sensor AUDI A8 1999 D2 / 1.G ATQ Engine Ignition System Checking User Guide
[x] Cancel search | Manufacturer: AUDI, Model Year: 1999, Model line: A8, Model: AUDI A8 1999 D2 / 1.GPages: 65, PDF Size: 0.53 MB
Page 29 of 65

28-26
      
Coolant temperature sensor with square 
connector: 
    
Coolant temperature sensor with oval connector:  -  Connect multimeter between terminal 1 and 3 of connector for 
resistance measurement. 
    
-  Connect multimeter between terminal 3 and 4 of connector for 
resistance measurement. 
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Page 30 of 65

28-27
      
All models 
      Range A shows the resistance values for the 
temperature range from 0-50  C, and range B 
shows the values for the temperature range from 
50-100 C.  
    
Read-out examples:  
If specified value is not obtained:  
If specified value is obtained:  
30  C corresponds to a resistance of 1500 to 2000 80  C corresponds to a resistance of 275 to 375 
-  Replace coolant temperature sensor.
-  Connect VAG1598/31 test box at wiring harness to ECM, do not 
connect ECM   Page 24
-17
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Page 31 of 65

28-28
      
Coolant temperature sensor with square 
connector: 
    
Coolant temperature sensor with oval connector:  -  Check the following wire connections for open circuit and short circuit 
to Ground (GND) and B+: Harness connector  
Terminal  
VAG1598/31 test box  
Socket  
1 (signal)   93  
3   108  
    
-  Check the following wire connections for open circuit and short circuit 
to Ground (GND) and B+: Harness connector  
Terminal  
VAG1598/31 test box  
Socket  
3   108  
4 (signal)   93  
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Page 38 of 65

28-33
      
Knock recognition control stop, 
checking
 
      The following tests must be performed when a 
DTC is stored that relates to "knock recognition 
control limit reached".  
  
Possible cause  
Corrective action  
DTC for all cylinders  
Poor fuel quality- Change fuel quality  
(see operating instructions)
or  
DTC for all cylinders in one 
row  Knock sensor tightened to incorrect 
torque - Loosen knock sensors and tighten to 20 
Nm 
  Knock sensor faulty- Check knock sensors   Page 28
-41
  
Corrosion at harness connector  
  Engine accessories loose- Secure engine accessories
DTC for one Cylinder  Engine damage- Check compression pressure
  Engine accessories loose- Secure engine accessories
     
-  Also check ignition angle retardation of the 
individual cylinders   Page 28
-34
 . 
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Page 40 of 65

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Display fields  
  
1   2   3   4  
Display group 020: Ignition -knock control in driving operation  
Display  
xx.x  KW  
xx.x  KW  
xx.x  KW  
xx.x  KW  
Indicated  
Ignition angle 
retardation cylinder 1 
via knock control 
Knock sensor control  Ignition angle 
retardation cylinder 2 
via knock control 
Knock sensor control  Ignition angle 
retardation cylinder 3 
via knock control 
Knock sensor control  Ignition angle 
retardation cylinder 4 
via knock control 
Knock sensor control  
Specified 
value  0 to 12  KW  
0 to 12  KW  
0 to 12  KW  
0 to 12  KW  
Notes  Evaluation  Page 28
-40
   
Note:  
The number values indicated in display fields 1 to 4 represent actual ignition angle retardation via knock control of the 
individual cylinders. Ignition angle retardation occurs in  KW (crankshaft degrees) toward retardation.      
- Press -C- button.Read Measuring Value Block 
Q
Input display group number XXX
    
When indicated on display:  
-  Press buttons -0-, -2- and -1- to select "display group number 021" and press -
Q- button to confirm input. 
Read Measuring Value Block 21  
1 
2 
3 
4
    
When indicated on display:  
-  Check indication in display field 1 and 2.
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Page 41 of 65

28-36
 
  
Display fields  
  
1   2   3   4  
Display group 021: Ignition -knock control in driving operation  
Display  
xx.x  KW  
xx.x  KW  
  
  
Indicated  
Ignition angle retardation cylinder 5 via 
knock control 
Knock sensor control  Ignition angle retardation cylinder 6 via 
knock control 
Knock sensor control    
  
Specified 
value  0 to 12  KW  
0 to 12  KW  
  
  
Notes  Evaluation  Page 28
-40
   
  
  
