A4 V6-3.0L (AVK) (2004)
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Wait until pressure has dropped, 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.
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: Pressure gauge displays the pressure behind the stopcock "intake manifold side" after the stopcock is closed (in direction of fuel injector, fuel
pressure regulator). If the pressure drops in front of the stopcock (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 stopcock are not properly sealed.
NOTE: Close stopcock for removing the pressure gauge, loosen threaded connection at VAG1318/7 adapter and let excess fuel escape into catch
reservoir by opening stopcock.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1
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Check DTC memory, "Mode 3: Check DTC memory". See: Powertrain Management/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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If necessary, erase DTC memory, "Mode 4: Reset/erase diagnostic data". See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Diagnostic Mode 4: Check
Reset/Erase Diagnostic Data
3
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Generate readiness code. See: Powertrain Management/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.
