4580 - P0088 (DDE)

4580 - P0088

Information saved in
DDE

Fault code
4580 - P0088

Fault text
DDE: Rail-pressure plausibility delivery-controlled: Rail
pressure too high with maximum activation, delivery control
valve (RA negative)

Fault description
Monitoring for negative control deviation (rail pressure too
high) when fuel-quantity control valve regulates rail
pressure at delivery rate of zero.
The diagnostic trouble code is logged when the negative
control deviation is less than the limit defined by the
operating point and the volumetric flow rate defined for the
fuel-quantity control valve is less than or equal to the limit -
1650 mm^3/s.
The limit defined by operating point is calculated based on
engine rpm and lies at roughly -300 bar.

Condition for fault identification
Test condition:
The test routine runs only when the following conditions are
satisfied:
- Rail-pressure control from fuel-quantity control valve is
active.
- The injection quantity must exceed 4 mg/hub.
- The fuel temperature must be greater than -40 �C.
Voltage condition:
The test routine runs only when the following conditions are
satisfied:
- Rail-pressure control from fuel-quantity control valve is
active.
- The injection quantity must exceed 4 mg/hub.
- The fuel temperature must be greater than -40 �C.

Condition for fault memory entry
Debounce (2000 ms)

Action in service
Check the following potential problem sources:
- Possible faults in fuel pre-supply system: pre-supply
pressure is too high.
- Fuel-quantity control valve sticking in open position.
- Fuel-quantity control valve has no power owing to
electrical malfunction.
Investigate potential problem sources, conduct rail-pressure
control system test.

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

Driver information
Warning light:
MIL_SVS

Service instruction
none