27C4

27C4 - P2227

Information saved in
DME

Fault code
27C4 - P2227

Fault text
Ambient barometric pressure, plausibility

Fault description


Condition for fault identification
Test condition:
Cummulative WOT/full-load time > 30 sec.
(also possible in both P modes at low n in high gears)
Terminal condition: Engine running

Condition for fault memory entry
abs(pumg_modell-pumg_roh)>
K_PUMG_OBD_MODELeerlauf_DELTA_Max

Action in service
1. Delete stored DTCs from error memory
2. Read out value and compare with current ambient
barometric pressure (use real pressure and not pressure
adjusted to sea level (roughly 100 mbar drop of roughly
1000 mbar for each 100 meters of altitude)
3. If defect is still present - replace DME ECU

Fault effect and breakdown warning
pumg sensor value is within plausible range,
but shows substantial deviation from model value, or
displays an implausibly steep gradient

Driver information
Warning light:
No

Service instruction
none