Porsche Cayman S (987) F6-3.4L P Code
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P12A1
Diagnosis information - DME (DFI)
Fuel high-pressure sensor implausible
NOTE:
- Faults in the fuel high- pressure injection area are often caused by defects in the predelivery circuit (fuel low-pressure).
Therefore, if there are problems in the fuel high-pressure injection area, the predelivery circuit must be checked first.
- Diagnosis detects a permanent deviation of the measured fuel high pressure from the calculated fuel high pressure.
- The fuel high pressure value is calculated from various variables such as lambda control and fuel quantity control.
Diagnostic conditions
- Battery positive voltage > 9 V
- Engine start recognized > 250 sec.
- Engine temperature - 10 °C ...+ 100 °C (50 °F ... 212 °F)
- Engine speed 450 ... 4,000 rpm
- Lambda control active
Possible fault causes
- Predelivery quantity or pressure in fuel low-pressure circuit too low
- Fuel high-pressure system leaking
- Fuel high-pressure sensor faulty
- Fuel high-pressure pump faulty
P12A1
Diagnosis information - DME (DFI)
Fuel high-pressure sensor implausible
NOTE:
- Faults in the fuel high- pressure injection area are often caused by defects in the predelivery circuit (fuel low-pressure).
Therefore, if there are problems in the fuel high-pressure injection area, the predelivery circuit must be checked first.
- Diagnosis detects a permanent deviation of the measured fuel high pressure from the calculated fuel high pressure.
- The fuel high pressure value is calculated from various variables such as lambda control and fuel quantity control.
Diagnostic conditions
- Battery positive voltage > 9 V
- Engine start recognized > 250 sec.
- Engine temperature - 10 °C ...+ 100 °C (50 °F ... 212 °F)
- Engine speed 450 ... 4,000 rpm
- Lambda control active
Possible fault causes
- Predelivery quantity or pressure in fuel low-pressure circuit too low
- Fuel high-pressure system leaking
- Fuel high-pressure sensor faulty
- Fuel high-pressure pump faulty