1997 AUDI A4 ATQ Engine Motronic Injection System Servicing Workshop Manual

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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24-16


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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24-19


- Remove Heater Core E-box cover -arrows-.

Note:
Adaptation values are erased when connector is disconnected from the
Engine Control Module (ECM), DTC memory content remains intact. - Using a screwdriver, carefully pry off retaining bracket (arrow).
- Disengage locking lugs and remove control module connector.
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24-20


Important note:
After re-connecting the Engine Control Module (ECM), the following work
steps must be performed:
- Check DTC memory and erase it if necessary Page 01
-15
.
- Perform adaptation of the Throttle Valve Control Module -J338- Page
24
-142
.
Note:
In the first adaptation phase during engine basic setting, it is possible that
idle will be rough and vehicle may shake lightly in drive mode. - Connect VAG1598/31 test box to connector of wiring harness. Ground
(GND) clip at test box (not visible in illustration) must be connected to
Ground (GND). Relevant test procedures note whether Engine Control
Module (ECM) should also be connected to the test box.
- Perform test as described in relevant repair sequence.
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24-21

Engine Control Module (ECM), replacing


Special Tools and Equipment

Removing
VAS5051 with VAG5051/1
orVAG1551 with VAG1551/3B
- Connect VAS5051 tester or VAG1551 scan tool and select the control
module for engine electronics using "address word" 01 Page 01
-9 .
Ignition must remain switched on for this.
3B0907551BA
2.8l V6/5V
G
0003
Coding 07252
WSC 12345

VAG1551 Scan Tool (ST) display indicates control module identification,
e.g.:
- First, always allow display of control module identification and print it
out Page 01
-11
.
- Compare coding with coding versions Page 01
-73
.
- Switch ignition off.
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24-22


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

- Remove Heater Core E-box cover -arrows-.
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