Engine Mount Control DDE 4.0

The controllable engine mounts are switched to "hard" or "soft" corresponding to operating conditions.

Function

The pressure converter connects the engine mounts to the vacuum supply by means of hoses. When activated by the DDE control unit, the pressure converter switches vacuum through to the engine mounts so that they switch to "soft".

The engine mounts are activated at:

• Road speed < 60 km/h and
  
• Engine speeds < a value which depends on the coolant temperature as follows:
  Below -40 °C: 1200 rpm
  From -40 °C to -10 °C: 1200 rpm to 1050 rpm
  Above -10 °C: 1050
  

Troubleshooting

Fault code 3520 "Engine mount control" is stored if a defect occurs in the activation of the pressure converter.

The engine mount control is switched off if one of the following faults occurs:

• 0500, "Driving speed signal"
  
• 0115, "Coolant temperature sensor"