DTC P0301, P0302, P0303, P0304: Notes
DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0301, P0302, P0303, P0304)
| DTC P0301 |
Cylinder No.1 misfire detected |
| DTC P0302 |
Cylinder No.2 misfire detected |
| DTC P0303 |
Cylinder No.3 misfire detected |
| DTC P0304 |
Cylinder No.4 misfire detected |
| DETECTION CONDITION |
- The PCM monitors CKP sensor input signal interval time. The PCM calculates the change of interval time for each cylinder. If the change of interval time exceeds the preprogrammed criteria, the PCM detects a misfire in the corresponding cylinder. While the engine is running, the PCM counts 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, the PCM determines that a misfire, which can damage catalytic converter or affect emission performance, has occurred.
Diagnostic support note
- This is a continuous monitor (Misfire).
- The MIL illuminates if the PCM detects the misfire which affects emission performance in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- The MIL flashes if the PCM detects the misfire which can damage the catalytic converter during the first drive cycle.
- PENDING CODE is available if the PCM detects the misfire which affects emission performance during the first drive cycle.
- FREEZE FRAME DATA is available.
- The 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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