4620 - P0088 (DDE)

4620 - P0088

Information saved in
DDE

Fault code
4620 - P0088

Fault text
DDE: Rail-pressure plausibility pressure-controlled: Rail
pressure too high/negative control deviation with minimum
activation, pressure control valve

Fault description
Monitoring for negative control deviation (rail pressure too
high) and excessively low rail-pressure control-valve control
variable with rail pressure control from rail-pressure control
valve.
The diagnostic trouble code is logged when the negative
control deviation falls below the limit -250 bar and when the
control variable is less than or equal to the limit 20 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 (2000 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
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL_SVS

Service instruction
none