4640 - P0088 (DDE)

4640 - P0088

Information saved in
DDE

Fault code
4640 - P0088

Fault text
DDE: Rail-pressure plausibility pressure-controlled:
Maximum pressure exceeded

Fault description
Monitoring maximum rail pressure with rail-pressure control
valve regulating fuel rail pressure. The diagnostic trouble
code is logged when the monitored rail pressure is higher
than the limit 1750 bar.

Condition for fault identification
Test condition:
The test routine runs only when the following conditions are
satisfied:
- Rail pressure control with rail-pressure control valve, or
rail pressure control with rail-pressure control valve and
fuel-quantity control valve.
- Monitoring is enabled.
Voltage condition:
The test routine runs only when the following conditions are
satisfied:
- Rail pressure control with rail-pressure control valve, or
rail pressure control with rail-pressure control valve and
fuel-quantity control valve.
- Monitoring is enabled.

Condition for fault memory entry
Debounce (240 ms)

Action in service
Check the following potential problem sources:
- Rail-pressure control valve sticking shut.
- Electrical malfunction results in continuous power to the
rail-pressure control valve.
- Filter screen in rail-pressure control valve is obstructed.
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