C - Entire System Pressure Test
WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
- Fuel delivery rate and pressure test in the fuel supply is OK.
- The :VAS6551/5-2 must be connected to the fuel supply line and the :VAS6551 .
- Vehicle Diagnostic Tester is connected.
-- Connect the :VAS6551/5-1 to the fuel supply hose -1- to the high pressure pump, secure it with a hose clamp and install the :VAS6551/2 .
-- Connect the :VAS6551/2 to the :VAS6551 .
NOTE:
The :VAS6551 is inserted in the fuel supply line.
-- Switch on the :VAS6551 -1- by pressing the On/Off button.
-- 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.
-- Turn on the ignition and select the following menu items on the Vehicle Diagnostic Tester:
- OBD
- Engine Electronics
- Basic Setting
- Transfer Fuel Pump Test
-- Press Start : The fuel pump starts.
-- Read the fuel pressure in the :VAS6551 .
- Specified value: 3.8 to 5 bar (55 to 84.1 psi)
If Specified Value Is Not Reached, Although the Fuel Delivery Rate Was OK:
- The high pressure pump overflow valve is not OK
If the Specified Value Is Exceeded By More Than 6 bar (87 psi)
- The fuel return line is blocked or kinked.