A - Check Fuel Delivery Rate

WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2017 Audi S5, 2017 Audi A5 Quattro, 2016 Audi S5, 2016 Audi A5 Quattro, and 2015 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Cover Bolts For Locking Flange

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-- Follow all test requirements. Refer to TEST CONDITIONS .

-- Remove the rear bench seat. Refer to BENCH SEAT/SINGLE SEAT, REMOVING AND INSTALLING .

-- Remove the locking flange cover -arrows-.

-- Disconnect the connector -1- on the sealing flange.

Fig 2: Disconnect Connectors

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NOTE:

Ignore item -2-.

-- Push the circlip -1- upward -arrow A- and squeeze the release -arrow B-.

Fig 3: Pulling Lock -1- Upward -Arrow A- & Press -Arrow B-

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-- Connect the Injection Rate Comparison Meter Kit - Remote Cable:VAG1348/3A using the remote cable :VAG1348/3-3 and cable from the Connector Test Set:VAG1594D to the terminal -1-.

Fig 4: Checking Fuel Pressure

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-- Tape the second Injection Rate Kit - Remote Cable :VAG1348/3-3 with insulating tape -arrow-.

-- Connect the connector terminal -5- to the body ground with an adapter cable from the Connector Test Set:VAG1594D .

-- Place the switch for the Injection Rate Comparison Meter Kit - Remote Cable:VAG1348/3A toward front in engine compartment.

-- Remove The Center Plenum Chamber Cover. Refer to PLENUM CHAMBER COVER, REMOVING AND INSTALLING .

Fig 5: Identifying Cover, Removal

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-- Releases the retainer -arrow A- and open the cover -arrow B-.

Fig 6: Opening Terminal Box Cover

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-- Connect the alligator clip to the Battery Jump Start Terminal -U6- -A- in the Terminal 30 Wire Junction 2 -TV22- in the plenum chamber.

Fig 7: Checking Fuel Pressure

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-- Release and open the fuel filler door.

Fig 8: Identifying Cap -2-

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-- Remove the cap -2- for the fuel filler -1-.

NOTE:

Ignore item -3-.

WARNING:

There is a risk of injury because the fuel is under high pressure.

To reduce pressure in fuel system, lay a clean cloth around the connector and carefully loosen connector.

Vehicles with 4-Cylinder Engines

Fig 9: Identifying Fuel Line

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-- Disconnect the fuel line -2-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Vehicles with 6-Cylinder FSI and TFSI Engines

Fig 10: Locating Fuel Line -1-

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-- Loosen the clamp and remove the fuel line -1-.

-- Connect the Pressure Tester Kit - Hose 1:VAS6550/1 and adapter hose -1- to the fuel supply line and secure them with hose clamps -2-.

Fig 11: Connecting Fuel Supply Line To Test Kit Adapter Hose

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S5 with 8-Cylinder Engine

Fig 12: Identifying Engine Cover

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-- Remove the engine cover -arrows-.

-- Disconnect the fuel line -arrow-.

Fig 13: Disconnecting Fuel Line

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-- Connect the Fuel Injection Gauge Kit - Adapter Set:VAG1318/17A using the Fuel Injection Gauge Ki - Adapter 12:VAG1318/12 to the fuel line -1-.

Fig 14: Connecting Fuel Injection Gauge Kit - Adapter Set VAG1318/17A

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RS5

Fig 15: Engine Cover (4.2L Engine)

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-- Remove the engine cover -arrows-.

-- Fold the boot -1- downward and disconnect the hose coupling -2-. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 16: Pushing Hose Coupling -2- Downward -Arrow A-, Then Press Release Buttons -Arrow B-

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Continuation for All Vehicles

Fig 17: Identifying Diesel Pressure Tester Kit VAS 6550 With Diesel Pressure Tester Kit - Hose 2 VAS 6550/2

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-- Connect the Diesel Pressure Tester Kit:VAS6550 with the Diesel Pressure Tester Kit - Hose 2:VAS6550/2 to the fuel supply line.

-- Connect the Pressure Regulator Valve:VAS6550/4 and hold the hose in a fuel-resistant measuring container.

NOTE:

The illustration shows the measuring setup for a 4-cylinder engine.

-- Turn the Pressure Tester Kit:VAS6550 -1- on by pressing the On/Off button.

Fig 18: Identifying Shut-Off Valves A And B On Pressure Tester Kit

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-- Open the shut-off valves -A and B-.

The levers point in the direction of flow.

CAUTION:

Risk of fuel leak.

The shut-off valve -C- must be closed.
The lever is perpendicular to the direction of flow.

NOTE:

In order to measure the fuel delivery rate, there must be an initial pressure inside the fuel line against which the fuel pump must work during the measuring. Adjust the initial pressure using the Pressure Tester Kit:VAS6550 as follows:

-- Push the remote control switch: the fuel pump starts running.

-- Turn the adjusting screw -1- on the Pressure Regulator Valve:VAS6550/4 to create an initial pressure in the fuel system until the correct initial pressure value is reached.

Fig 19: Identifying Pressure Regulator Valve Adjusting Screw

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Specified value: 4 bar (58 psi) pressure.

-- Release the remote control switch.

-- Do not turn the adjusting screw -1- any farther.

-- Empty measuring container.

-- Press the remote control switch for 15 seconds.

Fig 20: Compare Quantity Of Fuel Delivered With Minimum Delivery Rate In Diagram

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-- Compare quantity of fuel delivered with minimum delivery rate in diagram (cm³ /15 s).

NOTE:

Voltage at fuel pump with engine stopped and pump running is approximate. 2 volts less than battery voltage.

If the Minimum Delivery Rate Is Attained

The fuel delivery unit with the fuel filter, fuel pressure regulator and fuel supply line are OK.

If Minimum Delivery Quantity Is Not Obtained, the Following Malfunctions May Be Present

Fuel delivery unit faulty.
The fuel filter is clogged.
The fuel pressure regulator is faulty.
Fuel supply line is pinched.

NOTE:

To locate the fault in more detail, perform the "pressure test in the fuel supply line", described as follows.