DTC P0300:00 [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]
id0102h9703200
Details On DTCs
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 DESCRIPTION  | 
 Random 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—4,500 rpm*1 
•  Engine coolant temperature: 20 °C {68 °F} or more*1 
•  Fuel-cut control not implemented 
•  Crankshaft installation tolerance learning completed 
•  Engine condition is stabilized (not directly after gear change) 
*1: Value can be verified by displaying PIDs using the 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)
 am6zzw00011822 
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Repeatability Verification Procedure
PID Item/Simulation Item Used In Diagnosis
PID/DATA monitor item table
| 
 Item  | 
 Definition  | 
 Unit  | 
 Condition/Specification  | 
|---|---|---|---|
| 
 APP1 
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 Accelerator pedal opening angle (absolute value) input from APP sensor No.1 
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 % 
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 •  Accelerator pedal released: Approx. 15% 
•  Accelerator pedal fully depressed: Approx. 82% 
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 APP sensor No.1 voltage 
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 V 
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 •  Accelerator pedal released: Approx. 0.75 V 
•  Accelerator pedal fully depressed: Approx. 4.1 V 
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 APP2 
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 Accelerator pedal opening angle (absolute value) input from APP sensor No.2 
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 % 
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 •  Accelerator pedal released: Approx. 7.45% 
•  Accelerator pedal fully depressed: Approx. 41% 
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 APP sensor No.2 voltage 
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 V 
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 •  Accelerator pedal released: Approx. 0.38 V 
•  Accelerator pedal fully depressed: Approx. 2.05 V 
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 ECT 
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 Engine coolant temperature 
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 °C, °F 
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 •  Displays ECT 
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 ECT sensor voltage 
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 V 
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 •  ECT is 20 °C {68 °F}: Approx. 3.10 V 
•  ECT is 40 °C {104 °F}: Approx. 2.16 V 
•  ECT is 60 °C {140 °F}: Approx. 1.40 V 
•  ECT is 80 °C {176 °F}: Approx. 0.87 V 
•  ECT is 100 °C {212 °F}: Approx. 0.54 V 
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 IAT 
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 Intake air temperature (No.1) 
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 °C, °F 
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 •  Displays IAT (No.1) 
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 IAT sensor No.1 voltage 
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 V 
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 •  IAT is 20 °C {68 °F}: Approx. 2.70 V 
•  IAT is 40 °C {104 °F}: Approx. 1.80 V 
•  IAT is 60 °C {140 °F}: Approx. 1.20 V 
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| 
 MAF 
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 Mass air flow 
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 g/Sec 
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 •  Displays MAF 
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 MAF sensor voltage 
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 V 
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 •  Ignition switched ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V 
•  Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.86 V 
•  Racing (engine speed is 2,000 rpm) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.07 V 
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 MAP 
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 Manifold absolute pressure 
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 KPa {MPa}, mBar {Bar}, psi, in H20 
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 •  Displays MAP 
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 MAP sensor voltage 
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 V 
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 •  Ignition switched ON (engine off) (MAP:101 kPa {1.03 kgf/cm2, 14.6 psi}): Approx. 4.07 V 
•  Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm2, 4.8 psi}): Approx. 1.34 V 
•  Racing (engine speed is 2,000 rpm) (MAP: 26 kPa {0.27 kgf/cm2, 3.8 psi}): Approx. 1.05 V 
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 MF_CAT1 
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 Number of misfires in No.1 cylinder leading to catalytic converter temperature increase (catalytic converter temperature increases due to fuel combustion around catalytic converter after misfire) 
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 — 
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 •  Displays number of misfires corresponding to possible catalytic converter damage (No.1 cylinder) 
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 MF_CAT_2 
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 Number of misfires in No.2 cylinder leading to catalytic converter temperature increase (catalytic converter temperature increases due to fuel combustion around catalytic converter after misfire) 
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 — 
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 •  Displays number of misfires corresponding to possible catalytic converter damage (No.2 cylinder) 
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 MF_CAT_3 
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 Number of misfires in No.3 cylinder leading to catalytic converter temperature increase (catalytic converter temperature increases due to fuel combustion around catalytic converter after misfire) 
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 — 
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 •  Displays number of misfires corresponding to possible catalytic converter damage (No.3 cylinder) 
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 MF_CAT_4 
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 Number of misfires in No.4 cylinder leading to catalytic converter temperature increase (catalytic converter temperature increases due to fuel combustion around catalytic converter after misfire) 
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 — 
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 •  Displays number of misfires corresponding to possible catalytic converter damage (No.4 cylinder) 
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 MF_EMI1 
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 Number of misfires in No.1 cylinder under conditions required by emission regulations 
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 — 
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 •  Displays number of misfires possibly affecting emission (No.1 cylinder) 
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 MF_EMI_2 
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 Number of misfires in No.2 cylinder under conditions required by emission regulations 
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 — 
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 •  Displays number of misfires possibly affecting emission (No.2 cylinder) 
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 MF_EMI_3 
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 Number of misfires in No.3 cylinder under conditions required by emission regulations 
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 — 
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 •  Displays number of misfires possibly affecting emission (No.3 cylinder) 
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 MF_EMI_4 
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 Number of misfires in No.4 cylinder under conditions required by emission regulations 
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 — 
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 •  Displays number of misfires possibly affecting emission (No.4 cylinder) 
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 RPM 
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 Engine speed 
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 RPM 
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 •  Displays engine speed 
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 TP_REL 
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 Throttle valve opening angle (relative value) with value at throttle valve fully open timing as the start point 
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 % 
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 •  Accelerator pedal released: Approx. 12% 
•  Accelerator pedal fully depressed: Approx. 82% 
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 VSS 
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 Vehicle speed 
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 KPH, MPH 
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 •  Displays vehicle speed 
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Function Inspection Using M-MDS
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 STEP  | 
 INSPECTION  | 
 RESULTS  | 
 ACTION  | 
|---|---|---|---|
| 
 1 
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 PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY 
•  Verify related Service Information availability. 
•  Is any related Service Information available? 
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 Yes 
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 Perform repair or diagnosis according to the available Service 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 (MODE 2) 
•  Is the DTC P0300:00 on FREEZE FRAME DATA (Mode 2)? 
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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 (Mode 2). 
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 3 
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 PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION 
•  Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded? 
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 Yes 
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 Go to the next step. 
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 No 
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 Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step. 
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 4 
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 PURPOSE: 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.
 
