fuel AUDI TT 1996 8N / 1.G ATW Engine Output Diagnostic Test Mode Workshop Manual

01-49


Output Diagnostic Test Mode
(DTM) (function 03)

Note:

Output Diagnostic Test Mode (DTM) is only
possible with engine idle and ignition switched
on.
The electric Fuel Pump (FP) runs during all of
output Diagnostic Test Mode (DTM).
In output Diagnostic Test Mode (DTM),
individual actuators (with the exception of the
fuel injectors) are activated for approximately 1
minute unless the next actuator is selected
earlier by pressing the button.

Actuators are checked either acoustically or by
touch.
Output Diagnostic Test Mode (DTM) is aborted
if engine is started or an RPM signal is
recognized.
Before re-initiating output Diagnostic Test Mode
(DTM), engine must be started and the ignition
must be switched off and on again.
Pa
ge 1 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4

01-50
Output Diagnostic Test Mode (DTM) activates
the following components in the specified
sequence:

Activation sequence
1 Evaporative Emission (EVAP) canister purge
regulator valve -N80-
2 Secondary Air Injection (AIR) solenoid valve
-N112-
3 Secondary Air Injection (AIR) pump relay -
J299-
4 Wastegate bypass regulator valve -N75-
5 Leak Detection Pump (LDP) tank ventilation
system
6 Recirculating valve for turbocharger -N249-
7 Cylinder 1 fuel injector -N30-
8 Cylinder 3 fuel injector -N32-
9 Cylinder 4 fuel injector -N33-
10 Cylinder 2 fuel injector -N31-

Test requirement:

Fuses for engine electronics OK

Pa
ge 2 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4

01-51

Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
. Ignition
must remain switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -3- to select "output Diagnostic Test Mode" and
press -Q- button to confirm input.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
Activating the EVAP canister purge regulator valve (tank ventilation
valve)
Note:
The Fuel Pump (FP) relay must trigger, the Fuel Pump (FP) must run,
flowing noise at fuel pressure regulator is clearly audible. If Fuel Pump
(FP) does not run, check activation Page 24
-56
. - Confirm input using -Q- button.
Pa
ge 4 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4

01-55
If valve is not activated (does not click):

Repair Manual, Fuel Supply System, Repair
Group 20; components of the EVAP canister system, servicing; Leak Detection Pump (LDP)
-
V144
-, checking.


Activating fuel injectors

Note:
Fuel injectors are activated according to ignition
sequence: Cyl. 1, Cyl. 3, Cyl 4, Cyl. 2.

-
Press button.Output Diagnostic Test Mode (DTM) Cylinder 1 fuel in
jector -N30-

Indicated on display
-
Press button.
Output Diagnostic Test Mode (DTM) Cylinder 1 fuel in
jector -N30-

Indicated on display
If injector does not click:
Fuel injector must click 5 times after button is pressed.
- Check fuel injectors Page 24
-38
.
-
Press button.
Pa
ge 9 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4

Output Diagnostic Test Mode (DTM) Cylinder 3 fuel in
jector -N32-

Indicated on display
Pa
ge 10 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4

01-56

-
Press button.Output Diagnostic Test Mode (DTM) Cylinder 3 fuel injector -N32-

Indicated on display
If injector does not click:
Fuel injector must click 5 times after button is pressed.
- Check fuel injectors Page 24
-38
.
-
Press button.
Output Diagnostic Test Mode (DTM) Cylinder 4 fuel in
jector -N33-

Indicated on display
-
Press button.
Output Diagnostic Test Mode (DTM) Cylinder 4 fuel injector -N33-

Indicated on display
If injector does not click:
Fuel injector must click 5 times after button is pressed.
- Check fuel injectors Page 24
-38
.
-
Press button.
Output Diagnostic Test Mode (DTM) Cylinder 2 fuel injector -N31-

Indicated on display
-
Press button.
Pa
ge 11 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4

01-57

Output Diagnostic Test Mode (DTM) Cylinder 2 fuel in
jector -N31-

Indicated on display
If injector does not click:
Fuel injector must click 5 times after button is pressed.
- Check fuel injectors Page 24
-38
.
-
Press button after activation of last fuel injector (cylinder 2).
Output Diagnostic Test Mode (DTM) DONE

Indicated on display
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display (function selection)
Note:
Before re-initiating output Diagnostic Test Mode (DTM), engine must be
started and the ignition must be switched off and on again.
Pa
ge 12 of 12 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.4