfunction

DESCRIPTION	NOx sensor No.1 (oxygen concentration) circuit high input
DETECTION CONDITION	Determination conditions	• The oxygen concentration output by NOx sensor No.1 exceeds the specification for a continuous 0.5 s.
Preconditions	• NOx sensor No.1 is activating • Ignition has been switched ON (engine on) for 20 s or more • Battery voltage: 10.9—16 V • The following DTCs are not detected: ― NOx sensor No.1: P2200:00, U029D:00
Malfunction determination period	• 0.5 s
Drive cycle	• 1
Self test type	• CMDTC self test
Sensor used	• NOx sensor No.1 • 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.1 connector or terminals malfunction • Dosing control unit connector or terminals malfunction • NOx sensor No.1 malfunction • Dosing control unit malfunction

System Wiring Diagram

• Not applicable

Function Explanation (DTC Detection Outline)

• The dosing control unit receives the oxygen concentration in the exhaust gas based on the NOx sensor No.1 signal. The dosing control unit determines a NOx sensor No.1 signal error and stores a DTC based on the condition in which the oxygen concentration detected by NOx sensor No.1 continues to be more than the specification.

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_B1S1	NOx sensor No.1	— (ppm)	• Displays the exhaust gas NOx concentration before SCR converter

Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION

1

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.1) on the repair order.

—

Go to the next step.

2

PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY OTHER RELATED DTCs OCCURRING

•  Switch the ignition off, then ON (engine off).

•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

•  Is the PENDING CODE/DTC P2200:00 or U029D:00 also present?

Yes

Go to the applicable DTC inspection.

(See DTC P2200:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

(See DTC U029D:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].)

Repair or replace the applicable wiring harness or connector parts.

Go to the troubleshooting procedure to perform the procedure from Step 4.

No

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_B1S1

•  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_B1S1

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

―  NOx sensor No.1

―  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: 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.1) on the repair order.	—	Go to the next step.
2	PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY OTHER RELATED DTCs OCCURRING • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. • Is the PENDING CODE/DTC P2200:00 or U029D:00 also present?	Yes	Go to the applicable DTC inspection. (See DTC P2200:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) (See DTC U029D:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) Repair or replace the applicable wiring harness or connector parts. Go to the troubleshooting procedure to perform the procedure from Step 4.
No	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_B1S1 • 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_B1S1 • When the following parts are shaken, does the PID value include a PID item which has changed? ― NOx sensor No.1 ― 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

― Perform a unit inspection of the NOx sensor No.1.

• Step 2—3

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

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: DETERMINE INTEGRITY OF NOx SENSOR No.1

•  Inspect the NOx sensor No.1.
(See NOx SENSOR INSPECTION [SKYACTIV-D 2.2].)

•  Is there any malfunction?

Yes

Replace the NOx sensor No.1, then go to the next step.

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

No

Go to the next step.

2

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.

3

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: DETERMINE INTEGRITY OF NOx SENSOR No.1 • Inspect the NOx sensor No.1. (See NOx SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Replace the NOx sensor No.1, then go to the next step. (See NOx SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
1		No	Go to the next step.
2	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.
2		No	Go to the next step.
3	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)].)
3		No	DTC troubleshooting completed.