DTC P0301:00, P0302:00, P0303:00 OR P0304:00 [PCM (SKYACTIV-G (US))]
DTC P0301:00, P0302:00, P0303:00 OR P0304:00 [PCM (SKYACTIV-G (US))]
SM2565546
id0102t45001u0
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Note
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• 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 |
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Detection condition
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Determination conditions
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• Any one of the following conditions is met:
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Preconditions
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• Battery voltage: 9—18 V *1
• Engine speed: 500—6,700 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)
• Not cranking
• Not stalling
• 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
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Malfunction determination period
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• 200 rotations of crankshaft (misfire which may damage catalytic converter)
• 1,000 rotations of crankshaft (misfire going against emission regulations)
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Drive cycle
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• 2
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Self test type
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• CMDTC self test
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Sensor used
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• CKP sensor
• MAF sensor
• MAP sensor
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Fail-safe function
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• Limits intake air amount
• Implement fuel-cut control (if the catalytic converter may be damaged, perform fuel-cut on cylinder misfiring the most).
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Vehicle status when DTCs are output
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• Misfiring which may damage catalytic converter (number of drive cycles: 1):
• Drive cycle directly after above drive cycle (number of drive cycles: 2):
• Rough idling, poor acceleration, stalling
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Possible cause
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• Improper operation of ignition system
• Fuel injector malfunction
• Erratic signal to PCM
• Poor drive belt assembly or adhesion of oil
• Drive belt auto tensioner malfunction
• Air leakage from intake air system (between intake manifold and cylinder head)
• Engine malfunction
• PCM malfunction
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System Wiring Diagram
Function Explanation (DTC Detection Outline)
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Repeatability Verification Procedure
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Note
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• Match the engine coolant temperature in the recorded freeze frame data/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.
PID Item/Simulation Item Used In Diagnosis
PID/DATA monitor item table
PIDs |
Reference |
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APP1
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APP2
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ECT
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ECT_VOLT
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IAT
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MAF
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MAP
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MAP_VOLT
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MISFIRE_CYL1_CAT
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MISFIRE_CYL2_CAT
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MISFIRE_CYL3_CAT
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MISFIRE_CYL4_CAT
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MISFIRE_CYL1_EMI
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MISFIRE_CYL2_EMI
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MISFIRE_CYL3_EMI
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MISFIRE_CYL4_EMI
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ENG_RPM
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TP_RELAT
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VSS
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Function Inspection Using M-MDS
Step |
Inspection |
Results |
Action |
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1
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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?
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Yes
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Perform repair or diagnosis according to the available information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is the DTC P0301:00, P0302:00, P0303:00 or P0304:00 on freeze frame data?
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Yes
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Go to the next step.
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No
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Go to the troubleshooting procedure for DTC on freeze frame data.
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3
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PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the freeze frame data/snapshot data and diagnostic monitoring test results (misfire related).
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—
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Go to the next step.
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4
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PURPOSE: INSPECT FOR OTHER RELATED DTCs
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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5
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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.)
• Is there a PID item affected by acceleration fluctuation?
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Yes
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Inspect the suspected sensor and related wiring harness.
• If there is any malfunction:
• If there is no malfunction:
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No
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Go to the next step.
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6
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PURPOSE: RECORD NUMBER OF CURRENT MISFIRES FOR USE WITH MISFIRE INSPECTION
• Display the misfire rate and record the number of misfires.
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—
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Go to the next step.
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7
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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-G (WITH CYLINDER DEACTIVATION (US))].) (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• 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.
• Is there a change from the recorded number of misfires?
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Yes
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
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No
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Go to the next step.
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8
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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/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• 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.
• Is there a change from the recorded number of misfires?
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Yes
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 3.
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Troubleshooting Diagnostic Procedure
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― Perform an ignition system parts inspection.
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― Perform a fuel injector control system inspection.
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― Perform an inspection of parts which may be affected by misfire except for ignition-related parts and fuel injection control-related parts.
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― Verify that primary malfunction is resolved and there are no other malfunctions.
Step |
Inspection |
Results |
Action |
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1
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PURPOSE: INSPECT SPARK PLUG FOR MALFUNCTION
• Inspect the applicable part. (See SPARK PLUG INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See SPARK PLUG INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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2
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PURPOSE: INSPECT IGNITION COIL FOR MALFUNCTION
• Inspect the applicable part. (See IGNITION COIL INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See IGNITION COIL INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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3
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PURPOSE: INSPECT FUEL INJECTOR FOR MALFUNCTION
• Inspect the applicable part. (See FUEL INJECTOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See FUEL INJECTOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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4
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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?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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5
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PURPOSE: VERIFY IF POOR DRIVE BELT ASSEMBLY IS CAUSE OF MISFIRE
• Verify the condition of the drive belt assembly. (See DRIVE BELT INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See DRIVE BELT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Assemble drive belt correctly and perform the repair completion verification.
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No
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Go to the next step.
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6
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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?
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Yes
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Remove the foreign matter on the drive belt and perform the repair completion verification.
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No
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Go to the next step.
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7
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PURPOSE: INSPECT DRIVE BELT AUTO TENSIONER FOR MALFUNCTION
• Inspect the applicable part. (See DRIVE BELT AUTO TENSIONER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See DRIVE BELT AUTO TENSIONER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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8
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PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF MISFIRE
• Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See COMPRESSION INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Are compression pressures within specification?
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Yes
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Go to the next step.
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No
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Replace or overhaul the engine and perform the repair completion verification.
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9
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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-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?
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Yes
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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.
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No
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Go to the next step.
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Repair completion verification 1
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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.
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
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-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Go to the next step.
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Repair completion verification 2
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PURPOSE: VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection. (See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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