1995 AUDI A4 sensor

24-5


Component locations, overview

Note:
Component location without illustration:
----
- Leak Detection Pump (LDP) -V144-
Below rear left wheelhousing liner
1 -
Evaporative Emission (EVAP) canister
purge regulator valve -N80- Checking Page 24
-114
2 -
Heated Oxygen Sensor (HO2S) -G39-
before catalytic converter, 55 Nm
Constant oxygen sensorCheck Oxygen Sensor (O2S) and oxygen
sensor control before Three Way Catalytic
Converter (TWC) Page 24
-71

Check oxygen sensor aging of oxygen
sensor before catalytic converter Page 24
-84

Check oxygen sensor heater for Oxygen
Sensor (O2S) before Three Way Catalytic
Converter (TWC) Page 24
-89

Removing and installing Page 24
-112
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24-6


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine
Mechanical, Engine Code(s): AWM, Engine Code(s): AWM, Repair Group 26; Secondary Air Injection (AIR) system, checking
3 -
Oxygen Sensor (O2S) behind Three Way
Catalytic Converter (TWC) -G130-, 55 Nm
Check Oxygen Sensor (O2S) and oxygen
sensor control behind Three Way Catalytic
Converter (TWC) Page 24
-94

Check oxygen sensor heater for Oxygen
Sensor (O2S) behind Three Way Catalytic
Converter (TWC) Page 24
-107

Removing and installing Page 24
-112
4 -
Combination valve for secondary air
injection (AIR)
Checking, removing and installing:
5 -
Engine Coolant Temperature (ECT) sensor
-G62-
Checking Page 28
-31
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24-7


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine
Mechanical, Engine Code(s): AWM, Repair Group 26; Secondary Air Injection (AIR) system, checking

6 -
Fuel pressure regulator
Checking Page 24
-32
7 -
Engine Speed (RPM) sensor -G28-
Checking Page 28
-27
8 -
Secondary Air Injection (AIR) solenoid
valve-N112-
Installation location Fig. 4
, Page
24
-14

Checking:Green harness connector
9 -
Bracket for harness connectors Component location Fig. 1
, Page
24
-13

Accessible with coolant expansion tank
unbolted and swung to the side.
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24-8


10 -
Instrument cluster
with exhaust Malfunction Indicator Lamp
(MIL). Notes for Malfunction Indicator Lamp
(MIL) Page 01
-3
with Electronic Power Control (EPC)
warning lamp -K132- (EPC warning lamp).
Significance of EPC warning lamp Page 24
-122

11 -
Throttle Position (TP) sensor -G79- and
sender 2 for accelerator pedal position -
G185-
Component location Fig. 5
, Page
24
-15

Checking Page 24
-138
Adapt kick down function Page 24
-145
12 -
Brake light switch -F- and brake pedal
switch -F47-
Component location Fig. 3
, Page
24
-14

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24-9


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine
Mechanical, Engine Code(s): AWM, Repair Group 26; Secondary Air Injection (AIR) system, checking

13 -
E-box, plenum chamber
Installation locations Fig. 6
, Page
24
-15

Installation location for motronic Engine
Control Module (ECM) -J220- with
integrated Barometric pressure (BARO)
sensor -F96- Check voltage supply of Engine Control
Module (ECM) Page 28
-37

Procedure to follow after open circuit in
voltage supply Page 24
-21

Replacing Engine Control Module (ECM)
Page 24
-22

Installation location of Secondary Air
Injection (AIR) pump relay -J299- Check Secondary Air Injection (AIR) pump
relay -J299-: Installation location of motronic Engine
Control Module (ECM) voltage supply relay
-J271- Check motronic Engine Control Module
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24-10


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine
Mechanical, Engine Code(s): AWM, Repair Group 21, Charge air system with turbocharger, checking
14 -
Clutch vacuum vent valve switch -F36-
Component location Fig. 3
, Page
24
-14

15 -
Charge air pressure sensor -G31-
Installation location Fig. 7
, Page
24
-16

Checking:
16 -
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- Checking Page 24
-124
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24-11


17 -
Intake Air Temperature (IAT) sensor -G42-
Checking Page 28
-21
18 -
Recirculating valve for turbocharger-
N249-
Installation location Fig. 4
, Page
24
-14

Blue harness connector
19 -
Knock Sensor (KS) 1 -G61-
20 -
Knock Sensor (KS) 2 -G66-
21 -
Camshaft Position (CMP) sensor 2 -G40- Checking Page 28
-49
22 -
Fuel injector
Cylinder 1 Fuel Injector -N30-Cylinder 2 fuel injector -N31-Cylinder 3 fuel injector -N32-Cylinder 4 fuel injector -N33-Checking Page 24
-37
Removing and installing Page 24
-45
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24-12


Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine
Mechanical, Engine Code(s): AWM, Repair Group 21, Charge air system with turbocharger, checking

Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine
Mechanical, Engine Code(s): AWM, Repair Group 26; Secondary Air Injection (AIR) system, checking

23 -
Ignition coil
Ignition coil -N-Ignition coil 2 -N128-Ignition coil 3 -N158-Ignition coil 4 -N163-Checking Page 28
-4
24 -
Wastegate bypass regulator valve -N75-
Checking:
25 -
Mass Air Flow (MAF) sensor -G70-
Checking Page 24
-59
26 -
Secondary Air Injection (AIR) pump
motor-V101-
Checking:
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