P321E

48E1 - P321E

Information saved in
DDE

Fault code
48E1 - P321E

Fault text
Ambient pressure sensor (installed in DDE control unit),
plausibility: Ambient pressure too high (not plausible in rel.
to pressure before turbocharger and charge-air pressure)

Fault description
Plausibilization of ambient pressure sensor with exhaust-gas
pressure and boost pressure.
The diagnostic trouble code is logged when the difference
between the ambient barometric pressure and the average of
boost pressure and exhaust-gas pressure is above the limit
130 mbar and these reference pressures are roughly equal
(difference less than 150 mbar).

Condition for fault identification
Test condition:
The plausibility test runs when one of the valid operating
ranges is active:
Engine in standby mode: Status transition from wake-up for
at least 0 s.
Terminal 15 on:
- Terminal 15 on for at least 400 ms.
- Engine rpm lower than 0 1/min.
Engine in start phase:
- Engine speed between 16384 1/min and 16384 1/min.
- Terminal 50 active.
During extended idling phase and with low particulate filter
content:
- Engine running.
- Operating range valid for at least 200 ms.
- Engine speed between 10 1/min and 10 1/min.
- Injection quantity lies between 0 mg/Hub and 328 mg/Hub.
- Throttle valve value less than 100 %.
- Maximum value for particulate filter load quantity less
than 0 g.
- Period since last regeneration greater than 200 s.
- Vehicle speed less than 10 km/h.
Engine is in shutdown phase for at least 2500 ms.
Voltage condition:
The plausibility test runs when one of the valid operating
ranges is active:
Engine in standby mode: Status transition from wake-up for
at least 0 s.
Terminal 15 on:
- Terminal 15 on for at least 400 ms.
- Engine rpm lower than 0 1/min.
Engine in start phase:
- Engine speed between 16384 1/min and 16384 1/min.
- Terminal 50 active.
During extended idling phase and with low particulate filter
content:
- Engine running.
- Operating range valid for at least 200 ms.
- Engine speed between 10 1/min and 10 1/min.
- Injection quantity lies between 0 mg/Hub and 328 mg/Hub.
- Throttle valve value less than 100 %.
- Maximum value for particulate filter load quantity less
than 0 g.
- Period since last regeneration greater than 200 s.
- Vehicle speed less than 10 km/h.
Engine is in shutdown phase for at least 2500 ms.

Condition for fault memory entry
Debounce (500 ms)

Action in service
Replace DDE control module.

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

Driver information
Warning light:
MIL

Service instruction
none