check engine AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1005/w960_1005-0.png AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual

Page 1 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-88
 
     
Auxiliary input signals, 
checking 
     
Rear window defroster signal, checking
 
     
Requirement  
     
Engine Control Module (ECM) coding OK   
page 01
-247
 . 
     
Checking

Page 4 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-90
      
A/C compressor shut-off signal, 
checking
 
     
Note:  
     The A/C compressor is switched off during 
acceleration by the Engine Control Module 
(ECM) and at wide open throttle by the

Page 6 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-91
      
Checking  
     
-  Start engine and let idle. 
     
-  Switch A/C on, push "AUTO" button, set 
temperature to "LO" and blower speed to "HI". 
     
A/C compressor symbol must light up a

Page 12 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-94
      
Engine speed (RPM) signal, checking 
 
     
Notes:  
     The RPM signal is routed from the ECM to 
various electronic systems (e.g. automatic 
transmission, ABS, etc.). The RPM signal i

Page 16 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-96
      
-  Switch Fluke 83 multimeter to voltage 
measurement range and connect between 
signal wire (trip computer 20-pin connector) and 
Ground (GND), using wiring diagram. 
     
-  Start engi

Page 18 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-97
      
Vehicle speed signal, checking
 
     
Note:  
     The vehicle speed signal originates from the 
vehicle speed sensor (on the transmission) and 
is routed to the instrument cluster as we

Page 21 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-99
      
Transmission Range (TR) selector lever 
position signal, checking
 
     
Note:  
     The Engine Control Module (ECM) uses this 
signal to recognize the transmission range 
selector leve

Page 25 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-101
      
Shift procedure, checking
 
     
Notes:  
     
The Engine Control Module (ECM) uses this 
signal to briefly retard the ignition during shifting 
to reduce the mechanical jerking felt b

Page 28 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-103
      
Upshift and downshift signals, checking 
 
     
Notes:  
     
The Engine Control Module (ECM) uses this 
signal in connection with the shift signal to 
determine whether the current si

Page 30 of 37

AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual 24-105
      
Malfunction Indicator Lamp (MIL) wire 
from Transmission Control Module 
(TCM), checking
 
     
Notes:  
     
If a malfunction is recognized by the Engine 
Control Module (ECM) or the
Page:   1-10 11-20 next >