Ignition AUDI A4 1999 B5 / 1.G EVAP Workshop Manual

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual A4 1999 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1100/w960_1100-0.png AUDI A4 1999 B5 / 1.G EVAP Workshop Manual

Page 7 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-136
      
Fuel tank and EVAP system, checking 
for leaks
 
     
Note:  
     In the following, individual questionable points 
will be considered that could be leaks in the fuel 
tank and tank ve

Page 11 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-138
      
-  Visually inspect the fuel supply system 
components: 
     
 
Fuel tank 
     
 EVAP canister
     
 LDP
     
 EVAP canister purge regulator valve -N80
     
Note:  
     At times, t

Page 16 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-141
 
    
Note:  
In the following description the performance of the On Board Diagnostic 
(OBD) procedure the VAG1551 Scan Tool (ST) is used. When using 
Vehicle Diagnostics Test and Information

Page 21 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-146
      
Checking LDP via output DTM (vehicles with 
electronic throttle control)  
    
Note:  
In the following description the performance of the On Board Diagnostic 
(OBD) procedure the VAG15

Page 23 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-148
       If LDP -V144 is not activated (pump is silent):  
     
-  Switch ignition off.
     
-  Remove LDP (   Page 20
-162
 ) and disconnect 
electrical connector. 
Pa
ge 23 of 65 EVAP s
ystem

Page 27 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-152
       If LED does not light up:  
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   
If wiring is OK:  
 Repair Manual, Fuel Injection & Ignition, Repair Group 24    -

Page 28 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-153
      
Checking output wiring (vehicles with 
mechanical throttle activator)  
    
-  Remove weatherstrip at plenum chamber -arrows-.
-  Remove cover for plenum chamber -1- toward front.
-  Re

Page 30 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-155
       If you did not find any malfunction, however the 
Leak Detection Pump (LDP) did not function 
during the output Diagnostic Test Mode (DTM):  
     
-  Replace Leak Detection Pump (LDP) -

Page 31 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-156
      
Checking output wiring (vehicles with 
electronic throttle control)  
    
-  Connect voltage tester VAG1527B as follows:Electrical connector terminal  
Specification  
2   Battery Posit

Page 32 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-157
 
    
-  Remove weatherstrip at plenum chamber -arrows-.
-  Remove cover for plenum chamber -1- toward front.
-  Remove cover for E-box in plenum chamber.
    
Note:  
Disconnect or connect th
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