If there is happened misfires over the threshold value at #3 cylinder, the ECM sets DTC P0303.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Calculation of Engine Roughness | 1. Poor connection 2. Ignition system 3. Fuel system 4. Intake/exhaust air system 5. Ignition timing 6. Injector | |
Case 1 | Enable Conditions |
•
510 rpm < Engine speed < 6500 rpm
•
Engine load > Zero torque
•
Time after engine start > 0 sec
•
ECT at starting below -7℃(19.4 °F) > 21 ℃(69.8 °F), Else ECT ≥ -7 ℃(19.4 °F)
•
No rough road detection
•
Remark : (Rough Road Condition Check) Wheel acceleration < 30~40 m/s | |
Threshold Value |
•
Misfire rate > 3.0% per 1000 rev. | ||
Diagnostic Time |
•
1000 rev. | ||
MIL ON Condition |
•
2 driving cycle | ||
Case 2 | Enable Conditions |
•
510 rpm < Engine speed < 6500 rpm
•
Engine load > Zero torque
•
Time after engine start > 0 sec
•
ECT at starting > -10 °C(14 °F) | |
Threshold Value |
•
Catalyst temperature over 1050 °C(1922 °F) > 6~20% | ||
Diagnostic Time |
•
200 rev. | ||
MIL ON Condition |
•
1 driving cycle | ||
