AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual A4 1995 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1057/w960_1057-0.png AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual

Page 1 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-165
 
  
Additional signals, testing Special Tools and Equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
 VAS5051 with VAG5051/1
- or 
 VAG1551 with VAG1551/3B
Pa
ge 1 of 44 Additional si
gnal

Page 2 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-166
      
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 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-167
      
Consumption signal for on board 
computer, checking
 
     
Notes:  
     
The consumption signal is calculated by the 
ECM from the injection time and directed to the 
on board computer

Page 4 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-168
      
Vehicle speed signal, checking
 
     
Notes:  
     
The vehicle speed signal is generated by the 
Vehicle Speed Sensor (VSS) -G68- (at 
transmission) and processed in the instrument 
c

Page 5 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-169
      
Test sequence  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for engine 
electronics using "address word" 01   Page 01
-
9 . 
     
   Engine must

Page 6 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-170
      
-  Connect VAG1598/31 test box at wiring harness 
to ECM, do not connect ECM   Page 24
-17
 . 
     
-  Connect VAG1527B voltage tester to sockets 3 
(B+) and 54 (VSS) of VAG1598/31 test

Page 7 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-171
      
Wire for fuel level signal, checking
 
     
Notes:  
     
The Engine Control Module (ECM) receives the 
fuel level signal from the instrument cluster. 
     The processed signal enters

Page 8 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-172
      
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 ECM can switch o

Page 9 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual      
Vehicle at room temperature (warmer than 
+15 C). 
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Page 10 of 44

AUDI A4 1995 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-173
      
Test sequence  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for engine 
electronics using "address word" 01   Page 01
-
9 . 
     
   Engine must
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