P2401

P2401

Diagnosis information - DME V6 DFI

Pump driver DLDP

NOTE:
If the connector B is disconnected from the DFI control unit and the ignition is switched on or was switched on, the fault >>DFI control unit TIMEOUT<< is entered in many control units.

NOTE:
If the control unit connector B is disconnected from the DFI during fault finding or if the power supply is interrupted elsewhere (battery, fuse), teaching of the throttle valve adjusting unit must be performed.

Diagnostic conditions
- Battery positive voltage between 9 V and 16 V
- Time after engine starts > 10 seconds

Possible fault causes
- Vacuum system leaking
--> The system consists of the mechanical vacuum pump (on the vehicle engine), the brake booster, etc., the leakage diagnosis pump, the intake pipe switch-over valve and, where appropriate, the exhaust flaps in the rear muffler
- Vacuum pump faulty
- Short circuit to ground in control line
- Leakage diagnosis pump faulty (short circuit)

Affected contacts on the DFI control unit connector
Connector [B]:
- Contact 8

Affected contacts on the leakage diagnosis pump connector
Connector [A]:
- Contact 2