DTC P220A:00 [PCM (SKYACTIV-D)]

Description	NOx sensor: power supply voltage malfunction
Detection condition	Determination conditions	• The NOx sensor internal supply voltage is not within the specified value for a continuous 30 s.
	Preconditions	• Battery voltage: 10.9—16 V • CAN communication is normal at engine start for a continuous 20 s or more • The following DTCs is not detected: ― NOx sensor: U029D:00
	Drive cycle	• 1
	Self test type	• CMDTC self test
	Sensor used	• NOx sensor • PCM
Fail-safe	• Inhibits the DENOx/DESOx control.
Vehicle status when dtcs are output	• Not applicable.
Possible cause	• NOx sensor connector or terminals malfunction • PCM connector or terminals malfunction • SCR relay malfunction • F13 15 A fuse malfunction • Short to ground in SCR relay power supply circuit • Short to ground in NOx sensor power supply circuit • Open circuit in NOx sensor power supply circuit • Open circuit in SCR relay ground circuit • NOx sensor malfunction ― Internal malfunction • PCM malfunction

• NOx sensor performs diagnosis independently and if it detects a power supply voltage malfunction, it sends a malfunction signal to the PCM.

When the malfunction signal is received from NOx sensor, the PCM stores a DTC.

Step	Inspection	Results	Action
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: VERIFY DTC CAUSING FREEZE FRAME DATA • Is DTC P220A:00 causing the freeze frame data?	Yes	Go to the next step.
2		No	Inspect the DTC causing the freeze frame data. (See DTC TABLE [PCM (SKYACTIV-D)].)
3	PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

• Repair completion verification

Step	Inspection	Results	Action
1	PURPOSE: INSPECT NOx SENSOR CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification.
2	PURPOSE: INSPECT SCR relay • Switch the ignition off. • Remove the SCR relay. (See RELAY LOCATION [(E)].) • Inspect the SCR relay. (See RELAY INSPECTION.) • Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See RELAY LOCATION [(E)].)
2		No	Go to the next step.
3	PURPOSE: INSPECT F13 15 A FUSE • Remove the F13 15 A Fuse. • Inspect the F13 15 A Fuse. • Is the fuse normal?	Yes	Reinstall the F13 15 A Fuse, then go to the next step.
3		No	Replace the F13 15 A Fuse and perform the repair completion verification.
4	PURPOSE: INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	PURPOSE: INSPECT SCR RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	PURPOSE: INSPECT NOx SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	PURPOSE: INSPECT SCR RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	PURPOSE: INSPECT NOx SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	PURPOSE: INSPECT NOx SENSOR FOR MALFUNCTION • Inspect the applicable part. (See NOx SENSOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See NOx SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Implement the repeatability verification procedure. (See Repeatability Verification Procedure) • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.

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