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 1 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-130
 
  
EVAP system, servicing EVAP system components
 
1 - 
Cap nut 
10 Nm
2 - 
Cover For EVAP canister
3 - 
Stud 15 Nm
4 - 
Sealing piece 
5 - 
Bleed line To EVAP canister purge regulator valve

Page 2 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-131
 
  
7 - 
Vacuum hose 
LDP / throttle actuator control module
  Connection in engine compartment4 cylinder engine   Fig.   16 cylinder engine   Fig.   2
8 - 
Cable tie 
To mounting of vacuum li

Page 3 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-132
 
  
11 - 
Connecting hose 
LDP / EVAP canisterPressure sideTo remove at LDP, press unlocking tab on 
connector 
12 - 
10 Nm 
13 - 
Air filter For LDP
14 - 
Sealing piece 
15 - 
Cable tie For m

Page 4 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-133
 
    
Vehicles with 1.8 ltr. turbo engine 
The vacuum line for the LDP -V144 is connected to the Throttle actuator 
control module line with a T-piece -arrow-.  Fig. 1  Connections to LDP in e

Page 5 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-134
      
EVAP system leak detection
 
     
Function of leak detection system  
      The leak detection system can recognize leaks in 
the entire fuel system, including the main fuel 
tank, the

Page 6 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-135
      
If; however, the reed contact closes within 10 
seconds, there is a leak. Then, the pump 
continues to cycle for four more strokes. The 
ECM measures the time for each of these four 
str

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 8 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual      
-  Remove connector flange cover under luggage 
compartment trim. 
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Page 9 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual 20-137
      
Note:  
     Observe the cover flange installation instructions. 
     
Front wheel drive   Page 20
-44
 
     
All wheel drive   Page 20
-97
 .
     
-  Visually inspect all fuel tank s

Page 10 of 65

AUDI A4 1999 B5 / 1.G EVAP Workshop Manual      Locate leaks at lines and components of the tank 
system by using a non-combustible, 
environmentally friendly, leak detector spray. 
Perform several leak diagnostics in a row to build 
up the sy
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