AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual https://www.carmanualsonline.info/img/6/1045/w960_1045-0.png AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

Page 131 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual Fuse for fuel injectors OK 
     Engine speed (RPM) sensor OK 
     Fuel pump relay OK 
Pa
ge 131 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:

Page 132 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-103
      
Checking signal from ECM  
    
-  Disconnect harness connector from cylinder 1 fuel injector.
-  Connect VAG1527B LED voltage tester between connector terminals 
(to ECM), using adapter

Page 133 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-104
       If LED does not flicker:  
     
-  Switch ignition off.
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 . 
     
-  Check wiring for open circuits between E

Page 134 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual      
 
Specified value: max. 1.5 
Pa
ge 134 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair

Page 135 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-105
      
-  Check wiring for open circuit between fuel 
injector connector terminal 1 and relay panel, 
according to wiring diagram. 
     
  
Specified value: max. 15      
-  Check wiring for s

Page 136 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-106
      
Fuel injectors, checking for leakage
 
     
WARNING! 
     
Fire hazard! Do not smoke, work near heaters 
or open flame, or have anything nearby that 
could ignite fuel. The fuel system

Page 137 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-107
      
Checking  
     
-  Remove intake air hose between MAF sensor 
and intake air noise muffler. 
     
-  Remove vacuum hose from Intake Manifold 
Tuning (IMT) valve -N156- (change-over val

Page 138 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-108
      
Checking injection amount  
    
-  Insert injector to be tested into measuring glass of VAG1602 fuel 
analyzer. 
-  Connect one terminal of injector being tested to engine ground using

Page 139 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-109
      
-  Operate remote VAG1348/3A 30 seconds.
     
Note:  
     The spray pattern must be the same for all 
valves. 
      Once all three injectors in a single bank have 
been checked:

Page 140 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-110
      
Checking for leaks  
     
-  Conduct output DTM, actuating cylinder 1 
injector -N30-   page 01
-51
 (fuel pump must be 
running). 
     
Note:  
     This step lets the fuel pump run w