engine AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual

AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1057/w960_1057-0.png AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual

Page 2 of 44

AUDI A4 2000 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 5 of 44

AUDI A4 2000 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 7 of 44

AUDI A4 2000 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 2000 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 10 of 44

AUDI A4 2000 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

Page 13 of 44

AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-175
      
A/C system signal, checking
 
      The A/C system signal notifies the Engine 
Control Module (ECM), that the A/C system 
requires a higher idle speed to achieve the 
desired interior te

Page 14 of 44

AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-176
 If specified values are not obtained:  
Read Measuring Value Block 
Q
Input displa
y group number XXX
    
When indicated on display:  
-  Press buttons -0-, -5- and -6- to select "display gro

Page 16 of 44

AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-178
      
Brake light switch and brake pedal 
switch, checking
 
     
Note:  
     For safety reasons, the instruction from the 
accelerator pedal sensor (potentiometer) to the 
ECM to open the t

Page 17 of 44

AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-179
 
Read Measurin
g Value Block 
Q
Input display group number XXX
    
When indicated on display:  
-  Press buttons -0-, -6- and -6- to select "display group number 066" and 
press -Q- button to

Page 24 of 44

AUDI A4 2000 B5 / 1.G ATQ Engine Additional Signals Testing Workshop Manual 24-183
      
Clutch vacuum vent valve switch -F36-, 
checking
 
     
Note:  
     This signal helps prevent excessive RPM 
oscillations and tip-in shocks when clutch is 
disengaged and is required f
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