Checking components

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Check that the air flow through the hoses from the upper rear connection on the leak diagnostic pump to the intake manifold connection (1) is unimpeded. Check that there is no leakage between the connections
  NOTE:

  Air can only flow from the leak diagnostic pump to the intake manifold.

• Check the function of the non-return valve (4). See the arrow on the non-return valve
• Remedy as necessary.
  Fig 2: Identifying Non-Return Valve (4)

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Replacing the component