sensor 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
pedal
B - Diagnostic connectorIn front knee protection, driver side
C - Fuel Pump (FP) relay -J17-Relay position 4 of central electrics left side
under dash panel
D - Clutch Vacuum Vent Switch -F36In footwell on pedal frame
E - Throttle Position (TP) Sensor -G79-
and Sender -2- for accelerator pedal
position -G185 In footwell on accelerator pedal (both
senders are installed in one housing)
Pa
ge 7 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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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 24
-139
)
G - Leak Detection Pump (LDP) -V144
Below left rear wheelhousing liner
H - Oxygen Sensor (O2S) Behind Three
Way Catalytic Converter (TWC) -G130
with Heater for Lambda-probe 1 -Z29
This oxygen sensor is accessible from
below when vehicle is lifted
I - Oxygen Sensor (O2S) 2 Behind Three
Way Catalytic Converter (TWC) -G131
with Heater for Lambda-probe 2 -Z30 This oxygen sensor is accessible from
below when vehicle is lifted
Pa
ge 8 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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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
(O2S) 2 Behind Three Way Catalytic
Converter (TWC) -G131 and Heater for
Lambda-probe 2 -Z30 4-pin brown
3 -
Harness connector for Heated Oxygen
Sensor (HO2S) and Oxygen Sensor (O2S)
Heater 4-pin black
4 -
3-pin harness connector For Knock sensor (KS) 1 -G61
5 -
Engine Coolant Temperature (ECT)
Sensor -G62 On cooling pipe behind cylinder bank 1
6 -
Wastegate Bypass Regulator Valve -N75
7 -
EVAP Canister Purge Regulator Valve -
N80
Pa
ge 9 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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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 the Sensor -2- for exhaust
temperature -G236 is located at this
position see page Page 24
-14
.
9 -
Secondary Air Injection (AIR) Solenoid
Valve -N112
Only on vehicles with automatic
transmission
10 -
Secondary Air Injection (AIR) Pump Motor
-V101 Only on vehicles with automatic
transmission
11 -
Sensor -2- for exhaust temperature -G236 On vehicles with automatic transmission
the sensor is located with Sensor -1- for
exhaust temperature -G235 at Position -8-.
Both sensors are located behind each
other Page 24
-14
.
Pa
ge 10 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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pair&id=AUDI.B5.FU04.24.1

24-9


12 -
Recirculating valve for turbocharger -
N249
13 -
Fuel pressure regulator
14 -
Camshaft Position (CMP) Sensor 2 -G163
Cylinder bank 2Previously identified as Camshaft Position
(CMP) Sensor 2 -G40
15 -
Secondary Air Injection (AIR) Pump Relay
-J299 Only on vehicles with automatic
transmission
16 -
Motronic Engine Control Module (ECM) -
J220
17 -
3-pin harness connector For Engine Speed (RPM) Sensor -G28grey
18 -
3-pin harness connector For Knock Sensor (KS) 2 -G66
19 -
Harness connector for Heated Oxygen
Sensor (HO2S) 2 -G108 and Oxygen
Sensor (O2S) Heater -Z28 4-pin black
Pa
ge 11 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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play?action=Goto&t
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24-10


20 -
Valve -2- for camshaft adjustment -N208
21 -
Throttle Valve Control Module -J338
With Throttle drive (power accelerator
actuation) -G186, Angle sensor -1- for
throttle drive (power accelerator actuation)
-G187 and Angle sensor -2- for throttle
drive (power accelerator actuation) -G188
22 -
Charge Air Pressure Sensor -G31 In rubber below before Throttle Valve
Control Module
23 -
Camshaft Position (CMP) Sensor 1 -G40 Cylinder bank 1Previously identified as Camshaft Position
(CMP) Sensor 1 -G163
24 -
Power output stage -N192 For ignition coils cylinder bank 2
25 -
Power output stage -N122 For ignition coils cylinder bank 1
Pa
ge 12 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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24-11


26 -
Valve -1- for camshaft adjustment -N205
27 -
Heated Oxygen Sensor (HO2S) -G39 with
Oxygen Sensor (O2S) Heater -Z19
28 -
Knock Sensor (KS) 1 -G61
29 -
Knock Sensor (KS) 2 -G66
30 -
Engine Speed (RPM) Sensor -G28
In transmission above sensor wheel
31 -
Heated Oxygen Sensor (HO2S) 2 -G108
and Oxygen Sensor (O2S) Heater -Z28
Pa
ge 13 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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24-12


32 -
Ignition coils cylinder bank 2
Ignition Coil 4 -N163Ignition Coil 5 -N164Ignition Coil 6 -N189
33 -
Fuel Injectors Cylinder bank 2Cylinder 4 Fuel Injector -N33Cylinder 5 Fuel Injector -N83Cylinder 6 Fuel Injector -N84
34 -
Intake Air Temperature (IAT) Sensor -G42 Under intake manifold at the front, near the
throttle valve control module
35 -
2-pin harness connector For intake air temperature sensor
(Measurements must be carried out at this
connection)
Pa
ge 14 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
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yp
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24-13


36 -
Fuel Injectors
Cylinder bank 1Cylinder 1 Fuel Injector -N30Cylinder 2 Fuel Injector -N31Cylinder 3 Fuel Injector -N32
37 -
Ignition coils cylinder bank 1 Ignition Coil -NIgnition Coil 2 -N128Ignition Coil 3 -N158
38 -
Mass Air Flow (MAF) Sensor -G70
Pa
ge 15 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-14

Component location for exhaust temperature
sensors on vehicle with automatic
transmission:

Fig. 1 Component location for exhaust temperature sensors on
vehicle with automatic transmission:
1 - Sensor -1- for exhaust temperature -G235
2 - Sensor -2- for exhaust temperature -G236
Pa
ge 16 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1