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 MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONVARIABLE INDUCTION SYSTEMVARIABLE INDUCTION CONTROL VALVETESTING AND INSPECTIONINTAKE MANIFOLD TUNING (IMT) VALVE FUNCTION, CHECKING
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Intake Manifold Tuning (IMT) Valve Function, Checking
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Intake Manifold Tuning (IMT) Valve Function, Checking
Intake Manifold Tuning (IMT) Valve Function, 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). Refer "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1551 or VAG1552 Scan Tool" Testing and Inspection
Indicated on display
Rapid data transfer HELP
Select 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-, -2- and -2- to input display group number 22 (022), and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block 22 ->
1 2 3 4
- Check specified values for IMT valve function (display fields 1 and 4):
- Check display field 4.
Specified value: "SU-V OFF"
- Raise engine speed to approx. 4200 RPM and hold (display field 1) and check operating condition in display field 4.
- Specified value: "SU-V ON"
- At the same time, the valve must cycle (change over) one time.
If "SU-V ON" is displayed but the change-over does not occur:
- Check pneumatic function of IMT valve. Intake Manifold Tuning (IMT) Valve Pneumatic Function, Checking
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.