AUDI A4 1996 B5 / 1.G AFC Engine Multiport Fuel Injection And Ignition System Workshop Manual

28-1


Multiport Fuel Injection (MFI)
and ignition system Component overview

CAUTION!
Fire hazard! Do not smoke, work near heaters or
open flame, or have anything in the area that
could ignite fuel.
Not shown
- Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) -G130- (bank 1,
directly behind right-side three-way catalytic
converter)
- Oxygen Sensor (O2S) 2 behind Three Way
Catalytic Converter (TWC) -G131- (bank 2,
directly behind left-side three-way catalytic
converter)
Pa
ge 1 of 6 Multi
port Fuel In
jection
(MFI
) and i
gnition s
yste
m
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.1

28-2


1 -
Sensor for EVAP canister -G172-
2 -
Evaporative Emission (EVAP) canister
purge regulator valve -N80-
3 -
Fuel pressure regulator
4 -
Engine Coolant Temperature (ECT) sensor
-G62-
On coolant line behind cylinder head)
5 -
Ground connection On intake manifold
6 -
Harness connector 3-pinFor Knock Sensor (KS) 2 -G66-
7 -
Harness connector 4-pin, blackFor Heated Oxygen Sensor (HO2S) 2 -
G108- and Oxygen Sensor (O2S) 2 heater
-Z28- (bank 2)
8 -
Heated Oxygen Sensor (HO2S) 2 -G108- Bank 2
Pa
ge 2 of 6 Multi
port Fuel In
jection
(MFI
) and i
gnition s
yste
m
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.1

28-3


9 -
Harness connector
2-pin, blackFor EGR temperature sensor -G98-
10 -
Harness connector 3-pin, white, voltage supplyFor ignition coils 1, 2 and 3, -N-, -N128-
and -N158-
11 -
Crankshaft Position (CKP) sensor -G4- Timing reference mark on left side of
cylinder block
12 -
Knock Sensor (KS) 2 -G66-
13 -
Engine speed (RPM) sensor -G28-
14 -
Ignition coils 1, 2 and 3; -N-, -N128- and -
N158-
15 -
Fuel injectors
16 -
Knock Sensor (KS) 1 -G61-
17 -
Idle Air Control (IAC) valve -N71-
Pa
ge 3 of 6 Multi
port Fuel In
jection
(MFI
) and i
gnition s
yste
m
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.1

28-4


18 -
Harness connector
4-pin, greenFor Heated Oxygen Sensor (HO2S) behind
Three Way Catalytic Converter (TWC) -
G130- and Oxygen Sensor (O2S) heater -
Z29- (bank 1)
19 -
Harness connector 4-pin, brownFor Heated Oxygen Sensor (HO2S) 2
behind Three Way Catalytic Converter
(TWC) -G131- and Oxygen Sensor (O2S) 2
heater -Z30- (bank 2)
20 -
Harness connector 4-pin, blackFor Heated Oxygen Sensor (HO2S) -G39-
and Oxygen Sensor (O2S) heater -Z19-
(bank 1)
21 -
Harness connector 3-pinFor Knock Sensor (KS) 1 -G61-
Pa
ge 4 of 6 Multi
port Fuel In
jection
(MFI
) and i
gnition s
yste
m
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.1

28-5


22 -
Intake manifold change-over valve -N156-
23 -
Throttle Position (TP) sensor -G69-
With integral Closed Throttle Position
(CTP) switch -F60-
24 -
EGR temperature sensor -G98- On intake manifold under throttle body
25 -
EGR vacuum regulator solenoid valve -
N18-
26 -
Engine Control Module (ECM) -J192- In plenum in electronics box
Pa
ge 5 of 6 Multi
port Fuel In
jection
(MFI
) and i
gnition s
yste
m
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.1

28-6


27 -
Camshaft Position (CMP) sensor -G40-
28 -
Harness connector
3-pin, grayFor engine speed (RPM) sensor -G28-
29 -
Harness connector 3-pin, blackFor Crankshaft Position (CKP) sensor -G4-
(timing reference mark sensor)
30 -
Heated Oxygen Sensor (HO2S) -G39- Bank 1
31 -
Mass Air Flow (MAF) sensor -G70-
32 -
Ground connection Right engine mount
33 -
Power output stage -N122- For ignition coilsA: 4-pin signal wires from ECMB: 3-pin ignition coil primary connections
Pa
ge 6 of 6 Multi
port Fuel In
jection
(MFI
) and i
gnition s
yste
m
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.1