check engine AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual TT 1999 8N / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/952/w960_952-0.png AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual

Page 1 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-46
 
     
Charge air system with 
turbocharger (engine code 
ATW) 
     
Checking mechanical recirculation valve  
     
Notes:  
     
The mechanical recirculation valve is located in 
front of t

Page 7 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-51
       If the specified value is attained:  
     
-  Check voltage supply
     
Checking voltage supply  
     
Note:  
     Voltage is supplied to the recirculation valve via 
the Fuel Pump (F

Page 10 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-53
       If LED does not blink or if it remains constantly 
lit:  
     
-  Connect VAG1598/31 test box at wiring harness 
to ECM, do not connect ECM: 
     
       Repair Manual, 1.8 Liter 4-Cyl.

Page 16 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-58
      
Note:  
     The height of the charge air pressure should be 
determined using the VAG1397/A turbocharger 
test tool, the VAS5051 tester or the VAG1551 
Scan Tool is used to determine whe

Page 19 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-61
      
Note:  
     The wastegate bypass regulator valve -N75- and 
wire connections are monitored by the Engine 
Control Module (ECM). 
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and

Page 22 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-63
       If specified value is not obtained:  
     
-  Replace wastegate bypass regulator valve -N75-
. 
      If the specified value is met:  
     
Checking voltage supply  
    
If LED does no

Page 24 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-65
 
    
If wire connection is OK:  
 Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel Injection & Ignition, 
Repair Group 24    -  Check the following wire connection for open circuit and short circ

Page 26 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-67
      
Note:  
     The charge air pressure sensor -G31- and wire 
connections are monitored by the Engine Control 
Module (ECM). 
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and selec

Page 28 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-68
      
-  Switch ignition on.
     
 
Specified value: approx. 5 V
      If specified value is not obtained:  
    
 Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel Injection & Ignition, 
Repair G

Page 29 of 42

AUDI TT 1999 8N / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual 21-69
      
Checking signal wire  
     
-  Connect harness connector at charge air 
pressure sensor. 
     
-  Connect multimeter to socket 101 and socket 
108 of test box for voltage measurement.