DTC P2202:00 [DOSING CONTROL UNIT (SKYACTIV-D 2.2)]

DTC P2202:00	NOx sensor No.1 (NOx oxygen concentration) circuit low input
DETECTION CONDITION	Determination conditions	• The NOx concentration output by NOx sensor No.1 is less than -100 ppm for a continuous 8.0 s.
	Preconditions	• NOx sensor No.1 is activating • Ignition has been switched ON (engine on) for 20 s or more • Battery voltage: 10.9—16.0 V • Ignition switched ON (engine off or on) • The following DTCs are not detected: ― NOx sensor No.1: P2200:00, U029D:00
	Drive cycle	• 1
	Self test type	• CMDTC self test
	Sensor used	• NOx sensor No.1 • Dosing control unit
FAIL-SAFE FUNCTION	• Restricts the maximum remaining distance to empty. • Limits the upper limit of the engine speed.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• 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.
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

• The dosing control unit receives the NOx 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 a condition continuing for 8 s in which the oxygen concentration detected by NOx sensor No.1 is less than the specification.

Item	Definition	Unit	Condition/Specification
NOX_C_B1S1	NOx sensor No.1	— (ppm)	• Displays the exhaust gas NOx concentration before SCR converter

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.
1		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.1) on the repair order.	—	Go to the next step.
3	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 2.
3		No	Go to the next step.
4	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.
4		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.
5	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.
5		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from step 1.

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	VERIFY THAT ENGINE CAN BE STARTED • Always reconnect all disconnected connectors. • Clear the DTC from the dosing control unit memory using the M-MDS. (See CLEARING DTC [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) 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.
2		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.
3	IMPLEMENT THE REPEATABILITY VERIFICATION PROCEDURE • Always reconnect all disconnected connectors. • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Has the restriction of the remaining distance to empty been canceled?	Yes	Go to the next step.
3		No	Repeat the inspection from Step 2.
4	VERIFY DTC TROUBLESHOOTING COMPLETED • Retrieve the dosing control unit DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [DOSING CONTROL UNIT (SKYACTIV-D 2.2)].) • Is the same Pending DTC present?	Yes	Go to the next step.
4		No	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.
5	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)].)
5		No	DTC troubleshooting completed.