AUDI A8 1996 D2 / 1.G AEB Engine Throttle Valve Control Module And Checking
Manufacturer: AUDI, Model Year: 1996, Model line: A8, Model: AUDI A8 1996 D2 / 1.GPages: 38, PDF Size: 0.12 MB
Page 11 of 38

24-105
      
Continuation  
     
-  Switch ignition off.
     
-  Connect VAG 1598/22 test box to ECM harness 
connector  Page 01
-56
 . 
     
-  Connect multimeter US1119 (Fluke 83 or 
similar) and check resistance between test box 
sockets 67and 69. 
     
  
Specified value: max. 5.0      
- 
Open throttle slowly. Specified value:       If resistance is NOT OK:  
    
-  Disconnect 8-pin harness connector for throttle valve control module -
J338-. 
-  Check wiring for open circuit between ECM/test box and 8-pin harness 
connector. 
 
Connector terminal 3 to ECM/test box socket 69
 Connector terminal 7 to ECM/test box socket 67
 Specified value: max. 1.5 
-  Check wiring for short circuit between ECM/test box and 8-pin harness 
connector. 
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Page 12 of 38

 
Connector terminal 7 to ECM/test box socket 69
 Specified value:   
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Page 13 of 38

24-106
      
-  Reconnect throttle valve control module harness 
connector. 
      If wiring is OK:  
     
-  Replace throttle valve control module -J338-.
     
-  Carry out adaptation of throttle valve control 
module to ECM   Page 24
-119
 . 
     
- Check readiness code   Page 01
-59
 . If 
Diagnostic Trouble Code (DTC) memory has 
been erased, or ECM was disconnected, 
generate new readiness code   Page 01
-62
 . 
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Page 14 of 38

24-107
      
Throttle drive and angle sensor for 
throttle drive, checking
 
     
Note:  
     Throttle drive -G186- and angle sensor -1- for 
throttle drive -G187- are located in the throttle 
valve control module -J338-. 
     
Test conditions  
     
Throttle valve in closed throttle position; if 
necessary adjust accelerator pedal cable 
     
       Repair Manual, Fuel Supply System, Repair 
Group 20
   
     
Cruise control adjustment OK 
     Power supply for throttle valve control 
module OK; checking   Page 24
-101
 
     
Engine coolant temperature at least 80 C 
(176 F) 
     
Automatic transmission selector lever in "P" 
or "N" 
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Page 15 of 38

24-108
      
Checking  
     
-  Connect VAG 1551 or VAG 1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with engine 
running at idle)   Page 01
-7 . 
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 -5- to input display group number 55, and 
press -Q- button to confirm input. 
Read Measuring Value Block 55 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
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Page 16 of 38

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-  Compare display with specified values for idle 
air control (display fields 1-4): 
  
Display fields  
  
1   2   3   4  
Display group 55: Idle control  
Display   xxx RPM   x.xx g/s   x.xx g/s   xxxx  
Indicates   Engine speed RPM  
(in steps of 10 RPM)  Regulating value-idle mass 
air flow (idle air control)  Learning value-idle 
mass air flow  Operating 
conditions  
Range   0-2550 RPM   -2.80 to 4.17 g/s   -1.94 to 2.22 g/s   ---  
Specified 
value  820-900 RPM   -1.11 to 1.11 g/s   -1.11 to 1.11 g/s   0000  
  
If engine speed is NOT OK   
Page 24
-111
 , Continuation  
If display is NOT OK   Page 24
-110
 , Evaluating 
display group 55  
Explanation  
Page 24
-110
   
      If displayed values are OK:  
     
- 
Press  button to advance program 
sequence.      
-  Press buttons -0- and -6- to select "End Output" 
function 06, and press -Q- button to confirm 
input. 
     
-  Switch ignition off.
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Page 17 of 38

24-110
 Evaluating display group 55  Display group: 
55  
  
  
Display fields: 
2  3  
Possible cause  
Corrective action  
above 1.11 
g/s   
Increased load because of 
switched-on consumers 
 Throttle valve mechanism sticking
 Air passage in area of throttle 
valve contaminated   - Switch off electrical consumers
- Visually check, repair if necessary
below -1.11 
g/s   Intake air leak (false air) behind 
throttle valve 
 Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, 
Engine Code(s): AEB, ATW, Repair Group 26
    - Check intake air system for leaks (false air)   Page 24
-97
- Check exhaust system:
Explanation of the 4-digit display  
Explanation when display field is = 0  
x  
x  
x  
x  
(Display group 55)  
         0   A/C compressor off (0 = A/C compressor off /1 = A/C compressor on)  
      0      Shift lever in P or N (0 = Shift lever in P or N/ 1 = Shift lever in 2/3/4/R/D)  
   0         Always "0"  
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Page 18 of 38

0            Always "0"  
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Page 19 of 38

24-111
      
Continuation  
     
-  Switch ignition off.
     
-  Connect VAG 1598/22 test box to ECM harness 
connector  Page 01
-56
 . 
     
-  Switch ignition on.
     
-  With throttle valve in closed throttle position, 
connect multimeter US 1119 (Fluke 83 or 
equivalent), and check resistance between 
ECM/test box sockets 59 and 66. 
     
  
Specified value: 3-200         If resistance is NOT OK:  
     
-  Disconnect 8-pin harness connector from throttle 
valve control module -J338-. 
    
-  Check wiring for open circuit between ECM/test box and 8-pin throttle 
valve control module harness connector. 
 
Connector terminal 1 to ECM/test box socket 66
 Connector terminal 2 to ECM/test box socket 59
 Connector terminal 7 to ECM/test box socket 67
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Page 20 of 38

 
Connector terminal 8 to ECM/test box socket 74
 Specified value: max. 1.5 
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