2010 Porsche Panamera Turbo (970) V8-4.8L Turbo A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 434
P0444
P0444
Diagnosis information - Control unit DME (DFI)
Final stage Tank vent
Diagnostic conditions
- Short test Tank vent perform
or:
- Period since engine was started > 10 Second(s)
- Tank vent activated
Possible fault causes
- Loose contact or corrosion on connectors or lines
- Short circuit to B+ or open circuit in lines (Power supply or Activation Tank vent)
- Tank vent Faulty
P0455
P0455
Diagnosis information - Control unit DME (DFI)
Tank system - Leak
Diagnostic conditions
- Short test Tank tightness perform
or:
- Driving > 150 Second(s), at:
- Engine start temperature 5 ... 50 锟斤拷C (锟斤拷F)
- Period since engine was started 5 Second(s) ... 20 Minute(s)
- Ambient pressure > 730 hPa (= Location below approx. 2400 ... 2700 m)
- Height difference < 20 m
- Intake air temperature > 5 锟斤拷C (锟斤拷F)
- Intake air temperature: fluctuation(s) < 10 锟斤拷C (锟斤拷F)
- Vehicle speed 7 ... 120 km/h
- Acceleration / Deceleration max. -2 m/s?... +2 m/s? - high component Partial load
Possible fault causes
- Tank cap loose / does not close (sufficiently)
- Tank cap leaks / Faulty
- Vacuum system leaks (See [Information 1])
- Vacuum pump Faulty
- Tank vent (tank vent valve) mechanical Faulty (does not close sufficiently))
- Leakage diagnosis pump internal (Diaphragm) or external leak
- Tank system (with hoses) leaks
Fault setting condition(s)
- Leaks total in the Tank system (See [Information 2]):
- Diameter approx. 0.5 - 1 mm - Ultra-fine leak P0456
- Diameter approx. 1 - 2 mm - Fine leak P0442
- Diameter > 2 mm Coarse leak P0455
INFORMATION
1. The system includes:
- mechanical Vacuum pump
- Leakage diagnosis pump
- Intake pipe switchover (not Turbo)
- Frequency valve, boost control (only Turbo)
- Diverter solenoid valve (only Turbo)
- Exhaust flap (if present)
2. There may be several small leaks which correspond in total to the leak determined here.