•  Are any other PENDING CODEs and/or DTCs present? 
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 Yes 
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 Go to the applicable PENDING CODE or DTC inspection. 
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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:
 
 •  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 DURING NO LOAD TO SPECIFY MISFIRING CYLINDER 
•  Start the engine. 
•  Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off. 
•  Under no-load conditions (P or N position (ATX)/neutral (MTX)), increase the engine speed to 3,000 rpm and hold for 30 s. 
•  Verify the number of misfires. 
 •  Can a misfire be verified? 
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 Yes 
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 Record each of the verified values, then go to the next step. 
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 No 
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 Go to step 9. 
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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.
 
•  Start the engine. 
•  Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off. 
•  Under no-load conditions (P or N position (ATX)/neutral (MTX)), increase the engine speed to 3,000 rpm and hold for 30 s. 
•  Verify the number of misfires. 
 •  Is there a change from the recorded number of misfires in Step 6? 
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 Yes 
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 Go to the troubleshooting 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.
 
•  Start the engine. 
•  Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off. 
•  Under no-load conditions (P or N position (ATX)/neutral (MTX)), increase the engine speed to 3,000 rpm and hold for 30 s. 
•  Verify the number of misfires. 
 •  Is there a change from the recorded number of misfires in Step 6? 
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 Yes 
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 Go to the troubleshooting procedure to perform the procedure from Step 2. 
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 No 
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 Go to the troubleshooting procedure to perform the procedure from Step 3. 
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| 
 9 
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 PURPOSE: RECORD NUMBER OF CURRENT MISFIRES WHILE DRIVING UNDER LOAD TO SPECIFY MISFIRING CYLINDER 
•  Start the engine. 
 •  Verify the number of misfires while the vehicle is being driven for 1 min under the condition of the freeze frame data (mode 2) recorded in Step 3. 
 •  Can a misfire be verified? 
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 Yes 
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 Record each of the verified values, then go to the next step. 
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 No 
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 Referring to the service questioning results, verify the misfire rate again with the driving mode data added before recording the freeze frame data (mode 2)/snap shot data. 
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 10 
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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.
 
