AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual https://www.carmanualsonline.info/img/6/1071/w960_1071-0.png AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual

Page 1 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-155
 
  
Additional signals, checking Special tools and equipment  
 
VAG1526A
 VAG1527B
 VAG1594A
 VAG1598/31
 VAS5051 with VAG5051/1
- or 
 VAG1551 with VAG1551/3A
Pa
ge 1 of 27 Additional si
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Page 2 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-156
      
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 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-157
      
Vehicle speed signal, checking
 
     
Note:  
     
The vehicle speed signal is generated by the 
speedometer Vehicle Speed Sensor (VSS) -
G22- (at transmission) and is processed in the

Page 4 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-158
      
WARNING! 
     
To reduce the risk of accident during road 
tests, always observe safety precautions   
Page 24
-1 . 
Rapid data transfer 
HELP
Select function XX
    
When indicated on

Page 5 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-159
      
-  Connect VAG1598/31 test box at wiring harness 
to Engine Control Module (ECM), do not connect 
ECM  Page 24
-19
 . 
     
-  Connect VAG1527B voltage tester to sockets 3 
(B+) and 54

Page 6 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-160
      
A/C compressor shut-off, checking
 
     
Note:  
     
The A/C compressor signal communicates to 
the ECM that the compressor will be switched 
on in 140 ms. 
     The Engine Control Mo

Page 7 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual Module (ECM). 
     Vehicle at room temperature (warmer than 
+15 C). 
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Page 8 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-161
      
Test sequence  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select control module for engine electronics 
using "address word" 01   Page 01
-10
 . Engine 
must run at idle.

Page 9 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual 24-162
      
-  Depress gas pedal completely (swiftly) and then 
release it (brief acceleration). 
     
 
Specified value in display field 4: Indication 
jumps for a few seconds from "Compr. ON" 
to

Page 10 of 27

AUDI A6 1995 C5 / 2.G ATW Engine Additional Signals Workshop Manual      
-  If there are no malfunctions in the wiring, check 
function of A/C system. 
     
       Repair Manual, Heating & Air Conditioning, 
Repair Group 01; On Board Diagnostic (OBD) of A/C system
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