Page 25 of 37
24-101
      
Shift procedure, checking
 
     
Notes:  
     
The Engine Control Module (ECM) uses this 
signal to briefly retard the ignition during shifting 
to reduce the mechanical jerking felt between 
shifts. 
     The shift signal is monitored by the 
Transmission Control Module (TCM). 
     
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01; On Board Diagnostic
   
      Carry out the following check only if a shift-
related DTC is stored in the TCM DTC memory.  
     
Checking requirement  
     
Control module coding OK   page 01
-247
 
     
CAUTION! 
     
Always use a second technician to operate 
the VAG 1551 scan tool while driving.  
     
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        Page 26 of 37
-  Test drive and select "Read Measuring Value 
Block" function 08, display group 004   page 
01
-249
 . 
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        Page 27 of 37
24-102
 
Read measuring value block 4 1 2 3 4
    
Indicated on display; note display field 4  
Notes:  
Due to its short signal duration, shifting cannot always be observed on the 
VAG 1551 scan tool. 
CAUTION! 
Do not use the shift inputs (identified by an X) during the shift signal 
check. 
If the change in the shift signal display did not occur, even though the 
control module coding was OK:     Specified value: XXX_X0 
Shift value must increase briefly during shifting. 
   Specified value: XXX_X1 
- 
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. 
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        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
 . 
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        Page 29 of 37
24-104
      
Throttle position sensor output signal, 
checking
 
     
Notes:  
     
The Transmission Control Module (TCM) 
interprets this information as a load signal. 
     This signal is monitored by the TCM.
     
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01; On Board Diagnostic
   
     
Checking requirement  
     
Control module coding OK   page 01
-247
 . 
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        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
 . 
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        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. 
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        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. 
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