Test Procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

-- Remove the engine cover with air filter. Refer to the Repair Information.

Checking resistance

-- Disconnect the Fuel Pressure Regulator Valve -N276- electrical harness connector -2- from the Fuel High Pressure Pump -- -1-.

Fig 1: Locating Fuel High Pressure Pump & Fuel Pressure Regulator Valve Electrical Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Using a multimeter, check the Fuel Pressure Regulator Valve -N276- terminals 1 to 2 for resistance.

Specified value: 1.8 Ω (+/- 2.0 Ω at approx. 20° C)

If the specified value was Not obtained:

-- Replace the Fuel Pressure Regulator Valve -N276-. Refer to the Repair Information.

If the specified value was obtained:

Checking voltage

Switch the ignition On.

-- Using a multimeter, check the Fuel Pressure Regulator Valve -N276- electrical connector terminal 1 to Ground for voltage.

Specified value: Battery voltage.

Switch the ignition Off.

If the specified value was Not obtained:

-- Check the wiring from the Fuel Pressure Regulator Valve -N276- electrical connector terminal 1 to the Engine Component Power Supply Relay -J757- terminal 5 for a short circuit to Ground, high resistance or an open circuit.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the wiring connection.

-- If a short was found, replace fuse if blown.

If the specified value was obtained: