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HOMESERVICE MANUALSVOLKSWAGEN2016CC R-LINE EXECUTIVE, 2.0L ENG VIN NREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEFUEL DELIVERYFUEL SUPPLY20 FUEL SUPPLYDIAGNOSIS AND TESTINGFUEL SYSTEM, CHECKING FOR LEAKSPRESSURE RETENTION TEST
2016 Volkswagen CC R-Line Executive, 2.0L Eng VIN N

Pressure Retention Test

2016 Volkswagen CC R-Line Executive, 2.0L Eng VIN NSECTION Pressure Retention Test

-- Set the valve -D- to "Test". Increase the current pressure to 25 mbar (10 in. H2O).

Fig 1: Identifying Evaporative Emission (EVAP) Canister Purge Regulator Components
GWWN20-10395Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Watch the pressure gauge -C- and the flow meter -E-. If the flow quantity decreases and the pressure increases to 10 in. H2O (25 mbar), then the fuel system is full.

NOTE:

Depending on the level in the fuel tank, this procedure may take up to three minutes.

-- After the pressure has stabilized, set valve -D- to "Hold".

  • After five minutes the pressure must not drop below 8 in. H2O (20 mbar).

If the pressure is not maintained for five minutes, the leak should be localized as follows:

-- First, check the EVAP canister purge regulator valve 1 for leaks. To do this, clamp off the hose to EVAP canister purge regulator valve 1 using a Hose Clamps - Up To 25 mm 3094 -arrow-.

Fig 2: Clamping Off Hose To EVAP Canister Purge Regulator Valve 1 -N80- Using Hose Clamps Up To 25 Mm Dia. 3094
GWWN20-10641Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Set the valve -D- to "Test" and repeat the pressure test.

Fig 3: Identifying Evaporative Emission (EVAP) Canister Purge Regulator Components
GWWN20-10395Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Watch the pressure gauge -C- and the flow meter -E-. If the flow quantity decreases and pressure increases to 10 in. H2O (25 mbar), then the fuel system is full.

-- After the pressure has stabilized, set valve -D- to "Hold".

-- If the pressure stops falling, replace the EVAP canister purge regulator valve 1.

If the pressure continues to fall, perform the "fuel system leak test", refer to FUEL SYSTEM LEAK TEST .

After completing the work, perform the "Check tank ventilation system for leaks" guided function using the Vehicle Diagnostic Tester.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.