AUDI A6 1997 C5 / 2.G AHA Engine Auxiliary Signals Checking Workshop Manual
  A6 1997 C5 / 2.G
  AUDI
  AUDI
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  AUDI A6 1997 C5 / 2.G AHA Engine Auxiliary Signals Checking Workshop Manual
            
        
  
 
Page 5 of 22
     
Notes:  
     
The A/C compressor is switched off during 
acceleration when the car is stationary or at 
slow speed. 
     At wide open throttle the A/C compressor is 
switched off by the Transmission Control 
Module (TCM) (via the kick down switch). 
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        Page 6 of 22
24-167
      
Continuation  
      If the displayed values are NOT OK:  
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 . 
     
-  Check wiring for open circuit, short circuit to B+ 
or short circuit to Ground between ECM/test box 
terminal 8 and either A/C control head -E87- or 
Transmission Control Module (TCM). 
     
       Electrical Wiring Diagrams, Troubleshooting & 
Component Locations binder         If the wiring is OK:  
     
-  Check function of A/C control head -E87-.
     
       Repair Manual, Heating & Air Conditioning, 
Repair Group 01
   
     
-  Carry out electrical testing of automatic 
transmission. 
       Repair Manual, 5 Spd. Automatic 
Transmission 01V, Repair Group 01  
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        Page 9 of 22
     
Read safety precautions for test driving vehicles 
while using test equipment   page 24
-9 . 
     
The speed signal is generated by the vehicle 
speed sensor (at the transmission), and 
processed at the speedometer/odometer in the 
instrument cluster. 
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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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