P14D0

4C87 - P14D0

Information saved in
DDE

Fault code
4C87 - P14D0

Fault text
DDE: Low-pressure exhaust-gas recirculation cooler,
plausibility: Cooler efficiency too low

Fault description
Monitoring of adapted low-pressure EGR cooler efficiency.
The diagnostic trouble code is logged when the cooler
efficiency rises above the limit 0 or falls below the limit 0.

Condition for fault identification
Test condition:
To allow recognition of the error the model should not be in
the learning phase.
The learning phase is completed once the efficiency level
has been successfully adapted. The adaptation function is
enabled when:
- the low-pressure EGR valve's travel feedback exceeds a
limit value.
- the coolant temperature is greater than 40 �C.
the error check proceeds continuously in the defined process
grid.
Voltage condition:
To allow recognition of the error the model should not be in
the learning phase.
The learning phase is completed once the efficiency level
has been successfully adapted. The adaptation function is
enabled when:
- the low-pressure EGR valve's travel feedback exceeds a
limit value.
- the coolant temperature is greater than 40 �C.
the error check proceeds continuously in the defined process
grid.

Condition for fault memory entry
Debounce (10000 ms)

Action in service
Check low-pressure EGR cooler for contamination, replace
low-pressure EGR cooler as indicated.

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

Driver information
Warning light:
MIL

Service instruction
none