4C5E - P2002 (DDE)

4C5E - P2002

Information saved in
DDE

Fault code
4C5E - P2002

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

Fault description
To monitor the particulate filter the measured differential
pressure is compared with a threshold. If the differential
pressure is below this threshold then a removed filter or
substantial damage is detected. The monitoring limit is
stored in the program map where it is defined based on the
volumetric flow rate and the continuously simulated soot
mass in the particulate filter. The monitoring function thus
makes it possible to detect damage when the filter is empty
and to assesss operational plausibility by monitoring the
progressive increase in the pressure differential that
accompanies higher loads and greater accumulations of
carbon deposits.

Condition for fault identification
Test condition:
The error check is run on a continuous basis in a 100 ms
grid whenever the following conditions are satisfied:
- Active regeneration in progress.
- The volumetric flow rate is above 700 m^3/h.
Voltage condition:
The error check is run on a continuous basis in a 100 ms
grid whenever the following conditions are satisfied:
- Active regeneration in progress.
- The volumetric flow rate is above 700 m^3/h.

Condition for fault memory entry
Debounce (2500 ms)
E90-M57D30T2-AT-LEVII:
Debounce (4000 ms)

Action in service
1. Inspect to determine whether filter could be removed
(carbon accumulation at tailpipe tip).
2. If soot is present on the end of the tailpipe and the end of
the filter then the filter is defective.
3. If no soot is present on the end of the filter and at the
trailpipe tip but the diagnostic trouble code has still been
logged: Hose to differential-pressure sensor has fallen off or
the sensor is defective (in which case a diagnostic trouble
code for the differential-pressure sensor would also be
logged).

Fault effect and breakdown warning
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL

Service instruction
If the differential-pressure sensor is defective then a
diagnostic trouble code for the differential-pressure sensor
would also be stored.