Checking the fuel tank pressure sensor

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Open the fuel tank filler cap.
• Start the engine and let it idle.

  Read off the fuel tank pressure.

  HINT: The fuel tank pressure must be higher than -10 hPa. The normal value is close to 0 hPa. If uncertain of the function of the fuel tank pressure sensor, try connecting another fuel tank pressure sensor. 

  Remedy as necessary.

  Fig 2: Identifying VCT2000 Diagnostic Tool

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the fuel tank pressure OK? 

• YES 

  Refer to Checking the canister purge (CP) valve 

• NO 

  Refer to Verification information