check engine AUDI A4 1995 B5 / 1.G AEB Engine Throttle Valve Control Module And Checking
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Page 2 of 38

24-100
      
Function
 
      Idle speed stabilization is integrated in the 
throttle valve control module -J338-. In the 
housing opposite the throttle valve are Throttle 
Position (TP) sensor -G69-, Closed Throttle 
Position (CTP) switch -F60-, throttle drive -G186- 
and angle sensor -1- for throttle drive -G187-.  
     
The housing should not be opened. 
      The individual components cannot be replaced or 
mechanically adjusted. All adjustments are 
accomplished by the VAG 1551 Scan Tool (ST) 
using the "Basic Setting" function 04.  
      If the complete throttle valve control module is 
without power (i.e. disconnected), the throttle 
valve assumes a mechanical closed throttle 
position that results in an increased idle speed of 
1200-1300 RPM (with engine at operating 
temperature).  
      If only the Throttle Position (TP) actuator -V60- is 
without power, the throttle valve also assumes a 
mechanical closed throttle position (limp-home 
position), but because the signal from the CTP 
switch -F60- can still be recognized, a nearly 
"normal" idle speed of approx. 900 RPM is 
maintained with a corresponding reduction of the 
ignition timing advance.  
      If the Engine Control Module (ECM) recognizes a 
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Page 5 of 38

24-102
      
-  Check wiring for short circuit between ECM/test 
box and 8-pin harness connector. 
     
 
Connector terminal 7 to ECM/test box 
socket 69 
     
 Connector terminal 7 to ECM/test box 
socket 62 
     
 Connector terminal 4 to ECM/test box 
socket 67 
     
 Specified value: 
     
-  Reconnect throttle valve control module harness 
connector. 
      If wiring is OK:  
     
-  Replace Motronic Engine Control Module (ECM) 
-J220-  Page 01
-57
 . 
     
-  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, 
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Page 7 of 38

24-103
      
Closed Throttle Position (CTP) switch, 
checking
 
     
Note:  
     The Closed Throttle Position (CTP) switch -F60- 
is inside 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
 
     
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 . 
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Page 9 of 38

24-104
      
-  Press buttons -0-, -0- and -5- to input display 
group number 5, 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   0.00-8.50 ms   ---   ---  
Specified value   760-960 RPM   0.50-1.50 ms   0 km/h   Throttle closed: "Idle"  
           Throttle slightly open: "Part throt"  
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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

24-109
      
-  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 23 of 38

24-113
      
Throttle Position (TP) sensor, checking
 
     
Note:  
     Throttle Position (TP) sensor -G69- is located 
inside 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
 
     
Checking  
     
-  Connect VAG 1551 or VAG 1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with ignition 
switched; engine not running)   Page 01
-7 . 
Rapid data transfer 
HELP
    
Indicated on display  
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Page 25 of 38

24-114
      
-  Press buttons -0-, -0- and -3- to input display 
group number 3, 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
-115
 , Evaluating 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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