2010 Porsche Panamera Turbo (970) V8-4.8L Turbo A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 550
Fault setting conditions
- Internally measured current is too high
Fault effects
- Solenoid valve 2 switch-off
- Transmission limp-home indication in instrument cluster control unit
P1021
P1021
Diagnosis information - Control unit DME (DFI)
Fuel high-pressure Quantity
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 predelivery circuit must be checked first.
Diagnostic conditions
- Engine speed 450 ... 4000 1/min
- Engine temperature -10 ... +100 锟斤拷C (锟斤拷F)
- Trip with different operating conditions
Possible fault causes
- Pre-delivery quantity or pressure in fuel low-pressure circuit too low
- Quantity control valve Faulty (in Fuel high-pressure pump)
- Fuel high-pressure pump Faulty
Fault setting condition(s)
- Deviation Actual value Quantity control (Fuel high-pressure)
P1023
P1023
Diagnosis information - Control unit DME (DFI)
Fuel pressure/quantity too low at start
INFORMATION
- This fault entry can be caused by diverse reasons.
- Fault finding is to be performed only if a customer complains about excessively long starting times.
- If there is no such customer complaint, the only measure to be taken is to clear the fault memory.
Diagnostic conditions
- Engine start
- Engine temperature -10 ... +100 锟斤拷C (锟斤拷F)
- Engine running > 5 Second(s)
Possible fault causes
- Pre-delivery quantity or pressure in fuel low-pressure circuit too low (See [Information 1])
- Quantity control valve Faulty (in Fuel high-pressure pump)
- Fuel high-pressure pump Faulty
Fault setting condition(s)
- low-pressure start enabled (See [Information 2])
INFORMATION
1. - 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 predelivery circuit must be checked first.
2. - Starting in the low-pressure range is enabled if the required fuel pressure for a high high-pressure start was not reached or was not reached
quickly enough.
- Starting takes considerably longer (up to 2 sec.) as a result.
P1024
P1024
Diagnosis information - Control unit DME (DFI)
Fuel high-pressure after engine off too high
