Checking the turbocharger (TC) control system

• Release the boost pressure control (BPC) valve according to Checking and adjusting the boost pressure control (BPC) valve on the turbocharger (TC) . Check that the boost pressure control (BPC) valve is unimpeded and does not stick in the closed position
• Check the turbocharger (TC) according to Checking boost pressure with manometer while test driving the car . In particular check the hoses and the function of the pressure regulator
• Remedy as necessary.

Fig 1: Identifying Mass Air Flow (MAF) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking the connectors and components