P0300

DTC P0300 / P0301 / P0302 / P0303 / P0304: Random Misfire Detected / Cylinder 1 / Cylinder 2 / Cylinder 3 / Cylinder 4 Misfire Detected

System Description
ECM measure the angle of the crankshaft based on the pulse signal from the CKP sensor and CMP sensor for each cylinder. If it detects a large change in the angle speed of the crankshaft, it concludes occurrence of a misfire. When the number of misfire is counted by ECM beyond the DTC detecting condition, it determine the cylinder where the misfire occurred and output it as DTC.

DTC Detecting Condition and Trouble Area

DTC Detecting Condition And Trouble Area:

DTC Confirmation Procedure

WARNING:
^ When performing a road test, select a place where there is no traffic or possibility of a traffic accident and very careful during testing to avoid occurrence of an accident.
^ Road test should be carried out with 2 persons, a driver and a tester, on a level road.

NOTE: Check to make sure that the following conditions are satisfied when using this "DTC Confirmation Procedure".

EVAP leak check model:
^ The following DTCs are not detected: DTCs related to MAF sensor, CKP sensor and CMP sensor

Non-EVAP-leak-check model:
^ Intake air temperature at engine start: -10 °C (14 °F) to 80 °C (176 °F)
^ Intake air temperature: -10 °C (14 °F) to 70 °C (158 °F)
^ Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
^ The following DTCs are not detected: DTCs related to MAF sensor, ECT sensor, IAT sensor, barometric pressure sensor, TP sensor, CKP sensor and CMP sensor

1. With ignition switch turned OFF, connect scan tool.
2. Turn ON ignition switch and print Freeze Frame Data or write them down using scan tool.
3. Clear DTC using scan tool.
4. Drive vehicle under freeze frame data condition as noted for 1 min. or more.
5. Stop vehicle and check DTC and pending DTC.

DTC Troubleshooting

Step 1-9:

Step 10: