A6 V6-3.0L (AVK) (2004)
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Wait until pressure has risen, and then switch off ignition.
Simultaneously close shut-off valve of VAG1318 pressure gauge (lever perpendicular to direction of flow -arrow-).
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Observe pressure drop on pressure gauge.
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Switch ignition off.
The following malfunctions are possible if the pressure does not drop:
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There is a leak in the threaded connection between the pressure gauge and the fuel supply line
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There is a leak at the supply line at fuel tank.
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There is a leak in the check valve in the Fuel Pump (FP).
NOTE: After the shut-off valve is closed, pressure gauge displays the pressure behind the shut-off valve "intake manifold side" (in direction of fuel
injectors, fuel pressure regulator). If the pressure drops in front of the shut-off valve (in direction of fuel tank), the device cannot detect it.
The following malfunctions are possible if the pressure drops again:
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Fuel pressure regulator faulty
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Fuel injectors not properly sealed
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Threaded connections of pressure gauge behind shut-off valve are not properly sealed.
NOTE: To remove pressure gauge, close shut-off valve, loosen threaded connection at VAG1318/7 adapter and let excess fuel escape into catch
reservoir by opening shut-off valve.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1
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Check DTC memory, Diagnostic mode 3 - Check DTC memory. See: Computers and Control Systems/Testing and Inspection/Scan Tool
Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Diagnostic Mode 3: Check DTC Memory
2
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Erase DTC memory, diagnostic mode 4 - Reset/erase diagnostic data. See: Computers and Control Systems/Testing and Inspection/Scan Tool
Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
3
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness
Codes/Audi Drive Cycle/Readiness Code/With Generic Scan Tool/Readiness Code, Generating
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End diagnosis and switch ignition off.