P1027

P1027

Diagnostic information - DME (DFI)

Fuel high pressure fluctuates

NOTE: The fuel high pressure fluctuates by +/-15 bar from the setpoint fuel pressure.

Diagnostic conditions
- Battery positive voltage more than 9 V
- Engine start detected more than 5 sec.
- Engine temperature -10 °C ... +100 °C (14 °F ... 212 °F)
- Driving with different load and engine-speed ranges

Possible fault causes
- Loose contact or corrosion on connectors or lines --> Fuel high-pressure sensor
- Quantity control valve sluggish (in the fuel high pressure pump)