AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual A4 1999 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1049/w960_1049-0.png AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual

Page 1 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-179
 
     
Additional signals, checking 
     
Engine speed (RPM) signal, checking 
 
     
Note:  
     The engine speed signal is taken from terminal 
37 on the Engine Control Module (ECM). The

Page 2 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-180
      
Fuel consumption signal for on-board 
computer, checking
 
     
Notes:  
     
The fuel consumption signal is calculated by the 
engine control module (on the basis of the 
injection pe

Page 3 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-181
      
Coolant temperature signal, checking
 
     
Notes:  
     
The engine control module receives the coolant 
temperature signal from the instrument cluster. 
When the signal is received,

Page 4 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-182
      
Vehicle Speed Signal (VSS), checking
 
     
Notes:  
     
The vehicle speed signal is generated by the 
Vehicle Speed Sensor (VSS) -G68 (on the 
transmission) and is processed in the

Page 5 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual always be fastened to and operated from the rear seat by a 
second technician. When driving or riding in an airbag equipped vehicle, NEVER hold 
the scan tool or other test equipment in your hands or

Page 6 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-183
      
-  Take vehicle for a test drive and check whether 
vehicle speed appears in display field 3. 
     
-  If vehicle speed does not appear, raise the 
vehicle (preferably using a lift) unt

Page 7 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-184
      
Fuel tank level signal, checking
 
     
Note:  
     
The Engine Control Module (ECM) receives the 
fuel tank level signal from the instrument 
cluster. 
     The processed signal enter

Page 8 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-185
      
Brake light switch -F and brake pedal 
switch -F47, checking 
 
     
-  Connect vehicle diagnostic, testing and 
information system VAS 5051 or VAG1551 scan 
tool and select engine elec

Page 9 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-186
 
Read Measuring Value Block 66  
1 
2 
3 
4
    
Indicated on display  
-  Observe brake light/brake pedal switch in display field 2.
  
Display fields  
  
1   2   3   4  
Display Group 066:

Page 10 of 37

AUDI A4 1999 B5 / 1.G APB Engine Additional Signals Checking Workshop Manual 24-187
       If display does not appear as described:  
     
Check switch 
     
-  Remove storage compartment on drivers 
side. 
     
       Repair Manual, Body Interior, Repair Group 
68
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