Manufacturer Code Charts: 4590

4590 - P0087

Information saved in
DDE

Fault code
4590 - P0087

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

Fault description
Monitoring minimum rail pressure with fuel-quantity 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 lies between
120 bar and 140 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.
- Monitoring is enabled.
Voltage condition:
The test routine runs only when the following conditions are
satisfied:
- Rail-pressure control from fuel-quantity control valve is
active.
- 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.
- 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