check engine AUDI A8 1997 D2 / 1.G ATQ Engine Electronic Engine Power Control Checking User Guide
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A8, Model: AUDI A8 1997 D2 / 1.GPages: 41, PDF Size: 0.21 MB
Page 15 of 41

24-144
      
Procedure  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for engine 
electronics using "address word" 01   Page 01
-
9 . 
     
   Ignition must remain switched on for this.Rapid data transfer  
HELP
Select function XX
    
When indicated on display:  
-  Press buttons -0- and -4- to select "Initiate basic setting" and press -Q- 
button to confirm input. 
Basic Settin
g 
Q
Input display group number XXX
    
When indicated on display:  
After pressing Q-button, throttle valve actuator will be switched on without 
current.  
In this condition, the throttle valve will be drawn into an emergency 
position by a mechanical spring, which is located in the throttle valve 
control module. The values supplied by the two angle sensors in this 
emergency position are stored by the Engine Control Module (ECM).  -  Press buttons -0-, -6- and -0- to select "display group number 060" and 
press -Q- button to confirm input. 
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Page 16 of 41

24-145
       Next, the throttle valve is opened by a certain 
value. If this value is reached, the throttle valve 
actuator is once again de-energized. Now, the 
mechanical spring must close the throttle valve to 
the previously learned emergency position within 
a specified time (spring test).  
      Then, the throttle valve is closed by the throttle 
valve actuator; the values supplied by the angle 
sensors in the throttle valve control unit are 
stored by the Engine Control Module (ECM).  
      If Engine Control Module (ECM) should de-
energize throttle valve actuator during driving 
operation, this is expressed by an increased, 
surging idle speed (RPM). The engine accepts 
gas only after great delay.  System in Basic Setting 60  
1 
2 
3 
4
    
When indicated on display:  
-  Check specified values for throttle valve control module in display fields 
3 and 4. 
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Page 19 of 41

24-147
      
Note:  
     The control module can abort adaptation for the 
following reasons: 
     
Throttle valve cannot be closed completely (e.g. 
contamination) 
     Battery voltage is too low.
     Throttle valve control module or wire connection 
is faulty. 
     Engine is started during adaptation or 
accelerator pedal is operated. 
     Tension of throttle valve housing (check 
bolts) 
     After termination, tester displays "Function is 
unknown or cannot be performed at the 
moment". The next time the ignition is switched 
on (several seconds), adaptation will be 
automatically repeated. 
     
-  End basic adjustment of the engine by pressing 
the  key. 
Rapid data transfer 
HELP
    
Indicated on display (function selection):  
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Page 22 of 41

24-149
       Angle sensor 1 for throttle drive (power 
accelerator actuation) -G187- and angle sensor 1 
for throttle drive (power accelerator actuation) -
G188- inform the Engine Control Module (ECM) 
about the position of the throttle valve. Both 
angle sensors are located in the throttle valve 
control module.  
     
Test sequence  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for engine 
electronics using "address word" 01   Page 01
-
9 . 
     
   Ignition must remain switched on for this.Rapid data transfer  
HELP
Select function XX
    
When indicated on display:  
-  Press buttons -0- and -8- to select "Read Measuring Value Block" and 
press -Q- button to confirm input. 
Read Measuring Value Block 
Q
Input displa
y group number XXX
    
When indicated on display:  
-  Press buttons -0-, -6- and -2- to select "display group number 062" and 
press -Q- button to confirm input. 
Read Measuring Value Block 62  
1 
2 
3 
4
    
Indicated on display:  
-  Check specified values for E-gas potentiometer voltages in display 
fields 1 and 2. 
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Page 23 of 41

24-150
 
  
Display fields  
  
1   2   3   4  
Display group 062: E-Gas potentiometer voltages  
Display  
xx %  
xx %   xx %   xx %  
Indicated  
Throttle valve angle  
(angle sensor 1)  Throttle valve angle  
(angle sensor 2)  Sensor for  
Pedal position  Sensor 2 for  
Pedal position  
Specified value  
3 to 93 %  
(Idle value: 
8 to 18 %)  97 to 3 %  
(Idle value: 
80 to 90 %)  12 to 97 %   4 to 49 %  
Specified value  
3 to 93 %  
97 to 3 %   12 to 97 %   4 to 49 %       
Note:  
     Engine Control Module (ECM) calculates the 
voltage values of the angle sensors in percent 
relative to 5 volts and displays these percentage 
values. (5 volts supply voltage represents 100 
%). 
     
