P0303

DTC P0303: Cylinder 3 Misfire Detected

System Description
ECM (PCM) measures the angle speed 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 the ECM (PCM) beyond the DTC detecting condition, it determines the cylinder where the misfire occurred and outputs it as DTC.

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 be 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".
- Intake air temperature: -8 - 70 °C (18 - 158 °F)
- Engine coolant temperature: -8 °C (18 °F) or higher
- Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
- Fuel level indication on meter cluster: 1/4 or more

1. Connect scan tool to DLC with ignition switch OFF.
2. Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool and start engine.
3. Increase vehicle speed to speed recorded as freeze frame data (V) ± 5 km/h when detecting misfire.
4. Keep driving above vehicle speed for 5 min.
5. Stop vehicle and check DTC (or pending DTC) by using scan tool.

Step 1 - 7:

Step 8 - 9:

DTC Troubleshooting