check engine AUDI A4 1996 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1996, Model line: A4, Model: AUDI A4 1996 B5 / 1.GPages: 22, PDF Size: 0.09 MB
Page 3 of 22

24-165
      
Checking  
     
-  Connect VAG1551 or VAG1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with engine 
running at idle)   page 01
-8 . 
Rapid data transfer 
HELP
Select function XX
    
Indicated on display  
-  Press buttons -0- and -8- to select "Read Measuring Value Block" 
function 08, and press -Q- button to confirm input. 
Read Measurin
g Value Block 
HELP
Input displa
y group number XXX
    
Indicated on display  
-  Press buttons -0-, -5- and -0- to input display group number 50 (050), 
and press -Q- button to confirm input. 
Read Measuring Value Block 50 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
-  Switch on A/C (lowest temperature and highest fan position).
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24-166
      
-  Compare display with specified values for A/C 
(in display field 4). 
  
Display fields  
  
1   2   3   4  
Display group 50: Signals to Engine Control Module (ECM)  
Display   xxxx RPM   xxxx RPM   A/C-LOW  
A/C-HIGH  Compr. ON  
Compr. OFF  
Indicates   Actual engine 
speed  
(in 10 RPM steps)  Specified engine 
speed  
(in 10 RPM steps)  IAC boost   A/C compressor status  
Range   0 - 2550 RPM   ---   ---   ---  
Specified 
value  620 - 740 RPM  
(all-wheel drive)  
or  
740 - 860 RPM  
(front-wheel drive)  680 RPM  
(all-wheel drive)  
or  
800 RPM  
(front-wheel drive)  A/C-LOW  
(all-wheel drive)  
or  
A/C-HIGH  
(front-wheel 
drive)  Compressor on: Comp. ON  
Compressor off: Comp. OFF  
  
---   ---   ---   If not as specified   page 24
-167
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Continuation  
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Page 10 of 22

24-169
      
Test procedure  
     
-  Connect VAG1551 or VAG1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with engine 
running at idle)   page 01
-8 . 
Rapid data transfer 
HELP
Select function XX
    
Indicated on display  
-  Press buttons -0- and -8- to select "Read Measuring Value Block" 
function 08, and press -Q- button to confirm input. 
Read Measurin
g Value Block 
HELP
Input displa
y group number XXX
    
Indicated on display  
-  Press buttons -0-, -0- and -5- to input display group number 5 (005), 
and press -Q- button to confirm input. 
Read Measuring Value Block 5 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
-  Road test and compare indicated vehicle speed with value in display 
field 3 (2nd technician required,   Safety precautions   page 24
-9 ). 
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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 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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