display AUDI A8 2000 D2 / 1.G AHA Engine Throttle Valve Control Module Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 2000, Model line: A8, Model: AUDI A8 2000 D2 / 1.GPages: 36, PDF Size: 0.12 MB
Page 7 of 36

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 display group number XXX
    
Indicated on display  
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Page 8 of 36

24-133
      
-  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)  
-  Check Closed Throttle Position (CTP) switch (display field 4):
  
Display fields  
  
1   2   3   4  
Display group 5: Engine electronics  
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   Operational condition  
Range   0 - 6800 RPM   0.00 - 12.75 ms   ---   ---  
Specified value   620 - 740 RPM  
(all-wheel drive)  1.00 - 2.50 ms   0 km/h   Throttle closed: "Idle"  
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Page 9 of 36

740 - 860 RPM  
(front-wheel drive)  
           Throttle slightly open: "Part throt"  
  
---   ---   ---   If display is NOT OK   page 24
-134
 , Continuation  
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Page 13 of 36

24-137
      
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 -5- to input display group number 55 (055), 
and press -Q- button to confirm input. 
Read Measuring Value Block 55 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
-  Compare display with specified values for idle air control (display fields 
1-4): 
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Page 14 of 36

24-138
 
  
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   -2.78 to +2.85 g/s   -1.67 to +3.34 g/s   ---  
Specified 
value  620 - 740 RPM  
(all-wheel drive)  
or  
740 - 860 RPM  
(front-wheel drive)  -1.39 to +1.39 g/s   -1.39 to +1.39 g/s   0000  
(all-wheel drive)  
and/or  
0100  
(front-wheel 
drive)  
  
If engine speed is NOT OK   page 
24
-141
 , Continuation  
If display is NOT OK   page 24
-139
 , Evaluation of 
display group 55  
Explanation   
 page 24
-140
 
  
      If displayed values are OK:  
     
- 
Press  button.
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Page 16 of 36

24-139
 Evaluation of display group 55  Display group: 
55  
  
  
Display fields: 
2  3  
Possible malfunction cause  
Corrective action  
above 1.39 g/s  
 
Increased load because of switched-
on consumers - Switch off electrical consumers
  
 Throttle valve mechanism sticking
 Air passage in area of throttle valve 
contaminated - Visually check, repair if necessary
below -1.39 g/s  
 Intake air leak (false air) behind 
throttle valve - Check intake air system for leaks (false air)   page 24
-126
- Check exhaust system   Repair Manual, 2.8 Liter V6 5V 
General, Engine, Repair Group 26 
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Page 17 of 36

24-140
 Explanation of 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         Idle air control boost (0 = no idle air control boost, for all-wheel drive vehicles; 1 = idle air control boost, for 
front-wheel drive vehicles)  
0            always "0"  
Note:  
The increased idle speed (raised rpm) on vehicles with front-wheel drive is attained if there is power supplied (B+, 15er) to 
terminal 10 of the engine control module. 
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Page 22 of 36

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 display group number XXX
    
Indicated on display  
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Page 23 of 36

24-144
      
-  Press buttons -0-, -0- and -3- to input display 
group number 3 (003), and press -Q- button to 
confirm input. Read Measuring Value Block 3 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
-  Compare display with specified values for throttle angle, (display field 
3): 
  
Display fields  
  
1   2   3   4  
Display group 3: Load measurement  
Display   xxx RPM   xx.x g/s  
xxx   
xx.x  BTDC  
Indicates   Engine speed  
(in 40 RPM 
steps)  Mass air 
flow  Throttle angle   Ignition timing  
Range   0 - 6800 RPM   ---  
0 - 90    
0.0 - 50.0 
BTDC  
Specified 
value  0 RPM   ---  
0 - 5    
0.0   
  
---   ---   If not as specified   page 24
-146
 , Evaluation of 
display group 3  
---  
- 
Open throttle valve slowly while monitoring degree ( ) value in display field 3.    Value must increase uniformly over the entire range.
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Page 25 of 36

24-145
      
-  Press buttons -0- and -6- to select "End Output" 
function 06, and press -Q- button to confirm 
input. 
     
-  Switch ignition off.
     
Note:  
     The values displayed in display field 3 depend on 
the calibration of the Throttle Position (TP) 
sensor and do not correspond with the actual 
throttle valve opening in degrees. The maximum 
displayed value is 90.0  .       If the throttle angle value does not increase 
uniformly:  
     
-  Replace throttle valve control module -J338-.
     
-  Carry out adaptation of throttle valve control 
module to ECM   page 24
-150
 . 
     
- Check readiness code   page 01
-70
 . If 
Diagnostic Trouble Code (DTC) memory has 
been erased, or ECM was disconnected, 
generate new readiness code   page 01
-73
 . 
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