DTC P0401-00; EGR Flow Insufficient Detected: Notes
NOTE:
- To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".
Details On DTCs
DETECTION CONDITION AND POSSIBLE CAUSE
| DESCRIPTION |
EGR flow insufficient detected |
| DETECTION CONDITION |
Determination conditions |
- When the following condition is met, the EGR volume is lower than the specification for the target value for a continuous specified time.
|
| Preconditions |
- During EGR control
- Engine speed: 1, 200-2, 500 rpm
- Fuel injection amount: 4-50 mm3
/stoke
- Engine torque: 20-240 N.m {2.1-24 kgf.m, 15-177 ft.lbf}
- The following DTCs are not detected:
- MAP sensor: P0107:00, P0108:00
- MAF sensor: P0102:00, P0103:00
- Exhaust gas pressure sensor: P0472:00, P0473:00
- EGR valve control system: P0403:00
- Fuel injector: P0201:00, P0202:00, P0203:00, P0204:00
|
| Drive cycle |
|
| Self test type |
|
| Sensor used |
- EGR valve
- MAF sensor
- MAP sensor
- Exhaust gas pressure sensor
|
| FAIL-SAFE FUNCTION |
|
| VEHICLE STATUS WHEN DTCs ARE OUTPUT |
- The following vehicle conditions differ depending on the type of malfunction
- Illuminates the check engine light
|
| POSSIBLE CAUSE |
- Erratic signal to PCM
- MAF sensor signal malfunction
- MAP sensor signal malfunction
- Input signal part connector or terminals malfunction
- Input signal part related circuit malfunction
- EGR valve malfunction (stuck close)
- Air suction in intake air system between dynamic pressure turbo (DPT) and intake manifold
- EGR system passage malfunction (restriction)
- Exhaust gas pressure sensor malfunction
- PCM malfunction
|