AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual A4 1999 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1045/w960_1045-0.png AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

Page 111 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-86
 
    
If wiring is OK:  -  Check wiring for short circuit between ECM/test box and 2-pin harness 
connector according to wiring diagram. 
 
Connector terminal 1 to vehicle Ground
 Connector ter

Page 112 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-87
      
Continuation of test  
      (when IAT sensor indicates approx. ambient 
temperature)  
     
-  Without disconnecting harness connector, 
remove IAT sensor -G42-. 
     
-  Monitor intak

Page 113 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-88
      
Engine Speed (RPM) sensor, checking
 
     
Note:  
     Component locations   page 24
-1  
     
Required special tools and test equipment  
     
VAG1598/22 test box 
     Multimeter US

Page 114 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-89
 
    
If wiring is OK:  -  Check wiring for open circuit between ECM/test box and 3-pin harness 
connector. 
 
Connector terminal 1 to ECM/test box socket 67
 Connector terminal 2 to ECM/test b

Page 115 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-90
      
Voltage supply to Engine Control 
Module (ECM), checking
 
     
Required special tools and test equipment  
     
VAG1551 or VAG1552 Scan Tool (ST) with 
VAG1551/3 adapter cable 
     VA

Page 116 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual Read Measurin
g Value Block 
HELP
Input display group number XXX
    
Indicated on display  
-  Press buttons -0-, -0- and -4- to input display group number 4 (004), 
and press -Q- button to confirm i

Page 117 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-91
      
-  Check battery positive voltage (B+) in display 
field 2. 
  
Display fields  
  
1   2   3   4  
Display group 4: General engine data  
Display   xxx RPM   xx.xxx V  
xxx.x C  
xxx.x C

Page 118 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-92
 Evaluation of display group 4  Display group: 4  
  
  
Display field: 2  
Possible malfunction 
cause  
Corrective action  
If "Control module does not answer" is 
displayed  
Fuse for ECM fau

Page 119 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-93
      
Checking voltage supply at terminal 30  
     
-  Switch ignition off.
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 . 
     
-  Connect multimeter US1119 (

Page 120 of 166

AUDI A4 1999 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-94
      
Checking voltage supply at terminal 15  
     
-  Switch ignition off.
     
-  Connect VAG1598/22 test box to ECM harness 
connector  page 01
-67
 . 
     
-  Connect multimeter between