AUDI TT 1995 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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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
)
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yp
e=re
pair&id=AUDI.B5.FU06.01.4

Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Pa
ge 3 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

01-52

Output Diagnostic Test Mode (DTM) Evap. canister pur
ge re
gulator valve

Indicated on display:(or, indicated: tank ventilation valve -N80-)
If valve is not activated (does not click):
Activating the Secondary Air Injection (AIR) solenoid valve
This valve is activated for approx. 1 minute (clicks), unless button is
pressed first to switch to the next actuator.
- Check Evaporative Emission (EVAP) canister purge regulator valve -
N80- Page 24
-107
.
-
Press button.
Output Diagnostic Test Mode (DTM) Secondar
y Air In
jection solenoid valve

Indicated on display
If valve is not activated (does not click):
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine
Code(s): AEB, ATW, Repair Group 26; Checking Secondary Air Injection (AIR) system

This valve is activated for approx. 1 minute (clicks), unless button is
pressed first to switch to the next actuator.
- Check Secondary Air Injection (AIR) solenoid valve -N112-:
Pa
ge 5 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

01-53

Activating the Secondary Air Injection (AIR)
pump relay

-
Press button.Output Diagnostic Test Mode (DTM) Secondary Air Injection pump relay

Indicated on display
If the Secondary Air Injection (AIR) pump motor does not start up in
intervals:
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine
Code(s): AEB, ATW, Repair Group 26; Checking Secondary Air Injection (AIR) system

Activating wastegate bypass regulator valve -N75-
The Secondary Air Injection (AIR) pump relay -J299- (in 3-socket relay
carrier in the E-box, at left in the plenum chamber , position 2)
switches the Secondary Air Injection (AIR) pump motor -V101- on for
approx. 1 minute and off in intervals unless the next actuator is
selected first by pressing the button.
- Check Secondary Air Injection (AIR) pump relay -J299-:-
Press button.
Output Diagnostic Test Mode (DTM) Waste
gate b
ypass re
gulator valve -N75-

Indicated on display
This valve is activated for approx. 1 minute (clicks), unless button is
pressed first to switch to the next actuator.
Pa
ge 6 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

01-54
If valve is not activated (does not click):

Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo
Engine Mechanical, Engine Code(s): AEB, ATW, Repair Group 21, Charge air system with turbocharger


Turbocharger boost pressure recirculation
valve, activating

-
Press button.Output Diagnostic Test Mode (DTM) Recirculatin
g valve for turbochar
ger -N249-

Indicated on display
If valve is not activated (does not click):
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine
Code(s): AEB, ATW, Repair Group 21, Charge air system with turbocharger

Activating Leak Detection Pump (diagnostic pump for tank
ventilation system)
This valve is activated for approx. 1 minute (clicks), unless button is
pressed first to switch to the next actuator.
-
Press button.
Output Diagnostic Test Mode (DTM)

Indicated on display
Pa
ge 7 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

Leak Detection Pump tank vent. s
ystem
Note:
The click can be heard by listening near the rear left wheelhousing.
The change-over valve in the LDP is activated for approximately 1
minute (clicks), unless button is pressed first to switch to the next
actuator.
Pa
ge 8 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