P12A2

P12A2

Diagnosis information - Control unit DME (DFI)

Fuel high-pressure sensor implausible

INFORMATION
- Faults in the fuel high-pressure injection system are often caused by defects in the pre-delivery system (fuel low pressure).
- Therefore, if there are problems in the fuel high-pressure injection area, the pre-delivery circuit must be checked first.

Diagnostic conditions
- Period since engine was started > 250 Second(s)
- Engine temperature -10 ... +100 °C (°F)
- Engine speed 450 ... 4000 1/min
- Lambda control Active

Possible fault causes
- Pre-delivery quantity or pressure in fuel low-pressure circuit too low
- Fuel high-pressure system leaks
- Fuel high-pressure sensor Faulty
- Fuel high-pressure pump Faulty

Fault setting condition(s)
- long-term deviation Fuel high-pressure actual value - Nominal value
(The setpoint is calculated using several values. , e.g. Lambda control, Quantity control valve, ...)