display AUDI A4 1995 B5 / 1.G APB Engine Additional Signals Checking User Guide
[x] Cancel search | Manufacturer: AUDI, Model Year: 1995, Model line: A4, Model: AUDI A4 1995 B5 / 1.GPages: 37, PDF Size: 0.14 MB
Page 28 of 37

24-202
      
Checking bus system  
      The principle of the test is independent of the 
number of control modules/systems connected to 
the CAN-bus.  
      The DTC table suggested checking the data 
exchange between the Engine Control Module 
(ECM) and CAN capable control modules.  
     
-  Start engine (if engine will not start, switch 
ignition on). 
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for engine 
electronics using "address word" 01   Page 01
-
9 . 
Rapid data transfer 
HELP
Select function XX
    
When indicated on display:  
-  Press buttons -0- and -8- to select "Read Measuring Value Block" and 
press -Q- button to confirm input. 
Read measurin
g value block 
Q
Enter displa
y group number XXX
    
When indicated on display:  
-  Press buttons -1-, -2- and -5- to select "display group number 125" and 
press -Q- button to confirm input. 
Pa
ge 28 of 37 Additional si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.6 
Page 29 of 37

24-203
 
Read measuring value block 125  
1 
2 
3 
4
    
When indicated on display:  
-  Check indications in display fields 1 through 4.
   CAN capable control modules connected to the Engine Control Module 
(ECM) are indicated: 
 
No indication (display field empty): Control module not CAN-
capable 
 Indication 1: CAN capable control module is connected to databus
 Indication 0: CAN capable control module is not connected to 
databus (e.g. in case of malfunction) 
Read measuring value block 125   
ABS 1 
Combi 1 
    
Example:  
Note:  
Display group 125 indicates all systems that communicate with the Engine 
Control Module (ECM) via the CAN-bus. (In this example, the ABS control 
module and the instrument cluster). If these systems are not installed, the 
display fields in display group 125 that are intended for them will be 
empty. Display field 1 will indicate "Transmission 1" and display field 4 will 
indicate "A/C 1" if these systems are communicated with the Engine 
Control Module (ECM) via the CAN-bus. 
Pa
ge 29 of 37 Additional si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.6 
Page 30 of 37

24-204
 
Read measuring value block 126  
1 
2 
3 
4
    
Note:  
Display group 126 indicates all other systems that communicate with the 
Engine Control Module (ECM) via the CAN-bus. If these systems are not 
installed, the display fields that are intended for them will be empty. 
The following systems will be indicated in display group 126, assuming 
they are communicating with the Engine Control Module (ECM) via the 
CAN-bus: 
Display field 1: automatic distance control; indication: "Distance 1". 
Display field 2: Steering angle sensor; indication: "Steering angle 1" 
Display field 3: Airbag; indication: "Airbag 1". 
Display field 4: System voltage; indication: "cnt. ELEC 1".  -  Check under display group 126 in the same manner.
- 
Press  button.
Rapid data transfer 
HELP
Enter address word XX
    
When indicated on display:  
Pa
ge 30 of 37 Additional si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.6 
Page 31 of 37

24-205
      
-  Press button 0- twice to select "Automatic test 
sequence", address word 00. Press -Q- button 
to confirm input. 
     
 
DTC memory of all OBD capable systems in 
the vehicle will be checked. 
      When a control module responds with its 
identification, the display indicates the number of 
stored errors or indicates "no malfunctions 
recognized".  
      DTCs stored in the system are indicated in 
sequence and printed out. Then the VAG1551 
scan tool sends the next address word.  
VAG - On Board Dia
gnostic 
(OBD
) HELP
1- Rapid data transfer*2- Blink code output*
    
The automatic test sequence is over when the following indication 
appears on the display:  
If a malfunction related to the"powertrain databus" or the "CAN-bus" is 
indicated:  
-  Check whether the Engine Control Module (ECM) and other CAN 
capable control modules installed are appropriate for this vehicle (part 
no. and coding). 
Pa
ge 31 of 37 Additional si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.6