AUDI A4 2000 B5 / 1.G ATQ Engine Motronic Injection System Servicing User Guide

24-9


17 -
Engine Coolant Temperature (ECT) sensor
-G62-
for Engine Control Module (ECM)At coolant line behind cylinder head engine
bank 1 with Engine Coolant Temperature (ECT)
Sensor -G2- Checking Page 28
-23
If necessary, release pressure in cooling
system before removing
18 -
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-
19 -
Intake Manifold Change-Over Valve -N156-
20 -
Fuel pressure regulator
21 -
Engine Speed (RPM) sensor -G28- in transmission housing via ring gearChecking Page 28
-19
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22 -
Camshaft Position (CMP) sensor 2 -G40-
Bank 2
23 -
Heated Oxygen Sensor (HO2S) 2 -G108-
before catalytic converter with Oxygen
Sensor (O2S) 2 Heater -Z28- Bank 2, sensor 1
24 -
Knock Sensor (KS) 2 -G66-
25 -
Ignition coils (-N-, -N128-, -N158-) with power output stage -N122-
26 -
Knock Sensor (KS) 1 -G61-
27 -
Fuel injectors -N30- through -N33-
,Cylinder 5/6 Fuel Injector -N83-, -N84-
28 -
Valve -1- for camshaft adjustment -N205-
29 -
Secondary Air Injection (AIR) pump
motor-V101-
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24-11


Fig. 7 Component location, fault light for power accelerator
activation -K132-

Fig. 8 Installation position, Throttle Position (TP) sensor -G79-
and sender 2 for accelerator pedal position -G185-
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Note:
In order to assure sufficiently secure fitting, switches must not be installed
more than once.
Adjusting switch:
Repair Manual, Brake System, ABS, ABS/EDL, Repair Group 46
Fig. 9 Component location Brake Light Switch -F- and Brake
Vacuum Vent Valve Switch For Cruise Control/Diesel Fuel
Injection, Clutch Vacuum Vent Valve Switch -F36-
1 - Clip
2 - Brake Light Switch -F-, Brake Vacuum Vent Valve Switch For Cruise
Control/Diesel Fuel Injection -F47-
3 - Clutch vacuum vent valve switch -F36-

Secondary Air Injection (AIR) Pump Relay -J299- (arrow) in 3-pin relay
carrier in E-box, plenum chamber. Fig. 10 Component location for Secondary Air Injection (AIR)
Pump Relay -J299-
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24-13


Fuel Pump (FP) Relay -J17- is located at position 4 of central electrics in
driver's footwell, left. Fig. 11 Component locations Fuel Pump (FP) Relay -J17-

Data Link Connector (DLC) in knee bolster on driver's side. Fig. 12 Component location of Data Link Connector (DLC)
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24-14


Air filter, disassembling and assembling

1 -
Cover
2 -
Air duct
to metering unit
3 -
Mass Air Flow (MAF) sensor -G70-
4 -
10 Nm
5 -
Connection hose
6 -
Seal
7 -
Air filter, upper portion
8 -
Rubber grommet
9 -
Filter element
10 -
Air filter, lower portion
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24-15


Intake manifold change-over components,
removing and installing

1 -
Vacuum setting element
2 -
Compression spring
3 -
Rotary change-over valve
4 -
Intake Manifold
5 -
Check-valve
Installed position: blue side toward Y-piece
6 -
Y-piece
7 -
Intake manifold change-over valve -N156-
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8 -
10 Nm
9 -
Securing plate
10 -
Rubber grommet
11 -
Spacer sleeve
12 -
Washer
conical side toward intake manifold
13 -
Seal Replace if damaged
14 -
Seal for rotary change-over valveReplace if damaged
15 -
6 Nm
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24-17

Wire and component test using
VAG1598/31 test box


Notes:

VAG1598/31 test box is designed so that it can
be simultaneously connected to the wiring
harness at the Engine Control Module (ECM)
and also to the ECM itself.
This is advantageous because electronic
engine control remains fully functional (e.g.
measurement of signals with engine running)
when the test box is attached.
Relevant test procedures note whether Engine
Control Module (ECM) should also be
connected to the test box or not.
Always use VAG1594A connector test kit to
attach measurement devices (e.g. VAG1527B
voltage tester, VAG1526 multimeter etc.).

CAUTION!

To reduce the risk of damaging electronic
components, set the tester to the approprate
test range and observe test requirements
before connecting test leads.
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24-18

Special Tools and Equipment

Procedure
VAG1598/31
- Switch ignition off.

- Pull off rubber seal of plenum chamber cover in direction of arrow.
- Remove cover -1- toward front.
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