48D0

48D0 - P0471

Information saved in
DDE

Fault code
48D0 - P0471

Fault text
Exhaust backpressure sensor before turbine, plausibility:
Pressure before turbocharger too low (not plausible in rel. to
charge-air pressure and ambient pressure)

Fault description
Plausibilization of exhaut-gas pressure sensor with boost-
pressure sensor and ambient pressure sensor.
If the difference between the exhaust-gas pressure and the
average of ambient pressure and pressure on the downstream
side of the intercooler lies below the limit value and if these
reference pressures are approximately equal, then - provided
that the operating point is valid - the exhaust-gas pressure
sensor is registered as defective and the diagnostic trouble
code is logged.

Condition for fault identification
Test condition:
Terminal 15 on and engine stationary for at least 400 ms.
Voltage condition:
Terminal 15 on and engine stationary for at least 400 ms.

Condition for fault memory entry
Debounce (500 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
Replace exhaust-gas pressure sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Important notice: If additional diagnostic trouble codes
related to the engine have been logged (boost pressure hose
fallen off, mass airflow control deviation, defect in air-
induction system) then these should receive priority
attention, because this fault can also occur as a collateral
error!