-  Observe display field 1 and 2.
     
-  Slowly depress accelerator pedal completely.
      Percent indication in display field 1 must rise 
uniformly. The tolerance range of 3 to 93% will 
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Page 26 of 41

24-152
      
Check voltage supply throttle valve control 
module  
     
-  Pull connector (2) off throttle valve control 
module. 
     
-  Switch ignition on.
    
If specified values are not obtained:  
Check wire connections from Engine Control Module (ECM) to throttle 
valve control module   Page 24
-153
 .   -  Connect multimeter to the following connector terminals for voltage 
measurement: 
Harness connector  
Terminal  
Specified value  
2 + Ground (GND)   about 5 V  
2 + 6   about 5 V  
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Page 29 of 41

24-155
       Both the Throttle Position (TP) sensor -G79- and 
the Sender -2- for accelerator pedal position -
G185- are located at the accelerator pedal and 
communicate the driver's intentions to the ECM 
completely independently of each other. Both 
sensors are stored in one housing.  
     
Test sequence  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for engine 
electronics using "address word" 01   Page 01
-
9 . 
     
   Ignition must remain switched on for this.Rapid data transfer  
HELP
Select function XX
    
When indicated on display:  
-  Press buttons -0- and -8- to select "Read Measuring Value Block" and 
press -Q- button to confirm input. 
Read Measurin
g Value Block 
Q
Input display group number XXX
    
When indicated on display:  
-  Press buttons -0-, -6- and -2- to select "display group number 062" and 
press -Q- button to confirm input. 
Read Measuring Value Block 62  
1 
2 
3 
4
    
Indicated on display:  
-  Check specified values for E-gas potentiometer voltages in display 
fields 3 and 4. 
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power control 
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Page 30 of 41

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Display fields  
  
1   2   3   4  
Display group 062: E-Gas potentiometer voltages  
Display   xx %   xx %  
xx %  
xx %  
Indicated  Throttle valve angle  
(angle sensor 1)  Throttle valve angle  
(angle sensor 2)  Sensor for  
Pedal position  Sensor 2 for  
Pedal position  
Functional range   0 to 100 %   0 to 100 %  
0 to 100 %  
0 to 50 %  
Specified value   3 to 93 %   97 to 3 %  
12 to 97 %  
(Idle value: 8 to 18 %)  4 to 49 %  
(Idle value: 3 to 13 %)       
Note:  
     Engine Control Module (ECM) calculates the 
voltage values of the angle sensors in percent 
relative to 5 volts and displays these percentage 
values. (5 volts supply voltage represents 100 
%). 
     
-  Observe display field 3 and 4.
     
-  Slowly depress accelerator pedal completely.
      Percent indication in display field 3 must rise 
uniformly. The tolerance range 12 to 97% is not 
used completely during this.  
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Page 34 of 41

If specified values are not obtained:  -  Also check signal wires. 
-  Check wire connections from Engine Control Module (ECM) to sensors 
for accelerator pedal position. 
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Page 37 of 41

24-161
      
Kick down function, adapting
 
      If the sensor for accelerator pedal position or the 
Engine Control Module (ECM) is replaced on a 
vehicle with automatic/variable transmission, the 
kick down function must be learned by the ECM.  
     
Special Tools and Equipment  
    
Requirements 
Procedure  
VAS5051 with VAG5051/1
   orVAG1551 with VAG1551/3BNo DTCs in DTC memory, check DTC memory   Page 01
-15
 . 
Engine not running, ignition switched on. 
-  Connect VAS5051 tester or VAG1551 scan tool and select the control 
module for engine electronics using "address word" 01   Page 01
-9 . 
   Ignition must remain switched on for this.
Pa
ge 37 of 41 Electronic en
gine 
power control 
(E-Gas
), checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.24.5