P2404

P2404

Diagnosis information - DME V8 DFI

Leakage diagnosis pump, Reed switch

Diagnostic conditions
- Short test Tank leak test
or:
- Vehicle voltage 9 V ... 16 V
- Ambient air pressure > 730 hPa (below approx. 2,400 ... 2,700 m above sea level)
- Engine temperature 5 °C ... 50 °C (41 °F ... 122 °F)
- Intake air temperature > 5 °C (41 °F)
- Fluctuations in the intake air temperature of less than 10 °C (18 °F)
- Time after engine start 5 seconds ... 20 minutes
- Steady speed with longer partial-load share for > 150 seconds
- Vehicle acceleration/deceleration -2 m/s2 ... + 2 m/s2
- Vehicle speed 7 ... 120 km/h (4 ... 75 mph)
- Height difference < 20 meters

Possible fault causes
- Vacuum system leaking
--> The system consists of the mechanical vacuum pump (on the vehicle engine), the leakage diagnosis pump, the intake pipe switchover valve and, where appropriate, the exhaust flaps in the rear muffler
- Vacuum pump faulty
- Tank vent valve stuck in closed position
- Purge-air line between tank vent valve and carbon canister blocked
- Short circuit to B+/ground or open circuit in signal line
- Leakage diagnosis pump faulty

Affected contacts on the DFI control unit connector
Connector [A]:
- Contact 35