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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


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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—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
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
• Implement fuel-cut control (if the catalytic converter may be damaged, perform fuel-cut on cylinder misfiring the most).
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
• Drive belt auto 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

• Not applicable



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

1. Drive the vehicle at a speed of 40 km/h {25 mph} or more.
2. Shift to 3rd gear and rapidly accelerate the vehicle to 60 km/h {37 mph} (to execute misfire monitor).
3. Release the accelerator pedal and decelerate the vehicle to 40 km/h {25 mph}.
4. Repeat Step 1 to 3 operations above 5 times.

Note
• 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.
5. Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the freeze frame data/snapshot data.



PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

PIDs

Reference

APP1
APP2
ECT
ECT_VOLT
IAT
MAF
MAP
MAP_VOLT
MISFIRE_CYL1_CAT
MISFIRE_CYL2_CAT
MISFIRE_CYL3_CAT
MISFIRE_CYL4_CAT
MISFIRE_CYL1_EMI
MISFIRE_CYL2_EMI
MISFIRE_CYL3_EMI
MISFIRE_CYL4_EMI
ENG_RPM
TP_RELAT
VSS



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.
3
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).

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.
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-G (US))].)
• 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-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.
― Access the following PIDs using the M-MDS (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (US))].)
• 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
• 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-G (US))].)
• 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

Intention of troubleshooting procedure
• Step 1—2
― Perform an ignition system parts inspection.
• Step 3
― Perform a fuel injector control system inspection.
• Step 4—9
― Perform an inspection of parts which may be affected by misfire except for ignition-related parts and fuel injection control-related parts.
• Repair completion verification
― Verify that primary malfunction is resolved and there are no other malfunctions.

Step

Inspection

Results

Action

1
PURPOSE: INSPECT SPARK PLUG FOR MALFUNCTION
• Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
2
PURPOSE: INSPECT IGNITION COIL FOR MALFUNCTION
• Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
3
PURPOSE: INSPECT FUEL INJECTOR FOR MALFUNCTION
• Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
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
• Is there any malfunction?
Yes
Assemble drive belt correctly and perform the repair completion verification.
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 DRIVE BELT AUTO TENSIONER FOR MALFUNCTION
• Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
8
PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF MISFIRE
• 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
• 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.
If the CAN communication is normal, perform the diagnosis from Step 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.
No
DTC troubleshooting completed.