AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owner's Manual

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owner's Manual A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1094/w960_1094-0.png AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owner's Manual
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Page 21 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual -  Replace Heated Oxygen Sensor (HO2S)-G39-.
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Page 22 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-91
       If specified value is obtained:  
     
-  Check voltage supply of oxygen sensor 
heating. 
     
Checking voltage supply for oxygen sensor 
heating  
    
Note:  
When the Engine Control

Page 23 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-92
      
-  Operate starter briefly. 
     
 
Specification: approx. battery voltage
      If there is no voltage again:  
     
-  Check wire connection from terminal 3 of 
connector to Fuel Pump

Page 24 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual When the Engine Control Module (ECM) switches oxygen sensor heating 
on and off, it may be observed via the function "read measuring value 
block", in display group number 041 display field 2. 
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Page 25 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-93
      
-  Switch ignition off.
      If there is no voltage:  
     
-  Connect VAG1598/31 test box at wiring harness 
to Engine Control Module (ECM), do not connect 
ECM  Page 24
-19
 .

Page 26 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-94
      
Heated Oxygen Sensor (HO2S) and 
oxygen sensor control after Three Way 
Catalytic Converter (TWC), checking
 
     
Note:  
     The oxygen sensor before catalytic converter 
(bank 1, sen

Page 27 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-95
 
  
Special Tools and Equipment  
 
VAG1526A
 VAG1594A
 VAG1598/31
 VAG1788/10 RPM adjuster
 VAS5051 with VAG5051/1
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Page 28 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-96
      
Test requirements:  
     
Exhaust system free of leaks. 
     Coolant Temperature at least 80  C. 
     
Test sequence  
     
- Connect VAS5051 tester   Page 01
-7 and 
select vehicle s

Page 29 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-97
 
    
Display on VAS5051:  
1 - Enter display group Max. input value = 255
-  Select function "030" in button field -2- for "display group number 030" 
and press Q button to confirm input.

Page 30 of 46

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Owners Manual 24-98
 
  
Display fields  
  
1   2   3   4  
Display group 030: Oxygen sensor status  
Display   X X X  
X X X  
    
Indicated   Oxygen sensor status, bank 1, sensor 1  
Oxygen sensor status bank 2
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Trending: check engine, wiring, catalytic converter, coolant reservoir, lock, fuel pump, display