DTC P0300: Random Misfire Detected: Notes
DTC P0300 CHART (MZI-3.7)
| DTC P0300 |
Random misfire detected |
| DETECTION CONDITION |
- The PCM monitors the crankshaft position sensor input signal interval time. The PCM calculates the change of the interval time for each cylinder. If the change of interval time exceeds the pre-programmed criteria, the PCM detects a misfire in the corresponding cylinder. When 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 pre-programmed criteria, the PCM determines that a misfire, which can damage the catalytic converter or affect emission performance, has occurred.
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| 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
- Related connector and terminal malfunction
- Related wiring harness malfunction
- CMP sensor malfunction
- CKP sensor malfunction
- Ignition coil malfunction
- Ignition system malfunction
- Excess air suction in intake air system (between MAF/IAT sensor and dynamic chamber)
- Vacuum hoses damages or improper connection
- Fuel pump malfunction
- Fuel pressure regulator malfunction
- Fuel line clogged
- Fuel filter clogged
- Fuel runout
- Poor quality fuel
- Fuel leakage in fuel line
- Insufficient compression
- Variable valve timing control system improper operation
- Purge solenoid valve malfunction
- PCV valve malfunction
- Related connector and terminal malfunction
- Related wiring harness malfunction
- PCM malfunction
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