AUDI A8 1996 D2 / 1.G AHA Engine Auxiliary Signals Checking User Guide
								
                                
                
                
                Manufacturer: AUDI, Model Year: 1996,
                  Model line: A8,
                  Model: AUDI A8 1996 D2 / 1.G
                
                
                 Pages: 22, PDF Size: 0.09 MB
                    
                							
              
              
  
                
              
              
    
        
         
         
  
                                   
  AUDI A8 1996 D2 / 1.G AHA Engine Auxiliary Signals Checking User Guide
  A8 1996 D2 / 1.G
  AUDI
  AUDI
  https://www.carmanualsonline.info/img/6/1041/w960_1041-0.png
  AUDI A8 1996 D2 / 1.G AHA Engine Auxiliary Signals Checking User Guide
            
        
  
 
Trending: fuel, diagram, fuse, transmission, ABS, odometer, check engine
Page 11 of 22
24-170
 
  
Display fields  
  
1   2   3   4  
Display group 5: General engine data  
Display   xxx RPM   xx.xx ms   xxx km/h   Idle  
Part throt  
Full throt  
Decel  
Enrich  
Indicates   Engine speed  
(in 40 RPM 
steps)  Engine load   Vehicle speed   Operating 
condition  
Range   0 - 6800 RPM   0.00 - 12.75 
ms  0 - 326 km/h   ---  
Specified 
value  ---   ---   Approx. vehicle speed   ---  
  
---   ---   If no vehicle speed is displayed   page 24
-171
 , 
Continuation  
---  
      If displayed value is OK:  
     
- 
Press  button. 
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        Page 12 of 22
     
-  Press buttons -0- and -6- to select "End Output" 
function 06, and press -Q- button to confirm 
input. 
     
-  Switch off ignition. 
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        Page 13 of 22

24-171
      
Continuation  
      If no speed was indicated:  
    
Notes: 
If the LED does not blink:  
If the wiring is OK and the LED does not blink:  
 Repair Manual, Electrical Equipment, Repair Group 90
    -  Connect VAG1598/22 test box to ECM harness connector   page 01
-
67
 . 
-  Connect VAG1527B LED voltage tester between ECM/test box sockets 
3 (B+) and 20 (signal). 
-  Lift vehicle at left-front until wheel is free.
-  Switch ignition on and rotate left-front wheel by hand.
   LED must blink (very brief blink)
The right-front wheel must not rotate; block it if necessary.For LEDs with little voltage consumption, the LED lights up at half 
strength when the ignition is switched on. 
-  Check wiring from ECM connector, terminal 20 to instrument cluster for 
open circuit or short circuit   Electrical Wiring Diagrams, 
Troubleshooting & Component Locations binder. 
- 
Check readiness code   page 01
-70
 . If Diagnostic Trouble Code 
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        Page 14 of 22
(DTC) memory has been erased, or ECM was disconnected, generate 
new readiness code   page 01
-73
 . 
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        Page 15 of 22
24-172
      
CAN-Bus, checking
 
      When a CAN-Bus malfunction is indicated during 
a check of DTC memory of the Engine Control 
Module (ECM), refer to the following test to 
eliminate the malfunction.  
     
Note:  
     
The information exchange occurs between the 
Engine Control Module (ECM) and the 
Transmission Control Module (TCM) via a CAN-
Bus. 
     All signals are carried by 2 wires between the 
ECM and the TCM. 
     
Required special tools and test equipment  
     VAG1551 or VAG1552 Scan Tool (ST) with 
VAG1551/3 adapter cable 
     VAG1598/22 test box 
     VW1594 connector test kit 
     Wiring diagrams 
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        Page 16 of 22
24-173
      
Checking  
     
-  Check DTC memory of Transmission Control 
Module (TCM). 
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01        If a DTC regarding the CAN-Bus wire is also 
stored in the TCM:  
     
-  Switch ignition off.
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations 
binder   
If wiring is OK:  -  Connect VAG1598/22 test box to ECM harness connector   page 01
-
67
 . 
-  Check wires from terminal 29 and terminal 41 of test box to 
transmission control module for open or short circuit per wiring 
diagram. -  Replace Transmission Control Module (TCM) and Engine Control 
Module (ECM) as necessary and in sequence. 
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        Page 17 of 22

24-174
      
Rough road signal from ABS/EDL 
control module, checking
 
     
Notes:  
     
When the ABS/EDL control module senses a 
wheel spinning, it produces the rough road 
signal. When the ECM recognizes the rough 
road signal, the misfire recognition is switched 
off. 
     Check the rough road signal only when the 
trouble code 18014 "Rough Road Spec Engine 
Torque ABS-ECU Electrical Malfunction" is 
stored. The possible "Misfire" malfunction is in 
this case a subsequent malfunction that can be 
disregarded. 
     The wiring and the rough road signal are 
monitored by the ECM. 
     Emissions testing on a front-wheel drive vehicle 
with ABS/EDL, during which only the front 
wheels turn while the rear wheels are 
stationary, can result in the DTC 18014 being 
stored in DTC memory. Therefore, the fuse for 
the ABS/EDL control module must be removed. 
After the test, check DTC memory for the 
ABS/EDL control module and the ECM. Then 
erase DTC memory. 
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        Page 18 of 22
     
Required special tools and test equipment  
     
VAG1551 or VAG1552 Scan Tool (ST) with 
VAG1551/3 adapter cable 
     VAG1598/22 test box 
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        Page 19 of 22
24-175
      
Test requirements  
     
ECM coding OK   page 01
-14
 
     
Test sequence  
     
-  Switch ignition off.
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 . 
    
 Electrical Wiring Diagrams, Troubleshooting & Component Locations 
binder   
If the wiring is OK:  
If the malfunction occurs again after the ABS control module has been 
replaced:  -  Check signal wiring between ECM/test box terminal 45 and ABS 
control module for short circuit or open circuit. -  Replace ABS control module.
-  Replace Motronic ECM -J220-   page 01
-68
 .
-  Carry out adaptation of throttle valve control module to ECM   page 
24
-150
 . 
- 
Check readiness code   page 01
-70
 . If Diagnostic Trouble Code 
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        Page 20 of 22
(DTC) memory has been erased, or ECM was disconnected, generate 
new readiness code   page 01
-73
 . 
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Trending: ignition, sensor, lights, transmission, wiring, ECU, ABS