AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual A8 2000 D2 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1043/w960_1043-0.png AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual

Page 1 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 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

Page 2 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual      
Wiring diagrams 
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Page 3 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-155
      
Intake Manifold Tuning (IMT) function, 
checking
 
     
Note:  
     The following test should only be conducted if 
performance deficiencies occur. 
     
-  Increase engine rpm clearl

Page 4 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-156
      
Intake Manifold Tuning (IMT) valve, 
checking
 
     
Notes:  
     
Without current the tuning -N156- is closed.
     Component locations   page 24
-1 
     
Checking flow and for leaks

Page 5 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-157
      
Electrical check of intake manifold tuning 
valve -N156-  
     
-  Disconnect harness connector from intake 
manifold tuning valve. 
    
If the specified value is not attained:  
  -

Page 6 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-158
      
Checking voltage supply for intake manifold 
tuning valve -N156-  
     
Test requirements 
     
Fuse for for intake manifold tuning valve OK 
    
-  Disconnect harness connector from

Page 7 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-159
      
-  Check wiring from terminal 1 of 2-pin connector 
to fuse per wiring diagram for continuity. 
     
   Specified value: max. 1 Ohm
      If wiring is OK:  
     
-  Check fuel pump rel

Page 8 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-160
      
Checking signal for intake manifold tuning 
valve -N156-  
    
If LED does not flash or stays on continuously:  
If LED does not flash:  -  Connect LED test lamp VAG1527 with wires from

Page 9 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 24-161
       If LED stays on continuously:  
    
If wiring is OK:  -  Check wiring from terminal 2 of 2-pin connector to terminal 64 of test 
box for ground per wiring diagram. 
-  Replace Motronic

Page 10 of 11

AUDI A8 2000 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual 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 m
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