If there is happened misfires over the threshold value at #1 cylinder, the ECM/PCM sets DTC P0301.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Calculation of Engine Roughness | 1. Poor connection 2. Ignition system 3. Fuel system | |
Enable Conditions |
•
Engine load ratio > 14 to 64% (depends on eng speed,ECT)
•
470rpm < Engine speed < 6700rpm
•
Ambient pressure (model) > 75kPa
•
Engine load ratio gradient < 12 to 60%/s
•
Throttle gradient < 58.6 to 1265.6%/s
•
Engine Coolant Temperature(ECT) > 20°C if start temp. < -7 °C
•
11V < Battery voltage < 16V
•
Fuel cut off not active
•
No rough load condition : moving mean value of wheel speed signal gradient > 13 ~ 25% | ||
Threshold Value | Case1 |
•
2.0% within1000 rev. for SULEV | |
Case2 |
•
10 % ... 50 % within 200 revs | ||
Diagnostic Time | Case1 |
•
1000 revs or 4×1000 revs | |
Case2 |
•
200 revs or 3 x 200 revs | ||
MIL ON Condition | Case1 |
•
2 driving cycles | |
Case2 |
•
1 driving cycles | ||