•  Start the engine. 
 •  Verify the number of misfires while the vehicle is being driven for 1 min under the condition of the freeze frame data (mode 2) recorded in Step 9. 
 •  Is there a change from the recorded number of misfires in Step 9? 
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 Yes 
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 Go to the troubleshooting 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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 11 
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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.
 
•  Start the engine. 
 •  Verify the number of misfires while the vehicle is being driven for 1 min under the condition of the freeze frame data (mode 2) recorded in Step 9. 
 •  Is there a change from the recorded number of misfires in Step 9? 
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 Yes 
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 Go to the troubleshooting procedure to perform the procedure from Step 2. 
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 No 
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 Go to the troubleshooting procedure to perform the procedure from Step 3. 
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Troubleshooting Diagnostic Procedure
| 
 STEP  | 
 INSPECTION  | 
 RESULTS  | 
 ACTION  | 
|---|---|---|---|
| 
 1 
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 PURPOSE: DETERMINE INTEGRITY OF SPARK PLUG 
•  Inspect the spark plug.
 
•  Is there any malfunction? 
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 Yes 
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 Replace the spark plug, then go to Step 10. 
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 No 
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 Go to the next step. 
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 2 
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 PURPOSE: DETERMINE INTEGRITY OF IGNITION COIL 
•  Inspect the ignition coil.
 
•  Is there any malfunction? 
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 Yes 
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 Replace the ignition coil/ion sensor, then go to Step 10. 
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 No 
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 Go to the next step. 
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 3 
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 PURPOSE: DETERMINE INTEGRITY OF FUEL INJECTOR 
•  Inspect the fuel injector.
 
•  Is there any malfunction? 
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 Yes 
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 Replace the fuel injector, then go to Step 10. 
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 No 
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 Go to the next step. 
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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 part according to the inspection results, then go to Step 10. 
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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.
 
•  Is there any malfunction? 
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 Yes 
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 Assemble drive belt correctly, then go to Step 10. 
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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, then go to Step 10. 
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 No 
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 Go to the next step. 
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| 
 7 
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 PURPOSE: DETERMINE INTEGRITY OF DRIVE BELT AUTO TENSIONER 
•  Inspect the drive belt auto tensioner.
 
•  Is there any malfunction? 
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 Yes 
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 Replace the drive belt auto tensioner, then go to Step 10. 
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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 MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF MISFIRE 
•  Inspect the engine compression.
 
•  Are compression pressures within specification? 
Specification: 
•  Compression [SKYACTIV-G 1.5] 
 •  Compression [SKYACTIV-G 2.0, European (L.H.D. U.K.) specs.] 
 •  Compression [SKYACTIV-G 2.0, Except European (L.H.D. U.K.) specs.] 
 •  Compression [SKYACTIV-G 2.5] 
 
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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, then go to Step 10. 
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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”.
 
•  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. 
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 No 
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 Go to the next step. 
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 10 
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 PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION 
•  Always reconnect all disconnected connectors. 
•  Clear the DTC from the PCM memory using the M-MDS.
 
•  Implement the repeatability verification procedure.
 
•  Perform the Pending Trouble Code Access Procedure.
 
•  Is the PENDING CODE for this DTC present? 
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 Yes 
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 Repeat the inspection from Step 1. 
•  If the malfunction recurs, replace the PCM.
 
Go to the next step. 
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 No 
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 Go to the next step. 
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 11 
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 PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION 
•  Is any other DTC or pending code stored? 
 | 
 Yes 
 | 
 Go to the applicable DTC inspection. 
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 No 
 | 
 DTC troubleshooting completed. 
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