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

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Note

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

Details On DTCs

Description	P0301:00: Cylinder No.1 misfire detected P0302:00: Cylinder No.2 misfire detected P0303:00: Cylinder No.3 misfire detected P0304:00: Cylinder No.4 misfire detected
Detection condition	Determination conditions	•  Any one of the following conditions is met: ―  The misfire rate of specific cylinders for every 200 rotations of the crankshaft exceeds the specified value (misfire which may damage catalytic converter). ―  The misfire rate of specific cylinders for every 1,000 rotations of the crankshaft exceeds the specified value (misfire going against emission regulations).
	Preconditions	•  Battery voltage: 9—18 V*1 •  Engine speed: 500—4,500 rpm*1 •  Engine coolant temperature: −10 °C {14 °F} or more or 21 °C {70 °F} or more*1 (standard differs depending on engine coolant temperature at engine start) •  Fuel-cut control not implemented •  Crankshaft installation tolerance learning completed •  Engine condition is stabilized (not directly after gear change) *1: Standard can be verified by displaying PIDs using M-MDS
	Malfunction determination period	•  200 rotations of crankshaft (misfire which may damage catalytic converter) •  1,000 rotations of crankshaft (misfire going against emission regulations)
	Drive cycle	•  2
	Self test type	•  CMDTC self test
	Sensor used	•  CKP sensor •  MAF sensor •  MAP sensor
Fail-safe function	•  Limits intake air amount. •  Performs fuel-cut control. (If the catalytic converter may be damaged, perform fuel-cut on the cylinder misfiring the most) •  Inhibits the SPCCI control with a large amount of intake air introduced (lean A/F). •  Inhibits the EGR control. (Only when misfiring, which may damage the catalytic converter, is determined)
Vehicle status when DTCs are output	•  Misfiring which may damage catalytic converter (number of drive cycles: 1): ―  Check engine light flashes and pending code is recorded •  Drive cycle directly after above drive cycle (number of drive cycles: 2): ―  Malfunction determined: check engine light is illuminated ―  Normal is determined: Pending code cleared •  Rough idling, poor acceleration, stalling
Possible cause	•  Improper operation of ignition system ―  Spark plug malfunction ―  Ignition coil related wiring harness or connector malfunction ―  Ignition coil malfunction •  Fuel injector malfunction ―  Improper operation of fuel injector ―  Fuel injector related wiring harness malfunction •  Erratic signal to PCM ―  CKP sensor signal malfunction ―  ECT sensor No.1 signal malfunction ―  MAF sensor signal malfunction ―  MAP sensor signal malfunction ―  IAT sensor No.1 signal malfunction ―  APP sensor signal malfunction ―  TP sensor signal malfunction ―  VSS signal malfunction ―  Related connector or terminals malfunction ―  Related wiring harness malfunction •  Poor drive belt assembly or adhesion of oil •  Decoupling ring tensioner malfunction •  Air leakage from intake air system (between intake manifold and cylinder head) •  Engine malfunction ―  Insufficient engine compression ―  Engine coolant leakage to combustion chamber •  PCM malfunction

System Wiring Diagram

Function Explanation (DTC Detection Outline)

•  The PCM detects the crankshaft rotation speed based on the crankshaft position sensor signal. If there is a small amount of fluctuation in crankshaft rotation speed due to the effect of combustion of each cylinder while the engine is rotating and a misfire occurs in any of the pistons, the crankshaft rotation speed will change suddenly. The PCM adds the number of changes in sudden rotation speed (misfire rate) to each specified crankshaft rotation speed, and if the misfire rate exceeds a certain value, a DTC is recorded.

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Repeatability Verification Procedure

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Function Inspection Using M-MDS

