Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSAIR CONTROL VALVE FOR FUEL INJECTORS, CHECKING
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Air Control Valve For Fuel Injectors, Checking
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Air Control Valve For Fuel Injectors, Checking
Air Control Valve For Fuel Injectors, Checking
Function, checking
Test requirement
- Engine coolant temperature at least 85 °C (185 °F)
Checking
- Connect VAG1551 or VAG1552 Scan Tool (ST), and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (engine running at idle). [1][2]Scan Tool Connecting and Initial Checks
Indicated on display
Rapid data transfer HELP
Selecting function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Press buttons -0-, -3- and -5- to input display group number 35 (035), and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block 35 ->
1 2 3 4
- Check specified values for air control valve for fuel injectors (air-shrouded fuel injectors), display field 4:
Specified value in display field 4: A-IV OK
If display is not as specified:
- Press -4- button on VAG1551 scan tool to select "Basic Setting" function 04.
- Check specified values for air control valve for fuel injectors (air-shrouded fuel injectors), display fields 2 and 4:
If display is not as specified:
- Check air lines for blockage.
- Check air control valve for fuel injectors. Refer to "Air Control Valve For Fuel Injectors, Electrical Testing" Testing and Inspection
- Press -> button to advance program sequence.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.