24-154
Intake Manifold Tuning (IMT)
system
Notes:
The change-over of the manifold from long to
short intake path occurs at approx. 4500 RPM.
Component location page 24
-1
Required special tools and test equipment
VAG1551 or VAG1552 Scan Tool (ST) with
VAG1551/3 adapter cable
VAG1598/22 test box
Multimeter US1119 (Fluke 83 or equivalent)
VW1594 connector test kit
VAG1348/3A remote control connection
VAG1348/3-2 adapter cable
VAG1390 hand pump
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24-162
Vacuum system, checking for leaks
- Let engine run 2 to 3 minutes at idle (for vacuum
to build up).
- Switch ignition off.
- Remove 2-pin connector from intake manifold
tuning valve -N156- (change-over valve).
- Connect jumper wire (from VAG1594) from one terminal of -N156- to
engine ground.
- Use VAG1248/3A remote, adapter wire VAG1348/3-2 and auxiliary
wire to connect second terminal of -N156- to B+.
- Activate intake manifold tuning valve -N156-, using remote control
VAG1348/3A, for approx. 2 to 3 min.
The vacuum solenoid must remain actuated during this time.
Pa
ge 10 of 11 Intake Manifold Tunin
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pair&id=AUDI.B5.FU03.24.3
