check engine AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual

AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual A3 2000 8L / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1071/w960_1071-0.png AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual

Page 2 of 27

AUDI A3 2000 8L / 1.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 A3 2000 8L / 1.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 5 of 27

AUDI A3 2000 8L / 1.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 A3 2000 8L / 1.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 8 of 27

AUDI A3 2000 8L / 1.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 A3 2000 8L / 1.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 11 of 27

AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual 24-163
      
Wire for crash signal, checking
 
      The Engine Control Module (ECM) receives the 
crash signal ("Crash shut-off was triggered") from 
the airbag control module.  
      When the airb

Page 14 of 27

AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual 24-166
      
Wire for fuel level signal, checking
 
     
Note:  
     
The signal helps with cause localization when 
certain malfunctions are recognized (e.g. 
combustion misfires). 
     The proce

Page 16 of 27

AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual 24-167
      
Signal for rough terrain recognition, 
checking
 
     
Note:  
     
When the ABS/EDL control module recognizes 
that a wheel is spinning, the ABS/EDL control 
module generates the roug

Page 17 of 27

AUDI A3 2000 8L / 1.G ATW Engine Additional Signals Workshop Manual 24-168
      
Test requirement:  
     
Control module coding OK   Page 01
-62
 . 
     
Test sequence  
     
-  Switch ignition off.
     
-  Connect VAG1598/31 test box at wiring harness 
to Engine
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