AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 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 Workshop Manual

Page 101 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-78
      
Continuation 
     
-  Start engine and let run at idle.
     
Temperature value must increase evenly 
      If NOT:  
     
- 
Press  button. 
     
-  Press buttons -0- and -6- to selec

Page 102 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual intermittently interrupted and the sensor must 
be replaced. 
Pa
ge 102 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

Page 103 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-79
 Evaluation of display group 4  Display group: 4  
  
  
Display field: 3  
Possible malfunction cause  
Corrective action  
approx. -46.5 C  
 Open circuit or short circuit in wiring to B+ - Ch

Page 104 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-80
 
    
-  Check wiring for short circuit between ECM/test box and 4-pin harness 
connector according to wiring diagram. 
 
Connector terminal 1 to vehicle Ground
 Connector terminal 1 to ECM/tes

Page 105 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-81
       If wiring is OK:  
    
-  Check ECT sensor resistance across terminal 1 (signal) and terminal 3 
(ground). 
-  Check measured resistance value for appropriate temperature range 
using gr

Page 106 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-82
      
Intake Air Temperature (IAT) sensor, 
checking
 
     
Required special tools and test equipment  
     
VAG1551 or VAG1552 Scan Tool (ST) with 
VAG1551/3 adapter cable 
     VAG1598/22 t

Page 107 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-83
      
Checking  
     
-  Connect VAG1551 or VAG1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with ignition 
switched on)   page 01
-8 . 
Rapid

Page 108 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-84
      
-  Compare displayed value with specified value 
for intake air temperature (display field 4): 
  
Display fields  
  
1   2   3   4  
Display group 4: General engine data  
Display   xxx

Page 109 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-85
 Evaluation of display group 4  Display group: 4  
  
  
Display field: 4  
Possible malfunction cause  
Corrective action  
constant 25.5 C  
Open or short circuit in wiring to B+- Check wiring

Page 110 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual  
Specified value: max. 1.5 
Pa
ge 110 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=AU