AUDI A8 1997 D2 / 1.G ATQ Engine Motronic On Board Diagnostic Workshop Manual
  A8 1997 D2 / 1.G
  AUDI
  AUDI
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  AUDI A8 1997 D2 / 1.G ATQ Engine Motronic On Board Diagnostic Workshop Manual
            
        
  
 
Page 2 of 19
01-2
      
If the ECM recognizes malfunctions that lead to 
a degradation of emissions values, it indicates 
them by lighting the Malfunction Indicator Lamp 
(exhaust warning lamp -K83-). Clarification of 
this lamp   Page 01
-3 . 
     
"E-Gas"-relevant malfunctions are also 
indicated in the instrument cluster by the 
warning lamp for Electronic Power Control 
("EPC warning lamp"). 
Pa
ge 2 of 19 Motronic, On Board Dia
gnostic 
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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e=re
pair&id=AUDI.B5.FU05.01.1 
        
        
        Page 5 of 19
01-5
      
Function test of warning lamp  
     
-  Switch ignition on.
     
 
Warning lamp for On Board Diagnostic 
(Malfunction Indicator Lamp -MIL-) must 
light up 
     
A - Warning lamp for On Board Diagnostic 
(Malfunction Indicator Lamp -MIL-) does not 
light up  
     
-  Connect VAG1598/31 test box at wiring harness 
to ECM, do not connect ECM   Page 24
-17
 . 
     
-  Bridge sockets 1 and 47 of test box.
     
-  Switch ignition on.
     
 
Warning lamp must light up.
      If warning lamp does not light up:  
     
-  Switch ignition off.
     
- Remove instrument cluster:
     
Pa
ge 5 of 19 Motronic, On Board Dia
gnostic 
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1 
        
        
        Page 6 of 19
       Repair Manual, Electrical Equipment, Repair 
Group 90, Instrument cluster, removing and installing
   
Pa
ge 6 of 19 Motronic, On Board Dia
gnostic 
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)
11/23/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1 
        
        
        Page 7 of 19
01-6
      
-  Check the following wire connection for open 
circuit and short circuit to B+: 
     
Test box  
VAG1598/31  
Socket  
Instrument cluster  
  
Terminal  
47    Electrical Wiring Diagrams, 
Troubleshooting & Component 
Locations binder   
     
-  Repair open circuit or short circuit if 
necessary. 
      If wire connection is OK:  
     
-  Replace Engine Control Module (ECM)   Page 
24
-21
 . 
Pa
ge 7 of 19 Motronic, On Board Dia
gnostic 
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1 
        
        
        Page 8 of 19
01-7
      
B - Warning lamp for On Board Diagnostic 
(Malfunction Indicator Lamp -MIL-) remains lit 
constantly  
     
-  Check DTC memory of Engine Control Module 
(ECM)  Page 01
-15
 . 
      If no DTCs are stored:  
     
-  Connect VAG1598/31 test box at wiring harness 
to ECM, do not connect ECM   Page 24
-17
 . 
     
- Remove instrument cluster:
     
       Repair Manual, Electrical Equipment, Repair 
Group 90, Instrument cluster, removing and installing
   
     
-  Check the following wire connection for short 
circuit to Ground (GND): 
     
Test box  
VAG1598/31  
Socket  
Instrument cluster  
  
Terminal  
47    Electrical Wiring Diagrams, 
Pa
ge 8 of 19 Motronic, On Board Dia
gnostic 
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1