check engine AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual A6 1998 C5 / 2.G AUDI AUDI https://www.carmanualsonline.info/img/6/1062/w960_1062-0.png AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual

Page 1 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-1
 
     
Ignition system, checking 
     
General notes on ignition system
 
     
The battery should only be disconnected and 
reconnected when the ignition is turned off, 
since otherwise the En

Page 2 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-2
      
Safety precautions
 
      To reduce the risk of personal injury and/or 
damage to the fuel injection and ignition system, 
always observe the following:  
     
Do not touch or pull off i

Page 3 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual      
The battery should only be disconnected and 
reconnected when the ignition is turned off, 
since otherwise the Engine Control Module 
(ECM) can be damaged. 
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Page 4 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 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 wh

Page 13 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-11
      
Checking voltage supply to ignition coils  
     
Note:  
     Voltage is supplied to ignition coils via Fuel 
Pump (FP) relay. 
     
Test requirement:  
     
Fuse for ignition coils OK

Page 15 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-12
      
Checking activation  
     
-  Disconnect connectors from all six fuel injectors. 
(afterward check DTC memory) 
    
If specified values are not obtained:  -  Connect VAG1527B voltage te

Page 16 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-13
 
    
If no malfunctions are found in wires:  -  Check the following wire connections for open circuit and short circuit 
to Ground (GND) and B+: Harness connector  
Terminal  
VAG1598/31 test

Page 18 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-15
       Component location   Overview of Component 
Locations, page   Page 24
-5   
     
Test sequence  
     
-  Connect VAS5051 tester or VAG1551 scan tool 
and select the control module for e

Page 19 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-16
 
  
Display fields  
  
1   2   3   4  
Display group 004: Intake Air Temperature (IAT), engine at idle  
Display   xxxx/min   xx.xxx volts  
xxx.x C  
xxx.x C  
Indicated  Engine speed 
(RPM)

Page 22 of 65

AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual 28-19
 
  
Engine speed (RPM) sensor -G28-, 
checking
 
Special Tools and Equipment  
 
VAG1526A
 VAG1594A
 VAG1598/31
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