AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual

AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual https://www.carmanualsonline.info/img/6/1070/w960_1070-0.png AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual

Page 1 of 7

AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual 24-128
 
  
Tank ventilation, checking Evaporative Emission (EVAP) canister 
purge regulator valve -N80-, checking
 
Special Tools and Equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
 VAS5051 w

Page 2 of 7

AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual 24-129
      
Note:  
     The Evaporative Emission (EVAP) canister purge 
regulator valve is also called the Tank Ventilation 
Valve (TVV) and is sometimes referred to as the 
EVAP valve. 
     
Chec

Page 3 of 7

AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual EVAP canister pur
ge re
gulator valve -N80
   Valve must click...
   ...and must open and close (can be tested by blowing into assisting 
hose). 
Pa
ge 3 of 7 Tank ventilation, checkin
g
11/23/2002 ht

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AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual 24-130
       If valve does not click:  
     
-  Check internal resistance of EVAP valve.
      If valve does not open and close properly:  
     
-  Replace Evaporative Emission (EVAP) canister 
pur

Page 5 of 7

AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual 24-131
      
Checking voltage supply  
     
Test requirements:  
     
Fuse for the EVAP valve OK. 
     
       Electrical Wiring Diagrams, Troubleshooting & 
Component Locations binder   
     
Fu

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AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual 24-132
       If LED does not light up:  
     
-  Check wire connection from terminal 1 to Fuel 
Pump (FP) relay via fuse for open circuit. 
     
       Electrical Wiring Diagrams, Troubleshooting &

Page 7 of 7

AUDI A4 1996 B5 / 1.G ATQ Engine Tank Ventilation Checking Workshop Manual 24-133
       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   Page 24
-17
 . 
    
If wire connection is