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.
		No	Go to the next step.
2	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA •  Is the DTC P0301:00, P0302:00, P0303:00 or P0304:00 on freeze frame data?	Yes	Go to the next step.
		No	Go to the troubleshooting procedure for DTC on freeze frame data. (See DTC TABLE [PCM (SKYACTIV-X)].)
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 the next step.
4	PURPOSE: INSPECT FOR OTHER RELATED DTCs •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].)
		No	Go to the next step.
5	PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM •  Start the engine. •  Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.) ―  APP1 ―  APP2 ―  ECT ―  ECT_VOLT ―  IAT ―  MAF ―  MAP ―  MAP_VOLT ―  ENG_RPM ―  TP_RELAT ―  VSS •  Is there a PID item affected by acceleration fluctuation?	Yes	Inspect the suspected sensor and related wiring harness. •  If there is any malfunction: ―  Repair or replace the malfunctioning part. ―  Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification. •  If there is no malfunction: ―  Go to the next step.
		No	Go to the next step.
6	PURPOSE: RECORD NUMBER OF CURRENT MISFIRES FOR USE WITH MISFIRE INSPECTION •  Display the misfire rate and record the number of misfires. ―  Access the following PIDs using the M-MDS (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-X)].) •  MISFIRE_CYL1_CAT •  MISFIRE_CYL2_CAT •  MISFIRE_CYL3_CAT •  MISFIRE_CYL4_CAT •  MISFIRE_CYL1_EMI •  MISFIRE_CYL2_EMI •  MISFIRE_CYL3_EMI •  MISFIRE_CYL4_EMI	—	Go to the next step.
7	PURPOSE: VERIFY IF MISFIRE CAUSE IS BAD SPARK PLUGS •  Switch the spark plugs on a cylinder that is misfiring and a cylinder that is not misfiring. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) •  Start the engine. •  Verify all accessory loads (A/C, headlights, blower fan, rear window defogger) are off. •  Under no-load conditions (P or N position (ATX)/neutral (MTX)), increase the engine speed to 3,000 rpm. •  Display the misfire rate and record the number of misfires. ―  Access the following PIDs using the M-MDS (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-X)].) •  MISFIRE_CYL1_CAT •  MISFIRE_CYL2_CAT •  MISFIRE_CYL3_CAT •  MISFIRE_CYL4_CAT •  MISFIRE_CYL1_EMI •  MISFIRE_CYL2_EMI •  MISFIRE_CYL3_EMI •  MISFIRE_CYL4_EMI •  Is there a change from the recorded number of misfires?	Yes	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
		No	Go to the next step.
8	PURPOSE: VERIFY IF MISFIRE CAUSE IS BAD IGNITION COIL •  Switch the ignition coils on a cylinder that is misfiring and a cylinder that is not misfiring. (See IGNITION COIL REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) •  Start the engine. •  Verify all accessory loads (A/C, headlights, blower fan, rear window defogger) are off. •  Under no-load conditions (P or N position (ATX)/neutral (MTX)), increase the engine speed to 3,000 rpm. •  Display the misfire rate and record the number of misfires. ―  Access the following PIDs using the M-MDS (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-X)].) •  MISFIRE_CYL1_CAT •  MISFIRE_CYL2_CAT •  MISFIRE_CYL3_CAT •  MISFIRE_CYL4_CAT •  MISFIRE_CYL1_EMI •  MISFIRE_CYL2_EMI •  MISFIRE_CYL3_EMI •  MISFIRE_CYL4_EMI •  Is there a change from the recorded number of misfires?	Yes	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 3.

Troubleshooting Diagnostic Procedure

―  Perform an ignition system parts inspection.

―  Perform a fuel injector control system inspection.

―  Perform an inspection of parts which may be affected by misfire except for ignition-related parts and fuel injection control-related parts.

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

Step	Inspection	Results	Action
1	PURPOSE: INSPECT SPARK PLUG FOR MALFUNCTION •  Inspect the applicable part. (See SPARK PLUG INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
2	PURPOSE: INSPECT IGNITION COIL FOR MALFUNCTION •  Inspect the applicable part. (See IGNITION COIL INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See IGNITION COIL REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
3	PURPOSE: INSPECT FUEL INJECTOR FOR MALFUNCTION •  Inspect the applicable part. (See FUEL INJECTOR INSPECTION [SKYACTIV-X 2.0].) •  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-X 2.0].)
4	PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE-AIR SYSTEM IS CAUSE OF MISFIRE •  Visually inspect for loose, cracked or damaged hoses on intake air system. •  Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
		No	Go to the next step.
5	PURPOSE: VERIFY IF POOR DRIVE BELT ASSEMBLY IS CAUSE OF MISFIRE •  Verify the condition of the drive belt assembly. (See DRIVE BELT INSPECTION [SKYACTIV-X 2.0].) •  Is there any malfunction?	Yes	Assemble drive belt correctly and perform the repair completion verification. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
		No	Go to the next step.
6	PURPOSE: VERIFY IF FOREIGN MATTER ON DRIVE BELT IS CAUSE OF MISFIRE •  Verify if oil is on the drive belt. •  Is there foreign matter on the drive belt?	Yes	Remove the foreign matter on the drive belt and perform the repair completion verification.
		No	Go to the next step.
7	PURPOSE: INSPECT DECOUPLING RING TENSIONER FOR MALFUNCTION •  Inspect the applicable part. (See DECOUPLING RING TENSIONER INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See DECOUPLING RING TENSIONER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
8	PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF MISFIRE •  Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-X 2.0].) •  Are compression pressures within specification?	Yes	Go to the next step.
		No	Replace or overhaul the engine and perform the repair completion verification.
9	PURPOSE: VERIFY IF MALFUNCTION RELATED TO SEALING OF ENGINE UNIT (COMBUSTION CHAMBER AND ENGINE COOLANT PASSAGE) IS CAUSE OF MISFIRE •  Perform the “ENGINE COOLANT LEAKAGE INSPECTION”. (See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-X 2.0].) •  Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?	Yes	Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred. •  Verify the conditions of the gasket and the cylinder head. ―  If there is any malfunction: •  Repair or replace the malfunctioning location and perform the repair completion verification.
		No	Go to the next step.
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-X 2.0].)
		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.
		No	DTC troubleshooting completed.