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DTC P0301, P0302, P0303, P0304: Notes

DTC P0301, P0302, P0303, P0304 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

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).
  • 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 (Mode 2/Mode 12) is available.
  • DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Erratic signal to PCM
    • ECT sensor
    • MAF sensor
    • TP sensor
    • Related connector or terminal malfunction
    • Related wiring harness malfunction
  • Spark plug malfunction
  • Ignition coil malfunction
  • Ignition system malfunction
  • Air suction in intake air system (between dynamic chamber and cylinder head)
  • Fuel injector related wiring harness malfunction
  • Engine malfunction (Leakage engine coolant)
  • Inadequate engine compression due to engine internal malfunction
  • Fuel injector malfunction
  • PCM malfunction
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