A8 Sedan V8-3.7L (AEW) (1997)
Intake Manifold Change-Over Valve: Testing and Inspection
Intake Manifold Tuning (IMT) Valve Function, Checking
Intake Manifold Tuning (IMT) Valve Function, Checking
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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" See: Computers and
Control Systems/Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
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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
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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
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Check specified values for IMT valve function (display fields 1 and 4):
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Check display field 4.
Specified value: "SU-V OFF"
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Raise engine speed to approx. 4200 RPM and hold (display field 1) and check operating condition in display field 4.
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Specified value: "SU-V ON"
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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:
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Check pneumatic function of IMT valve. See: Intake Manifold Tuning (IMT) Valve Pneumatic Function, Checking