AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual A4 1998 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1086/w960_1086-0.png AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual

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AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-163
 
  
Additional signals, checking Special Tools and Equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
 VAS5051 with VAG5051/1
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Page 2 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-164
      
Engine speed signal, checking
 
     
Note:  
     The engine speed signal is output at terminal 37 
of the Engine Control Module (ECM). The signal 
is used, among other things, for RPM

Page 3 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-165
      
Vehicle speed signal, checking
 
     
Notes:  
     
The vehicle speed signal is generated by the 
speedometer Vehicle Speed Sensor (VSS) -
G22- (at transmission) and is processed in th

Page 4 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual      
- Connect VAS5051 tester   Page 01
-7 and 
select vehicle system "01 - Engine electronics". 
Engine must run at idle for this. 
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Page 5 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-166
 
    
Display on VAS5051:  
-  Select diagnostic function "08 - Read Measuring Value Block" in 
selection -1-. 
    
Display on VAS5051:  
1 - Enter display group Max. input value = 255
-  Sel

Page 6 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-167
 
    
Display on VAS5051:  
-  Determining via road test whether vehicle speed is displayed in display 
field -3-. 
-  If vehicle speed is not display, lift vehicle -if possible using a vehicl

Page 7 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-168
       If LED does not blink:  
     
-  Check the following wire connection for open 
circuit and short circuit to Ground (GND) and B+:
     
Test box  
VAG1598/31  
Socket  
Instrument cluste

Page 8 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-169
      
A/C compressor shut-off, checking
 
     
Notes:  
     
The A/C compressor signal communicates to 
the ECM that the compressor will be switched 
on in 140 ms. 
     The Engine Control M

Page 9 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-170
      
Test requirements:  
     
A/C system OK 
     No DTCs in DTC memory of Engine Control 
Module (ECM). 
     Vehicle at room temperature (warmer than 
+15 C). 
     
Test sequence

Page 10 of 25

AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual 24-171
 
    
Display on VAS5051:  
1 - Enter display group Max. input value = 255
-  Select function "050" in button field -2- for "display group number 050" 
and press Q button to confirm input.
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