4630 - P0087 (DDE)

4630 - P0087

Information saved in
DDE

Fault code
4630 - P0087

Fault text
DDE: Rail-pressure plausibility pressure-controlled:
Minimum pressure undershot

Fault description
Monitoring minimum rail pressure with rail-pressure control
valve regulating fuel rail pressure. The DTC is logged when
the monitored rail pressure is less than the limit value
calibrated against flow quantity of zero.
The limit is calculated based on engine rpm and is 120 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 (300 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
Attempt to restart the engine after a terminal power-status
switch.
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL_SVS

Service instruction
none