AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual A4 1999 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1053/w960_1053-0.png AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual

Page 1 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-1
 
     
Motronic Multiport Fuel 
Injection (MFI) system, 
servicing 
     
Safety precautions
 
     
Observe following precautions if test and 
measuring instruments are required during a 
road

Page 2 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual      
Fire hazard! Do not smoke, work near 
heaters or open flame, or have anything 
nearby that could ignite fuel. The fuel system 
is pressurized. Before loosening hose 
connections or opening the t

Page 3 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-2
      
CAUTION! 
     
To operate the engine at starter speed 
without actually starting it (for example, in 
order to test compression), unplug the 
connectors from the output stages for the 
ig

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AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual disconnected, when: 
     
Working on the electrical system.
     
When connecting and disconnecting 
electrical test equipment (LED voltage tester, 
multimeter, etc.): 
     Be sure the ignition is s

Page 5 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-3
      
Rules for cleanliness
 
     
When working on the fuel supply/injection 
system, pay careful attention to the 6 
following rules for cleanliness:  
     
Thoroughly clean all connections a

Page 6 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-4
 Technical data
 
Engine identification  
  
APB  
Idling speed  
Not adjustable - controlled by Idle Air Control (IAT)    
    
750 - 850 RPM  
Engine speed (RPM) limitation  
via fuel injector

Page 7 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-5
 
  
Component locations, overview
 
Components A to I are not shown in the exploded 
drawing.  
A - Brake Light Switch -F- and Brake Pedal 
Switch -F47- 
In footwell on pedal bracket near brake

Page 8 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-6
 
  
 Repair Manual, Fuel Supply System, Repair 
Group 20, Components of EVAP system servicing
    F - Electronic Power Control (EPC) 
warning light 
In instrument cluster (Significance of light

Page 9 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-7
 
  
1 - 
Harness connector forOxygen Sensor 
(O2S) Behind Three Way Catalytic 
Converter (TWC) -G130 and Heater for 
Lambda-probe 1 -Z29 
4-pin green
2 - 
Harness connector forOxygen Sensor 
(O2

Page 10 of 90

AUDI A4 1999 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual 24-8
 
  
8 - 
Sensor -1- for exhaust temperature -G235 
At rear of intake manifold on the left-hand 
side (looking from the front of the engine 
compartment) On vehicles with automatic 
transmission
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