lock AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 2000, Model line: A4, Model: AUDI A4 2000 B5 / 1.GPages: 37, PDF Size: 0.15 MB
Page 1 of 37

24-88
 
     
Auxiliary input signals, 
checking 
     
Rear window defroster signal, checking
 
     
Requirement  
     
Engine Control Module (ECM) coding OK   
page 01
-247
 . 
     
Checking  
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 004, display field 4   page 01
-249
 . 
Read measuring value block 4 1 2 3 4
    
Indicated on display, note value in display field 4  
CAUTION! 
Do not use the shift inputs (identified by an X) during the RPM 
increase check. 
If display value is OK:     Specified value: 0XX_XX 
-  Switch ON rear window defroster.
   Specified value: 1XX_XX 
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Page 6 of 37

24-91
      
Checking  
     
-  Start engine and let idle. 
     
-  Switch A/C on, push "AUTO" button, set 
temperature to "LO" and blower speed to "HI". 
     
A/C compressor symbol must light up and 
A/C must run. 
     
-  Using VAG 1551 scan tool, select "Basic 
Setting" function 04, display group 004   page 01
-150
 . 
     
A/C compressor must stop (visual check) 
      If the A/C compressor does not shut off:  
     
-  Switch A/C off (press "minus" button for fresh air 
blower in A/C control head repeatedly, until all 
indicators are off). 
     
   Continue to let engine run in idle.
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 004. 
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Page 7 of 37

Read measuring value block 4 1 2 3 4
    
Indicated on display; note value in display field 4  
CAUTION! 
Do not use the shift inputs (identified by an X) during the RPM 
increase check. 
-  Switch on A/C as described.
   Specified value: X1X_XX 
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Page 18 of 37

24-97
      
Vehicle speed signal, checking
 
     
Note:  
     The vehicle speed signal originates from the 
vehicle speed sensor (on the transmission) and 
is routed to the instrument cluster as well as to 
the Engine Control Module (ECM). 
     
Speedometer in instrument cluster OK 
     
Checking  
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 003   page 01
-249
 . 
Read measuring value block 3 1 2 3 4
    
Indicated on display  
-  Observe display field 4 while accelerating from standstill.
   Specified values: 
 
0 mph (at standstill) 
 Actual speed (vehicle driven)
- 
Press  button.
-  Select "End Output" function 06.
-  Press -Q- button to confirm input.
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Page 21 of 37

24-99
      
Transmission Range (TR) selector lever 
position signal, checking
 
     
Note:  
     The Engine Control Module (ECM) uses this 
signal to recognize the transmission range 
selector lever position. When a driving mode is 
selected, idle speed should drop by approx. 50 
RPM to reduce creep. 
     
Checking requirement  
     
Control module coding OK   page 01
-247
 . 
     
-  Switch ignition ON.
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 004, display field 4   page 01
-249
 . 
Read measuring value block 4 1 2 3 4
    
Indicated on display  
CAUTION!     Specified value: XXX_1X (TR selector lever in P or N)
-  Apply brake and select drive mode (1, 2, 3, R or D).
   Specified value: XXX_0X 
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Page 23 of 37

24-100
      
- 
Press  button.     
-  Select "End Output" function 06 and press -Q- 
button to confirm input. 
      If a display did NOT change, even though coding 
is OK:  
     
-  Connect VAG 1598/19 test box to ECM harness 
connector  page 01
-255
 . 
     
-  Connect VAG 1527B voltage tester between test 
box sockets 11B (signal) and 10B (constant 
B+/terminal 30). 
     
Voltage tester must light up (with TR selector 
lever in P or N), then go out with drive mode 
(1, 2, 3, R or D) selected 
      If voltage tester lights up and goes out when 
drive mode is selected, even though the range 
indicator in the "Read measuring value block" is 
OK:  
     
- Replace ECM   page 01
-265
 .
      If voltage tester lights up constantly or not at all:  
    
- 
Check wiring for short to ground, short to B+ or open circuit between 
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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 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 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. 
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