DTC P0301:00, P0302:00, P0303:00, P0304:00 [PCM (SKYACTIV-D)]

System malfunction location	P0301:00: Cylinder No.1 misfire P0302:00: Cylinder No.2 misfire P0303:00: Cylinder No.3 misfire P0304:00: Cylinder No.4 misfire
Detection condition	• The misfire rate of specific cylinders relative to the crankshaft speed exceeds the specified value continuously for a specified period of time when all of the following conditions are met. ― There is a record of driving the vehicle with all of the following conditions met. • Deceleration with accelerator pedal released from engine speed of 1,500 rpm (from engine speed at deceleration start to 1,150 rpm) • Fuel injection amount control: during fuel cut • Speed ratio fluctuation or time fluctuation for each cylinder is specified value or less ― Fuel injection pattern or A/C relay operation condition is not switched directly before. ― Post injection is not being performed during deceleration and no load ― Gear is not being shifted ― Change in accelerator opening angle is specified value or less ― Speed ratio fluctuation for each cylinder is specified value or less ― Fuel injection amount is specified value or more ― Engine coolant temperature: 30 °C {86 °F} or more
Fail-safe	• Inhibits the diesel particulate filter regeneration control. • Inhibits the DENOx/DESOx control. • Inhibits the EGR control.
Possible cause	• Out of fuel • Inferior fuel added • Leakage from fuel system • Fuel injector malfunction • Poor engine compression • Air suction or clogging into intake air system (between airflow sensor and intake manifold) • Crankshaft position sensor malfunction • Crankshaft plate damage • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

System malfunction location

P0301:00: Cylinder No.1 misfire

P0302:00: Cylinder No.2 misfire

P0303:00: Cylinder No.3 misfire

P0304:00: Cylinder No.4 misfire

Detection condition

• The misfire rate of specific cylinders relative to the crankshaft speed exceeds the specified value continuously for a specified period of time when all of the following conditions are met.

― There is a record of driving the vehicle with all of the following conditions met.

• Deceleration with accelerator pedal released from engine speed of 1,500 rpm (from engine speed at deceleration start to 1,150 rpm)

• Fuel injection amount control: during fuel cut

• Speed ratio fluctuation or time fluctuation for each cylinder is specified value or less

― Fuel injection pattern or A/C relay operation condition is not switched directly before.

― Post injection is not being performed during deceleration and no load

― Gear is not being shifted

― Change in accelerator opening angle is specified value or less

― Speed ratio fluctuation for each cylinder is specified value or less

― Fuel injection amount is specified value or more

― Engine coolant temperature: 30 °C {86 °F} or more

Fail-safe

• Inhibits the diesel particulate filter regeneration control.

• Inhibits the DENOx/DESOx control.

• Inhibits the EGR control.

Possible cause

• Out of fuel

• Inferior fuel added

• Leakage from fuel system

• Fuel injector malfunction

• Poor engine compression

• Air suction or clogging into intake air system (between airflow sensor and intake manifold)

• Crankshaft position sensor malfunction

• Crankshaft plate damage

• PCM malfunction

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

Step	Inspection	Results	Action
1	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.
No	Go to the next step.
2	VERIFY DTC CAUSING FREEZE FRAME DATA • Is DTC P0301:00, P0302:00, P0303:00, or P0304:00 causing the freeze frame data?	Yes	Go to the next step.
No	Inspect the DTC causing the freeze frame data. (See DTC TABLE [PCM (SKYACTIV-D)].)
3	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 the next step.
4	VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting first, then go to the next step. (See DTC TABLE [PCM (SKYACTIV-D)].)
No	Go to the next step.
5	INSPECT FOR FUEL LEAKAGE FROM FUEL LINE OR CLOGGING • Inspect the following fuel line for fuel leakage or clogging. ― Between supply pump and common rail ― Between common rail and fuel injector • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
No	Go to the next step.
6	VERIFY RELATED SENSOR INPUT SIGNAL • Start the engine and warm it up completely. • Access the following PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION.) ― ECT ― IAT ― MAF ― RPM ― APP ― VSS ― FRP • Are the monitoring values normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, then go to repair completion verification.
7	VERIFY INPUT SIGNAL FROM RELATED SENSOR WHILE DRIVING UNDER LOAD • Start the engine and warm it up completely. • Drive the vehicle under the condition of the FREEZE FRAME DATA recorded in Step 2 and display the following PIDs using the M-MDS under this condition. (See PID/DATA MONITOR INSPECTION.) ― ECT ― IAT ― MAF ― RPM ― APP ― VSS ― FRP • Are the monitoring values normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, then go to repair completion verification.
8	INSPECT FUEL INJECTORS No.1 TO No.4 FOR MALFUNCTION • Inspect the applicable part. (See FUEL INJECTOR INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
9	INSPECT ENGINE COMPRESSION FOR MALFUNCTION • Inspect the applicable part. (See COMPRESSION INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See DTC INSPECTION.)
Repair completion verification 1	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. ― Start the engine and warm it up completely. Caution • While performing this step, always operate the vehicle in a safe and lawful manner. • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. ― Drive the vehicle under the FREEZE FRAME DATA/snapshot data condition. • 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].)
No	Go to the next step.
Repair completion verification 2	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.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

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.

Go to the next step.

VERIFY DTC CAUSING FREEZE FRAME DATA

• Is DTC P0301:00, P0302:00, P0303:00, or P0304:00 causing the freeze frame data?

Yes

Go to the next step.

Inspect the DTC causing the freeze frame data.

(See DTC TABLE [PCM (SKYACTIV-D)].)

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 the next step.

VERIFY RELATED PENDING CODE AND/OR DTC

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

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

(See DTC INSPECTION.)

• Are any DTCs present?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting first, then go to the next step.

(See DTC TABLE [PCM (SKYACTIV-D)].)

Go to the next step.

INSPECT FOR FUEL LEAKAGE FROM FUEL LINE OR CLOGGING

• Inspect the following fuel line for fuel leakage or clogging.

― Between supply pump and common rail

― Between common rail and fuel injector

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.

Go to the next step.

VERIFY RELATED SENSOR INPUT SIGNAL

• Start the engine and warm it up completely.

• Access the following PIDs using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

― ECT

― IAT

― MAF

― RPM

― APP

― VSS

― FRP

• Are the monitoring values normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, then go to repair completion verification.

VERIFY INPUT SIGNAL FROM RELATED SENSOR WHILE DRIVING UNDER LOAD

• Start the engine and warm it up completely.

• Drive the vehicle under the condition of the FREEZE FRAME DATA recorded in Step 2 and display the following PIDs using the M-MDS under this condition.

(See PID/DATA MONITOR INSPECTION.)

― ECT

― IAT

― MAF

― RPM

― APP

― VSS

― FRP

• Are the monitoring values normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, then go to repair completion verification.

INSPECT FUEL INJECTORS No.1 TO No.4 FOR MALFUNCTION

• Inspect the applicable part.

(See FUEL INJECTOR INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

INSPECT ENGINE COMPRESSION FOR MALFUNCTION

• Inspect the applicable part.

(See COMPRESSION INSPECTION [SKYACTIV-D 1.8].)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See DTC INSPECTION.)

Repair completion verification 1

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.

― Start the engine and warm it up completely.

Caution

• While performing this step, always operate the vehicle in a safe and lawful manner.

• When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

― Drive the vehicle under the FREEZE FRAME DATA/snapshot data condition.

• 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].)

Go to the next step.

Repair completion verification 2