DTC P0301, P0302, P0303, P0304: Notes
DTC P0301, P0302, P0303, P0304 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0301 |
Cylinder No. 1 misfire detection |
| DTC P0302 |
Cylinder No. 2 misfire detection |
| DTC P0303 |
Cylinder No. 3 misfire detection |
| DTC P0304 |
Cylinder No. 4 misfire detection |
| DETECTION CONDITION |
- PCM monitors crankshaft position sensor input signal interval time. PCM calculates the change of the interval time for each cylinder. If the change of interval time exceeds the preprogrammed criteria, PCM detects a misfire in the corresponding cylinder. While the engine is running, PCM counts the number of misfires that occurred at 200 crankshaft revolutions
and 1, 000 crankshaft revolutions
and calculates misfire ratio for each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, PCM determines that a misfire, which can damage the catalytic converter or affect emission performance, has occurred.
Diagnostic support note
- This is a continuous monitor (Misfire).
- MIL illuminates if PCM detects the misfire which affects emission performance in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM.
- PENDING CODE is available if PCM detects the misfire which affects emission performance during first drive cycle.
- MIL flashes if PCM detects the misfire which can damage the catalytic converter during first drive cycle.
- FREEZE FRAME DATA is available.
- DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Spark plug malfunction
- Ignition system malfunction
- Fuel injector malfunction
- Air suction in intake air system (between dynamic chamber and cylinder head)
- Inadequate engine compression due to engine internal malfunction
- Related connector or terminal malfunction
- Related wiring harness malfunction
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