check engine AUDI A4 1999 B5 / 1.G Brakes Output DTM 03 Workshop Manual

01-151

Notes:

To avoid overloading the components being
checked, they are actuated during the test
sequence for a period of 60 (or 90) seconds.
The actuator test will be terminated if the "
button" is not pressed within this period.

The ABS warning light and the red "brake
system malfunction" symbol blink during the
test.
Pressing the brake pedal repeatedly this
relieves the vacuum in the brake booster. For
this reason, the brake pedal must be pressed
harder in order to achieve the same braking
effect. Your work will be easier if you run the
engine briefly. This will build up vacuum in the
brake booster again.
Pa
ge 4 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-166

Electrical testing


If the On Board Diagnostic (OBD) sequence
does not provide any indication of the source of
the malfunction, work through all of the
electrical test steps.
If the OBD sequence identifies the source of the
malfunction, only carry out the test steps
recommended in the DTC table (specific
testing).

Test requirements
The "Automatic Test Sequence" was carried
out and it was determined that the
Transmission Control Module (TCM) and
Engine Control Module (ECM) only contain
DTCs relating to ABS/EDL.

- Connect the VAG1551 Scan Tool (ST) and
select the address word 00 with ignition
switched on;

- After completing electrical test, check and
erase DTC memories of Transmission Control
Module (TCM) and Engine Control Module
(ECM).
Pa
ge 20 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-196

DTC
Possible cause
Corrective action
Printed output from
VAG1551 Scan Tool
(ST)

00529
Wheel speed information
missing

Continuation: Data is transferred between ABS
control module -J104- and Engine
Control Module (ECM) via the
CAN-bus. For more information, see the section "Systems related
to ASR" page 01
-42
and the table "Control module
versions" page 01
-134
.
This malfunction only
occurs if vehicle is
equipped with ASR.


The Engine Control Module
(ECM) is not able to provide the
engine speed (RPM) signal for
the CAN-bus. - Check DTC memory of Engine Control Module (ECM).
If there is a malfunction, fix it according to the
appropriate engine Repair Manual and erase DTC
memory of the Engine Control Module (ECM).
- If there are no DTCs stored in the Engine Control
Module (ECM), replace the Engine Control Module
(ECM) as a test.

The ABS control module
(w/EDL) -J104- is not able to
evaluate the engine speed
(RPM) signal for the CAN-bus. - If the steps listed above do not repair the malfunction,
replace the ABS control module -J104-.
Pa
ge 56 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-202

DTC
Possible cause
Corrective action
Printed output from
VAG1551 Scan Tool
(ST)

00761
DTC stored in Engine
Control Module (ECM)

This malfunction only
occurs if vehicle is
equipped with ASR. Data is transferred between ABS
control module -J104- and Engine
Control Module (ECM) via a single
wire or via the CAN-bus. For more information, see the section "Systems
related to ASR" page 01
-42
and the table "Control
module versions" page 01-134
.


A DTC was stored in the Engine
Control Module (ECM). The Engine
Control Module (ECM) is not able to
reduce engine torque. - Check DTC memory of Engine Control Module
(ECM). Repair the malfunction according to the
appropriate engine Repair Manual and erase DTC
memory of the Engine Control Module (ECM).
Pa
ge 62 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13