P14A6

4D99 - P14A6

Information saved in
DDE

Fault code
4D99 - P14A6

Fault text
DDE: Particulate filter system: minimum differential
pressure after regeneration undershot

Fault description
The diagnostic trouble code is logged when the stored
maximum value for differential pressure after correction
with the current differential pressure offset is less than a
threshold based on operating point.
The threshold is calculated based on a characteristic curve
using the volumetric flow rate of the exhaust gas and is
equal to roughly 4 hPa.

Condition for fault identification
Test condition:
The following conditions must be met for the error check:
- The maximum volumetric flow rate in the current driving
cycle must lie above the threshold 350 m^3/h.
- The current differential pressure offset must be completely
calculated in the shutdown phase.
- The diagnostic trouble code 25C800 and 4D03 must be
completely tested and should not be active.
Voltage condition:
The following conditions must be met for the error check:
- The maximum volumetric flow rate in the current driving
cycle must lie above the threshold 350 m^3/h.
- The current differential pressure offset must be completely
calculated in the shutdown phase.
- The diagnostic trouble code 25C800 and 4D03 must be
completely tested and should not be active.

Condition for fault memory entry
Debounce (1000 ms)

Action in service
-

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none