P0401 is set when ECM detects that duty amount of EGR actuator control valve, ENG speed or amount of EGR is exceeded to minimum set point last. In this case, check that stuck of EGR actuator, air leakage of intake line.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Signal monitoring | 1. EGR actuator stuck 2. EGR actuator component 3. Air leakage of intake line | ||
Enable Conditions |
•
Engine running | |||
Threshold value |
•
EGR is exceeded to minimum set point. | |||
Diagnosis Time |
•
1 sec. | |||
Fail Safe | Fuel cut | NO |
•
- | |
EGR Off | YES | |||
Fuel Limit | YES | |||
Check Lamp | ON | |||
