AUDI A4 2000 B5 / 1.G AWM Engine Motronic Injection System Servicing Owner's Manual

24-19

Wire and component testing 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.).

WARNING!

To avoid damaging electronic components,
set measuring range before connecting test
leads and observe all test requirements.
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24-20

Special Tools and Equipment

Procedure
VAG1598/31
- Switch ignition off.
- Remove Engine Control Module (ECM) Page 24
-22
.

After re-connecting the Engine Control Module (ECM), the following
work steps must be performed: - Connect VAG1598/31 test box to connector of wiring harness. Connect
Ground (GND) clip at test box (not visible in illustration) 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.
- Activate Engine Control Module (ECM) in "Guided Troubleshooting"
below diagnostic object "Engine Control Module (ECM), replacing".
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24-21

Procedure following interruption of
voltage supply


After re-connecting voltage supply, the
following work steps must be performed:

- Activate Engine Control Module (ECM) in
"Guided Troubleshooting" below diagnostic
object "Engine Control Module (ECM),
replacing".
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24-22

Engine Control Module (ECM), replacing


Special Tools and Equipment

Removing
VAS5051 with VAG5051/1
- Connect VAS5051 tester Page 01
-7 and select vehicle system "01 -
Engine electronics". Ignition must remain switched on for this.

VAS5051 tester display will indicate the control module identification and
coding -2-.
- Always allow display of control module identification first and print it
out.
- Compare coding with coding versions Page 01
-73
.
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24-23

- Switch ignition off.

- 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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24-24


- Using a screwdriver, carefully pry off retaining bracket (arrow).

Note:
Adaptation values are erased when connector is disconnected from the
Engine Control Module (ECM), DTC memory content remains intact. - Disengage connector catches (arrows) and disconnect harness
connectors -1- and -2- from control module.
- Remove Engine Control Module (ECM).
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24-25

Installing
Installation is reverse of removal, noting the
following:

After connecting new Engine Control Module
(ECM), the following work steps must be
performed:

- Activate Engine Control Module (ECM) in
"Guided Troubleshooting" below diagnostic
object "Engine Control Module (ECM),
replacing".
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24-26

Idle speed (RPM), checking


Special Tools and Equipment

Test requirements:
VAS5051 with VAG5051/1Exhaus system free of leaks. Coolant Temperature at least 80 C. Electrical consumers switched off (radiator fan must NOT run during
test). A/C switched off. No pressure gauge connected. Vehicles with automatic transmission Selector lever in P or N.
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24-27

Notes:

Idle speed cannot be adjusted.
Idle speed is checked during basic setting of
the engine.
During basic setting, the Evaporative Emission
(EVAP) canister purge regulator valve (EVAP
valve -N80-) is closed and the A/C compressor
is switched off

Test sequence

- Check DTC memory Page 01
-12
. There must
not be any DTCs stored, repair malfunctions if
necessary, erase DTC memory, switch engine
off and start again, road test vehicle and check
DTC memory again as a control measure.

- Let engine continue to run at idle.

WARNING!

The electric fan for the radiator must not be
running.
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24-28


Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic setting".

Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "056" in button field -2- for "display group number 056"
and press Q button to confirm input.
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