Page 28 of 37
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 signal is an 
upshift or downshift. 
     The signal for upshift and downshift is 
monitored by the Transmission Control Module 
(TCM). 
     
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01; On Board Diagnostic
   
     
Checking requirement  
     
Control module coding OK   page 01
-247
 . 
Pa
ge 28 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25 
         
        
        
     
        
        Page 30 of 37
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 Transmission 
Control Module (TCM), it is indicated by the 
Malfunction Indicator Lamp (MIL) in the 
instrument cluster. 
     If the TCM recognizes a malfunction, the MIL is 
switched on via the ECM. 
     The MIL wiring is monitored by the ECM.
     
Checking requirement  
     Control module coding OK   page 01
-247
 . 
Pa
ge 30 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25 
         
        
        
     
        
        Page 31 of 37
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 block 27 1 2 3 4
    
Indicated on display; note display field 1  
If the specified value is not obtained, even though coding is OK:     Specified value: 0
-  Start engine and let idle. 
   Specified value: 1
- 
Press  button.-  Select "End Output" function 06.
-  Press -Q- button to confirm input.
-  Connect VAG 1598/19 test box to ECM harness connector   page 01
-
255
 . 
-  Check wiring for open or short circuit between ECM and TCM, using 
wiring diagram. 
Pa
ge 31 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25 
         
        
        
     
        
        Page 32 of 37
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 system malfunctions could occur. In these 
cases the malfunction "Fuel tank level too low" 
is stored in DTC memory. 
     The fuel tank level signal is monitored by the 
Engine Control Module (ECM). 
     
Checking requirements:  
     Control Module coding OK   page 01
-247
 . 
     
Fuel content greater than 3.2 gal (12 liters). 
     Instrument cluster fuel gauge OK. 
Pa
ge 32 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25 
         
        
        
     
        
        Page 33 of 37
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 block 27 1 2 3 4
    
Indicated on display; note display field 2  
If the specified value is not obtained, even though coding is OK:     Specified value: 0
-  Start engine and let idle. 
   Specified value: 1
- 
Press  button.-  Select "End Output" function 06.
-  Press -Q- button to confirm input.
-  Connect VAG 1598/19 test box to ECM harness connector   page 01
-
255
 . 
-  Check wiring for open or short circuit between ECM and instrument 
cluster, using wiring diagram. 
Pa
ge 33 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25 
         
        
        
     
        
        Page 34 of 37
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 DTC 
memory due to road wheel malfunctions. 
     If the ABS control module recognizes a free 
turning wheel, it generates a rough road signal. 
     If the Engine Control Module (ECM) recognizes 
the rough road signal, misfire recognition is 
switched off in the ECM. 
     The rough road signal is created to check 
whether DTC 18014 "Rough Road Spec Engine 
Torque ABS-SG Electrical Malfunction" is 
stored in DTC memory. The "Combustion 
misfire" malfunction results from this signal and 
can be ignored. 
     The rough road signal is monitored by the 
ECM. 
     
Checking requirement  
     
Pa
ge 34 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25