Note:  
The number values indicated in display fields 1 and 2 represent actual ignition angle retardation via knock control of the 
individual cylinders. Ignition angle retardation occurs in  KW (crankshaft degrees) toward retardation.      
- Press -C- button.Read Measurin
g Value Block 
Q
Input displa
y group number XXX
    
When indicated on display:  
-  Press buttons -0-, -2- and -2- to select "display group number 022" and press -Q-
button to confirm input. 
Read Measuring Value Block 22  
1 
2 
3 
4
    
When indicated on display:  
-  Check indications in display field 3 and 4.
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Page 42 of 65

28-37
 
  
Display fields  
  
1   2   3   4  
Display group 022: Ignition -knock control in driving operation  
Display   xxxx/min   xxx.x %  
xx.x  KW  
xx.x  KW  
Indicated  Engine speed 
(RPM)  Engine 
load  Ignition angle retardation cylinder 1 
via knock control 
Knock sensor control  Ignition angle retardation cylinder 2 
via knock control 
Knock sensor control  
Specified 
value  xxxx/min   12 to 100 
%  0 to 12  KW  
0 to 12  KW  
Notes        Evaluation  Page 28
-40
   
Note:  
The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders 
1 and 2. Ignition angle retardation occurs in  KW (crankshaft degrees) toward retardation.      
- Press -C- button.Read Measurin
g Value Block 
Q
Input displa
y group number XXX
    
When indicated on display:  
-  Press buttons -0-, -2- and -3- to select "display group number 023" and press -Q-
button to confirm input. 
Read Measuring Value Block 23  
1 
2 
3 
4
    
When indicated on display:  
-  Check indications in display field 3 and 4.
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Page 43 of 65

28-38
 
  
Display fields  
  
1   2   3   4  
Display group 023: Ignition -knock control in driving operation  
Display   xxxx/min   xxx.x %  
xx.x  KW  
xx.x  KW  
Indicated  Engine speed 
(RPM)  Engine 
load  Ignition angle retardation cylinder 3 
via knock control 
Knock sensor control  Ignition angle retardation cylinder 4 
via knock control 
Knock sensor control  
Specified 
value  xxxx/min   12 to 100 
%  0 to 12  KW  
0 to 12  KW  
Notes        Evaluation  Page 28
-40
   
Note:  
The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders 
3 and 4. Ignition angle retardation occurs in  KW (crankshaft degrees) toward retardation.      
- Press -C- button.Read Measurin
g Value Block 
Q
Input displa
y group number XXX
    
When indicated on display:  
-  Press buttons -0-, -2- and -4- to select "display group number 024" and press -Q-
button to confirm input. 
Read Measuring Value Block 24  
1 
2 
3 
4
    
When indicated on display:  
-  Check indications in display field 3 and 4.
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Page 44 of 65

28-39
 
  
Display fields  
  
1   2   3   4  
Display group 024: Ignition -knock control in driving operation  
Display   xxxx/min   xxx.x %  
xx.x  KW  
xx.x  KW  
Indicated  Engine speed 
(RPM)  Engine 
load  Ignition angle retardation cylinder 5 
via knock control 
Knock sensor control  Ignition angle retardation cylinder 6 
via knock control 
Knock sensor control  
Specified 
value  xxxx/min   12 to 100 
%  0 to 12  KW  
0 to 12  KW  
Notes        Evaluation  Page 28
-40
   
Note:  
The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders 
5 and 6. Ignition angle retardation occurs in  KW (crankshaft degrees) toward retardation. 
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Page 45 of 65

28-40
 Evaluation display groups 020/021/022/023/024 - ignition angle retardation  
Indicated on display  
Possible cause  
Corrective action  
All cylinders more than 12  KW  
Knock sensor faulty- Check knock sensor   Page 28
-41
  
Harness connector corroded  
  Knock sensor incorrect 
tightening torque - Loosen knock sensors and tighten to 20 
Nm 
  Engine accessories loose- Secure engine accessories
  Poor fuel quality- Change fuel quality  
(see operating instructions)
One cylinder deviates significantly from 
the others  Harness connector corroded- Check knock sensor   Page 28
-41
  
Engine damage
 Repair Manual, Engine Mechanical, 
Repair Group 15  - Check compression pressure:
  
Engine accessories loose- Secure engine accessories
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