Checking the connectors

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Connecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Check the electrical terminals on the combustion fan and the control module connector. Check for contact resistance and oxidation and remedy.
Check for damage carefully
Reinstall the components, reconnect the connectors etc.
Ignition on
Activate the combustion fan.
Listen for a buzzing sound which indicates that the combustion fan is running.

If the combustion fan now operates, the cause of the fault was loose connections in the connectors.

Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box
- To access the combustion fan:
  - For cars manufactured up to w38 2001 inclusive, see Fuel injection nozzle / fan motor / pressure equalizer, replacing
  - For cars manufactured from w39 2001 inclusive, see Fuel injection nozzle / fan motor / pressure equalizer, replacing .
- See Checking wiring and terminals .
Fig 3: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS OF NORTH AMERICA.

Does the combustion fan function?