DTC P0301:00, P0302:00, P0303:00, P0304:00 [L5]: Notes
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSES
| DTC P0301:00 |
Cylinder No. 1 misfire detected |
| DTC P0302:00 |
Cylinder No. 2 misfire detected |
| DTC P0303:00 |
Cylinder No. 3 misfire detected |
| DTC P0304:00 |
Cylinder No. 4 misfire detected |
| DETECTION CONDITION |
- The PCM monitors the 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 the number of misfires that occurred at 200 crankshaft revolutions
and 1, 000 crankshaft revolutions
and calculates the misfire ratio for each crankshaft revolution If the ratio exceeds the preprogrammed criteria, the 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).
- 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 first drive cycle
- PENDING CODE is available if the PCM detects the misfire which affects emission performance during first drive cycle
- FREEZE FRAME DATA is available.
- The DTC is stored in the PCM memory
|
| POSSIBLE CAUSE |
- Erratic signal to PCM
- APP sensor signal malfunction
- ECT sensor signal malfunction
- IAT sensor signal malfunction
- MAF sensor signal malfunction
- CKP sensor signal malfunction
- TP sensor signal malfunction
- VSS signal malfunction
- Ignition system malfunction
- Spark plug malfunction
- Ignition coil related wiring harness malfunction
- Ignition coil connector or terminal malfunction
- Ignition coil malfunction
- Excessive air suction in intake air system (between MAF sensor and intake manifold)
- Fuel injector operation malfunction
- Fuel injector related wiring harness malfunction
- Fuel injector connector or terminal malfunction
- Fuel injector malfunction
- Engine malfunction
- Engine coolant leakage
- Insufficient compression
- PCM malfunction
|