torque AUDI A8 1999 D2 / 1.G ATQ Engine Ignition System Checking Workshop Manual
[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 4 of 65

28-3
 Technical data, ignition
 
Engine identification  
ATQ (2.8 L / 5V/ 147 kW-engine)  
Idle speed  
Engine speed cannot be adjusted, it is regulated by idle stabilization  720 to 820 RPM (front wheel drive)  
630 to 730 RPM (all wheel drive)  
Engine speed (RPM) limitation  
via fuel injector shut-off    
about 6800 RPM  
Ignition timing is determined in the control module  
It is not possible to adjust the ignition timing    
Ignition system   Dual-spark ignition system with three ignition coils  
Spark plugs   Tightening torque 30 Nm.  
Firing sequence   1-4-3-6-2-5  
Pa
ge 4 of 65 I
gnition s
ystem, 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.FU05.28.1 
Page 6 of 65

28-5
 
  
7 - 
5-pin harness connector 
Black
8 - 
3-pin harness connector Terminals are gold-plated
9 - 
20 Nm Tightening torque affects function of Knock 
Sensor (KS) 
10 - 
Knock Sensor (KS) 2 -G66- Bank 2Terminals of sensor and connector are 
gold-plated 
11 - 
Knock Sensor (KS) 1 -G61- Bank 1Terminals of sensor and connector are 
gold-plated 
12 - 
10 Nm 
Pa
ge 6 of 65 I
gnition s
ystem, 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.FU05.28.1 
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
 . 
Pa
ge 38 of 65 I
gnition s
ystem, 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.FU05.28.1 
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
Pa
ge 45 of 65 I
gnition s
ystem, 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.FU05.28.1 
Page 47 of 65

28-42
       Component location   Overview of Component 
Locations, page   Page 24
-5   
     
Notes:  
     
Knock Sensor (KS) 1 -G61- and Knock Sensor 
(KS) 2 -G66- themselves cannot be electrically 
tested. 
     Use only gold-plated terminals when servicing 
harness connector for knock sensors. 
     For the knock sensors to function properly, it is 
important that tightening torque be exactly 20 
Nm. 
     Check harness connector from knock sensor to 
wiring harness for corrosion. 
     
Check knock sensors  
    
Note:  
Coolant reservoir screws must be removed and coolant reservoir must be 
placed to side in order to access harness connector for knock sensor for 
bank 2. The coolant hoses can remain connected.  -  Disconnect the harness connector of the relevant knock sensor in 
engine compartment. 
Pa
ge 47 of 65 I
gnition s
ystem, 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.FU05.28.1