1999 AUDI A4 check engine

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Page 28 of 37

AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-103
      
Upshift and downshift signals, checking 
 
     
Notes:  
     
The Engine Control Module (ECM) uses this 
signal in connection with the shift signal to 
determine whether the current si

Page 30 of 37

AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-105
      
Malfunction Indicator Lamp (MIL) wire 
from Transmission Control Module 
(TCM), checking
 
     
Notes:  
     
If a malfunction is recognized by the Engine 
Control Module (ECM) or the

Page 31 of 37

AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-106
      
-  Switch ignition ON.
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 027, display field 1   page 01
-249
 . 
Read measuring value bl

Page 32 of 37

AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-107
      
Fuel level signal (from instrument 
cluster), checking
 
     
Notes:  
     
If the fuel level in the tank is too low (less than 
3.2 gal); combustion misfire, oxygen sensor and 
fuel s

Page 33 of 37

AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-108
      
-  Switch ignition ON.
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 027, display field 2   page 01
-249
 . 
Read measuring value bl

Page 34 of 37

AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-109
      
Rough road condition signal, checking
 
     
ABS control module with ABS/EDL  
     
Notes:  
     
Misfires can result in malfunctions such as 
"Combustion misfire" being recorded in D
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