AUDI A4 1996 B5 / 1.G AFC Engine Auxiliary Input Signals Checking User Guide
								
                                
                
                
                Manufacturer: AUDI, Model Year: 1996,
                  Model line: A4,
                  Model: AUDI A4 1996 B5 / 1.G
                
                
                 Pages: 37, PDF Size: 0.15 MB
                    
                							
              
              
  
                
              
              
    
        
         
         
  
                                   
  AUDI A4 1996 B5 / 1.G AFC Engine Auxiliary Input Signals Checking User Guide
  A4 1996 B5 / 1.G
  AUDI
  AUDI
  https://www.carmanualsonline.info/img/6/1005/w960_1005-0.png
  AUDI A4 1996 B5 / 1.G AFC Engine Auxiliary Input Signals Checking User Guide
            
        
  
 
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Page 11 of 37
     
- Replace ECM   page 01
-265
 .
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        Page 12 of 37
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 is 
monitored by the different electronic systems. 
      Carry out the following check only if the 
tachometer (in the instrument cluster) is 
inoperative, or if the A/C compressor is not 
running.  
     
-  Connect VAG 1367 engine-tester to tachometer 
using wiring diagram. 
     
-  Connect VAG 1367 engine-tester signal wire 
(green terminal) to instrument cluster RPM 
terminal and A/C control module RPM terminal 
(connector remains connected). 
     
-  Start engine and let idle.
     
RPM must be displayed again 
      If the specified value is obtained, the malfunction 
is in instrument cluster or on A/C control module.  
      If the RPM is not displayed on VAG 1367 engine-
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        Page 13 of 37
tester:  
     
-  Check wiring between ECM terminal C10 and 
instrument cluster or A/C control module using 
wiring diagram. 
      If wiring is OK:  
     
- Replace ECM   page 01
-265
 .
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        Page 14 of 37
24-95
      
Fuel consumption signal, checking
 
     
Notes:  
     
The consumption signal is internally calculated 
by the ECM using "injection time." 
     The consumption signal is routed to both the 
trip computer and the Transmission Control 
Module (TCM). 
     The consumption signal is monitored by the 
TCM 
     
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01; On Board Diagnostic
   
      Carry out the following check only if DTC 
memory contains a stored DTC for the TCM 
related to the consumption signal, or a missing or 
false consumption signal, determined during the 
trip computer check.  
     
-  Remove instrument cluster or TCM.
     
       Repair Manual, Electrical Equipment, Repair 
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        Page 15 of 37
Group 90; Instrument cluster, repairing
   
     
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01, On Board Diagnostic
   
     
-  Connect VAG 1598 test box to instrument 
cluster harness connector (I/P insert not 
connected) or to TCM harness connector (TCM 
not connected). 
     
       Repair Manual, Electrical Equipment, Repair 
Group 90; Instrument cluster, repairing
   
     
       Repair Manual, 5 Spd. Automatic 
Transmission 01V; Repair Group 01, On Board Diagnostic
   
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        Page 16 of 37
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 engine and let idle. 
     
   Specified value: approx. 0.3 to 0.6 volts, 
corresponding to engine speed (RPM) 
     
-  Vary engine speed continuously from 1000 to 
4000 RPM. 
     
   Specified value: approx. 0.3 to 0.6 volts, 
corresponding to engine speed (RPM) 
      If the specified value is not obtained, even 
though the trip computer shows no consumption 
value or there is a stored malfunction in the 
TCM:  
     
-  Stop engine (switch ignition off).
     
-  Replace trip computer and/or TCM as 
required. 
      If the specified value is not obtained:  
    
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        Page 17 of 37
If wiring OK and the specified value is not obtained:  -  Check wiring between ECM terminal C12 and black 20-pin trip 
computer connector, using wiring diagram. 
- Replace ECM   page 01
-265
 .
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        Page 18 of 37
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 well as to 
the Engine Control Module (ECM). 
     
Speedometer in instrument cluster OK 
     
Checking  
     
-  Using VAG 1551 scan tool, select "Read 
Measuring Value Block" function 08, display 
group 003   page 01
-249
 . 
Read measuring value block 3 1 2 3 4
    
Indicated on display  
-  Observe display field 4 while accelerating from standstill.
   Specified values: 
 
0 mph (at standstill) 
 Actual speed (vehicle driven)
- 
Press  button.
-  Select "End Output" function 06.
-  Press -Q- button to confirm input.
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        Page 19 of 37
24-98
       If no vehicle speed is displayed between 
standstill and moving:  
     
-  Switch ignition OFF and connect VAG 1598/19 
test box   page 01
-255
 . 
     
-  Connect VAG 1527B voltage tester between test 
box sockets 13C (signal) and 10D (B+). 
     
-  Raise front of vehicle until left-front wheel is free 
to rotate. 
     
Note:  
     The right front wheel must NOT rotate. 
     
-  Switch ignition ON.
     
Voltage tester must light up at half strength 
     
-  Rotate left front wheel by hand.
     Voltage tester must become brighter (flash) 
      If tester does not light up (become brighter) or 
flash:  
     
- 
Check wiring between test box socket 13X and 
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        Page 20 of 37
vehicle speed sensor, using wiring diagram. 
    
If wiring is OK, replace vehicle speed sensor.  
If voltage tester does not light up (become brighter) or flash, replace ECM 
 page 01
-265
 .   -  Find and eliminate open circuit in wiring between terminal C13 and 
vehicle speed sensor. 
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