ESP 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 9 of 65

28-8
       Component location   Overview of Component 
Locations, page   Page 24
-5   
     
Notes:  
     
Ignition coils and power output stage are a 
common part. 
     Primary resistance of ignition coils cannot be 
measured. 
     Secondary resistance must first be measured 
with the ignition wires connected to the ignition 
coils via the spark plug connectors of the 
corresponding cylinder (This measurement will 
include measurement of the shielded 
resistances of the ignition wires). 
     
-  Disconnect 5-pin connector from ignition coils.
     
Check ignition coils (-N-, -N128- and -N158-)  
     
-  Pull the ignition wires from the spark plugs.
    
-  In order to perform a resistance measurement, connect multimeter 
between both spark plug connectors of the respective ignition circuit to 
be checked. 
 
Specification: each 16 to 27 k
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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 51 of 65

28-46
       Component location   Overview of Component 
Locations, page   Page 24
-5   
     
Notes:  
     
Camshaft Position (CMP) Sensor -G40- is 
located at rear of left cylinder block (bank 2). 
     Camshaft Position (CMP) Sensor 2 -G163- is 
located at front of right cylinder block (bank 1). 
     
Checking activation  
     
-  Slide back rubber grommet at connector of the 
respective Camshaft Position (CMP) Sensor 
(connector remains connected to Camshaft 
Position (CMP) Sensor). 
    
Note:  
Connector socket numbers are shown on the rear side of the connector.  -  Connect VAG1527B voltage tester between sockets 2 (CMP sensor 
signal) and 1 (B+). 
-  Operate starter for a few seconds.
 
LED must blink briefly at every second engine rotation.
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Page 52 of 65

28-47
      
Note:  
     Voltage testers do not go out completely during 
low current pick-up between activations by the 
ECM, but rather continue to glow a little and then 
get significantly brighter during activation. 
      If LED does not blink:  
     
Checking voltage supply  
     
-  Disconnect connector at respective Camshaft 
Position (CMP) sensor. 
     
-  Switch ignition on.
    
-  Connect multimeter for voltage measurement as follows:Harness connector  
Terminal  
Measure to  
1   Engine Ground (GND)  
 
Specification: about 5 V
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Page 53 of 65

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Checking signal wire  
    
Checking Ground (GND) wire  
If all specified values are being reached and the LED does not blink 
(measured between terminal 1 and 2 with starter and connector 
connected):  -  Connect multimeter for voltage measurement as follows:Harness connector  
Terminal  
Measure to  
2   Engine Ground (GND)  
 
Specification: approx. battery voltage
-  Connect multimeter for voltage measurement as follows:
Harness connector  
Terminal  
Measure to  
3   B+  
 
Specification: approx. battery voltage
-  Repair open circuit or short circuit if necessary.
-  Replace respective Camshaft Position (CMP) sensor.
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