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

24-1


Motronic Multiport Fuel
Injection (MFI) and ignition
system Component locations

Data Link Connector (DLC)
Fuel pump relay
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) -G130-, with Oxygen
Sensor (O2S) heater -Z29-
Located under knee bar, left side of steering
wheel
Position 6 on relay panel in driver's side footwell
Bank 1, sensor 2
In exhaust system behind TWC
Pa
ge 1 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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24-2


Oxygen Sensor (O2S) 2 behind Three Way
Catalytic Converter (TWC) -G131-, with Oxygen
Sensor (O2S) heater -Z30-
EVAP system Leak Detection Pump (LDP) -
V144-
Bank 2, sensor 2
In exhaust system behind TWC
In left-rear wheelhousing behind splash shield
Pa
ge 2 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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24-3


1 -
Harness connector
For O2S behind TWC -G130- and O2S
heater -Z29- 4-pin connector, greenFor bank 1, sensor 2
2 -
Harness connector For O2S 2 behind TWC -G131- and O2S 2
heater -Z30- 4-pin connector, brownFor bank 2, sensor 2
3 -
Harness connector For HO2S -G39- with O2S heater -Z19-4-pin connector, blackFor bank 1, sensor 1
4 -
Harness connector For Knock Sensor (KS) 1 -G61-3-pin connector, blue
5 -
Secondary Air Injection (AIR) solenoid
valve -N112-
Pa
ge 3 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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24-4


6 -
Intake Air Temperature (IAT) sensor -G42-
7 -
Harness connector
For HO2S 2 -G108- with O2S heater -Z28-4-pin connector, blackFor bank 2, sensor 1
8 -
Harness connector For Knock Sensor (KS) 2 -G66-3-pin connector, blue
9 -
Harness connector For engine speed (RPM) sensor -G28-3-pin connector, gray
10 -
Electronics box (E-box)
Contains:Motronic Engine Control Module (ECM) -
J220- Secondary Air Injection (AIR) pump relay -
J299-
Pa
ge 4 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&id=AUDI.B5.FU03.24.1

24-5


11 -
Valve 2 for camshaft adjustment -N208-
12 -
Camshaft Position (CMP) sensor -G163-,
bank 1
13 -
Heated Oxygen Sensor (HO2S) -G39- with
Oxygen Sensor (O2S) heater -Z19-
Bank 1, sensor 1
14 -
Ground (GND) connection To right engine support
15 -
Mass Air Flow (MAF) sensor -G70-
Pa
ge 5 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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yp
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24-6


16 -
EVAP canister purge regulator valve -N80-
17 -
Engine Coolant Temperature (ECT) sensor
-G62-
4-pin connectorIn coolant pipe behind right cylinder head
(Bank 1)
18 -
Throttle valve control module -J338-
Includes:Throttle drive -G186-Angle sensor 1 for throttle drive -G187-Throttle Position (TP) sensor -G69-Closed Throttle Position (CTP) switch -
F60-
19 -
Intake Manifold Tuning (IMT) valve -N156-
(change-over valve)
20 -
Fuel pressure regulator
Pa
ge 6 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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24-7


21 -
Engine speed (RPM) sensor -G28-
In transmission housing above differential
22 -
Camshaft Position (CMP) sensor -G40-,
bank 2
23 -
Heated Oxygen Sensor (HO2S) 2 -G108-
with Oxygen Sensor (O2S) heater -Z28- Bank 2, sensor 1
24 -
Knock Sensor (KS) 2 -G66-
25 -
Ignition coils and power output stage
Includes:Ignition coil -N-Ignition coil 2 -N128-Ignition coil 3 -N158-Power output stage -N122-
Pa
ge 7 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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24-8


26 -
Knock Sensor (KS) 1 -G61-
27 -
Fuel injectors
Cylinder 1: -N30-Cylinder 2: -N31-Cylinder 3: -N32-Cylinder 4: -N33-Cylinder 5: -N83-Cylinder 6: -N84-
28 -
Valve 1 for camshaft adjustment -N205-
29 -
Secondary Air Injection (AIR) pump motor
-V101-
Pa
ge 8 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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24-14

Fuel injection system, servicing

Servicing ignition system page 28
-1

Notes:

Fuel hoses in the engine compartment must be
secured with spring-type clamps. Screw-type
clamps or equivalent must not be used.
The Engine Control Module (ECM) has On
Board Diagnostic (OBD) capability, and is
equipped with Diagnostic Trouble Code (DTC)
memory. Before repairing or adjusting any
components or systems, first check DTC
memory. Also check all vacuum connections for
leaks ("false air").
For proper operation of electrical and electronic
components, a Battery Positive Voltage (B+)
supply of at least 11.5 volts is required.
Do not use any gasket sealers or other
automotive chemical compounds that contain
silicone. Traces of silicone drawn into the
engine pass unburned into the exhaust and can
damage the oxygen sensors.
Do not use any electrical contact sprays or
equivalent near oxygen sensor connections.
Pa
ge 18 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
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pair&id=AUDI.B5.FU03.24.1

Proper oxygen sensor function requires
reference to outside air via the cable. If any
contact spray reaches the oxygen sensor, it can
cause damage or improper function.
During some tests, malfunctions are recognized
by the ECM and stored in DTC memory. For
this reason, always check DTC memory (
page 01
-16
) after all tests and repairs, and
erase DTC memory as necessary.
Pa
ge 19 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&id=AUDI.B5.FU03.24.1