If there happen misfires over the threshold value at #4 cylinder, ECM sets DTC P0304.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Engine roughness through crankshaft speed fluctuation | 1. Poor connection 2. Ignition system 3. Fuel system 4. Intake/exhaust air system 5. Ignition timing 6. Injector |
Enable Conditions |
•
Time after engine start is higher than 25 sec.
•
No CKP sensor error
•
No rough road condition
•
No fuel cut off condition | |
Threshold Value |
•
Misfire rate / cylinder > 10% of total misfire rate (emission threshold)
•
Misfire rate / cylinder > 25% of total misfire rate (catalyst damage threshold) | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
2 driving cycle or Immediately (Blink) |
