P0304

SYSTEM DESCRIPTION
ECM (PCM) 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 (PCM) 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 CONFIRMATION PROCEDURE

NOTE: Check to make sure that following conditions are satisfied when using this 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 to avoid occurrence of an accident.
- Road test, should be carried out with 2 person, a driver and tester, on a level road.

- Intake air temperature: between -14°C and 70°C (6.8°F and 158°F)
- Atmospheric pressure: higher than 560 mm.Hg (Altitude: lower than 2790 m (9150 ft))
- Following DTCs are not detected: P0335 and P0340

1. With ignition switch OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC by using scan tool if any.
3. Operate vehicle within freeze frame data condition as noted for 1 min.
4. Stop vehicle and check DTC and pending DTC by using scan tool.




DTC TROUBLESHOOTING (DTC PO304)