Checking the function of the flame sensor

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

• HINT: A transparent hose can be used to check if fuel supply to the parking heater works. 

  Ignition on.

  NOTE:

  It is important that only the ignition is on in order for the heater to start.

  • Activate the heater.

  Listen for a buzzing sound which indicates that the heater is running.

  Check the heater function.

  Other information 

  • See Engine coolant heater, test running
  Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Does the heater start? 

• YES 

  Refer to Checking components and wiring 

• NO 

  Refer to Checking components and wiring