4600 - P0087 (DDE)

4600 - P0087

Information saved in
DDE

Fault code
4600 - P0087

Fault text
DDE: Rail-pressure plausibility pressure-controlled: Positive
control deviation/rail pressure too low

Fault description
Monitoring for positive control deviation (rail pressure too
low) while rail pressure is being regulated by rail-pressure
control valve. The diagnostic trouble code is logged when
the positive control deviation is greater than the limit
defined by the operating point.
The limit is calculated based on engine rpm and lies between
170 bar and 250 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 (800 ms)

Action in service
Check the following potential problem sources:
- Fuel presupply pressure (low-pressure delivery circuit) is
too low (filter obstructed, leak in low-pressure circuit).
- Rail-pressure sensor indicates incorrect value.
- Leakage in high-pressure circuit.
- Injector is sticking open.
- Worn high-pressure pump.
- Worn injector.
- Leak in rail-pressure control valve.
- Internal leakage in common rail system.
- External leakage in common rail system.
- Air in common rail system.
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