AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owner's Guide

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owner's Guide A4 1999 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1045/w960_1045-0.png AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owner's Guide

Page 31 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-24
      
-  Check learning values for Oxygen Sensor (O2S) 
control before TWC (display fields 1-4): 
  
Display fields  
  
1  2  3  4  
Display group 32: Oxygen Sensor (O2S) control learning valu

Page 32 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide Read Measuring Value Block 33 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
Pa
ge 32 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1

Page 33 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-25
      
-  Check Oxygen Sensor (O2S) control before 
TWC (display fields 1-4): 
  
Display fields  
  
1  2  3  4  
Display group 33: Oxygen Sensor (O2S) control (before TWC)  
Display   xx.x %

Page 34 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-26
      
Continuation  
      If the value in either display field 1 or 3 is NOT 
OK, or if the value does not fluctuate by at least 2 
%:  
     
-  Road test to condition oxygen sensor(s) 
(elim

Page 35 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide -  Switch ignition off.
Pa
ge 35 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.

Page 36 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-27
 Evaluation of display group 32  Display group: 
32  
  
  
Display fields: 
1-4  
Possible malfunction cause  
Corrective action  
O2S control 
learning value:  
-25.0 to -10.0 
%   
Engine oil

Page 37 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide   
 
Fuel injector does not open, or partially opens- Check fuel injectors   page 24
-102
O2S control 
learning value:  
constant 0.0 %   
Oxygen sensor control learning not active- Check Mass Air Flo

Page 38 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-28
 Evaluation of display group 33  Display group: 
33  
  
  
Display fields: 
2, 4  
Possible malfunction cause  
Corrective action  
approx. 0.435 V  
 
Open circuit in wiring between HO2S conne

Page 39 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-29
      
Checking HO2S reference voltage (Banks 1, 
2)  
     
-  Disconnect 4-pin connector for respective 
HO2S. 
    
If voltage is NOT OK:  
If voltage is OK:  -  Connect multimeter US1119 (Fl

Page 40 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owners Guide 24-30
      
Checking HO2S wiring, bank 1, sensor 1  
     
-  Disconnect 4-pin connector (black) for HO2S -
G39-. 
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 .