1999 AUDI A4 display

01-118


Display fields

1 2 3 4
Display group 041: Oxygen sensor heater, bank 1
Display
xxx kOhm
Heater before before CAT
ON xxx kOhm
Heater before behind CAT
ON
Indicated
Bank 1, Sensor 1
Condition of heater
Bank 1, Sensor 2
Condition of heater
Work range
Heater b. CAT ON
Heater b. TWC OFF
Heater a. CAT ON
Heater a. CAT OFF
Specified
value 0 - 0.5 kOhm
Heater b. CAT ON/OFF
0 - 0.9 kOhm
Heater a. CAT ON/OFF Important note for display fields 1,2,3 and 4:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, that
means both fields are empty. (Increase Engine Speed to reach specified value).
After the operating temperature is reached, the display fields 1 and 3 must display a value of less than 0.5K Ohm
Only proceed with test after value of less than 0.5K Ohm is displayed with in display fields 1 and 3.
The Engine Control Module (ECM) cycles at certain operating conditions the oxygen sensor heating, that means, the
heater is certain operating conditions ON or OFF. It is therefore possible that the specification in display field 2 and 4
appears periodically as "Heater b. CAT OFF" or "Heater a. CAT OFF"
Pa
ge 142 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

- Press -C- button.

- Press buttons -0-, -4- and -2- to select "display
group number 042" and confirm input with -Q-
button.
Pa
ge 143 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-119


Display fields

1 2 3 4
Display group 042: Oxygen sensor heater, bank 1
Display
xxx kOhm
Heater before before CAT
ON xxx kOhm
Heater before behind CAT
ON
Indicated
Bank 1, Sensor 1
Condition of heater
Bank 1, Sensor 2
Condition of heater
Work range
Heater b. CAT ON
Heater b. TWC OFF
Heater a. CAT ON
Heater a. CAT OFF
Specified
value 0 - 0.5 kOhm
Heater b. CAT ON/OFF
0 - 0.9 kOhm
Heater a. CAT ON/OFF
Note
Observe note
below
Observe note
below Important note for display fields 1,2,3 and 4:

Display fields 1 and 3 will not indicate any value if the operating temperature of the oxygen sensors is not reached, that
means both fields are empty. (Increase Engine Speed to reach specified value).
After the operating temperature is reached, the display fields 1 and 3 must display a value of less than 0.5K Ohm
Only proceed with test after value of less than 0.5K Ohm is displayed with in display fields 1 and 3.
Pa
ge 144 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

The Engine Control Module (ECM) cycles at certain operating conditions the oxygen sensor heating, that means, the
heater is certain operating conditions ON or OFF. It is therefore possible that the specification in display field 2 and 4
appears periodically as "Heater b. CAT OFF" or "Heater a. CAT OFF"

- Press -C- button.
Pa
ge 145 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-120

Work step 8: Diagnosis oxygen sensor aging
before catalytic converter

Test requirements

Engine running at 1900 - 2200 RPM
System in Basic Settin
g
Q
Input display group number XXX

Indicated on display
- Press buttons -0-, -3- and -4- to select "display group number 034" and
confirm with -Q- button.
System in Basic Setting 34
1
2
3
4

Indicated on display
- Check specified value in display field 4:
Pa
ge 146 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-121


Display fields

1 2 3 4
Display group 034: Oxygen sensor aging before catalytic converter (bank 1)
Display xxxx/RPM
xxx C
x.x seconds
Test ON
Indicated Engine speed
(RPM) Exhaust
temperature Period duration of oxygen
sensor before CAT Diagnostic condition
Work range 0 - 6800/RPM
70 - 850 C
0.0 - 3.0 Seconds
Test OFF
Test ON
B1-S1 OK
B1-S1 not OK
Specified
value 1900 -
2200/RPM Greater than 260
C 0.1 - 1.0 Seconds
B1-S1 OK
Note



If "B1-S1 not OK" is displayed: Check
DTC memory Page 01
-15
.
If specified value of "B1-S1 OK" is reached:

- Press -C- button.

Test requirements

Engine running at 1900 - 2200 RPM
Pa
ge 147 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

- Press buttons -0-, -3- and -5- to select "display
group number 035" and confirm with -Q- button.
Pa
ge 148 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-122


Display fields

1 2 3 4
Display group 035: Oxygen sensor aging before catalytic converter (Bank 2)
Display xxxx/RPM
xxx C
x.x seconds
Test ON
Indicated Engine speed
(RPM) Exhaust
temperature Period duration of
oxygen sensor
before TWC Diagnostic condition
Work range 0 - 6800/RPM
70 - 850 C
0.0 - 3.0 Seconds
Test OFF
Test ON
B2-S1 OK
B2-S1 not OK
Specified
value 1900 -
2200/RPM greater than 260
C 0.1 - 1.0 Seconds
B2-S1 OK
Note



IF "B2-S1 not OK" is displayed: Check DTC
memory Page 01
-15
.
If specified value of "B2-S1 OK" is reached:

- Press -C- button.
Pa
ge 149 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1