1999 AUDI A4 display

01-101


Display fields

1 2 3 4
Display group 037: Diagnostic of oxygen sensor control system (Bank 1)
Display xxx % x.xxx V x.xx
---
Indicated Load Oxygen sensor
voltage Bank 2,
sensor 1 Oxygen sensor correction value
between bank 1, sensor 1 and bank 1,
sensor 2 Diagnostic condition
Functional
range
Test OFF
Test ON
System OK
System not OK
Specified
value 13 to
40 % 0.100 to 0.950 volts smaller than 0.02 System OK
Note



If "System not OK" is displayed:
Check DTC memory Page 01
-
12

If specified value "Syst. OK" is obtained:

- Perform next work step.
Pa
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01-102

Work step 9: Diagnostic of oxygen sensor
aging behind catalytic converter

Test requirement:

Engine continues to run at 2600 RPM.

Display on VAS5051:
-
Click on - button

Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "043" in button field -2- for "display group number 043"
and press Q button to confirm input.
Pa
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01-103


Display on VAS5051:
- Check specified value in display field -4-.
Pa
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01-104


Display fields

1 2 3 4
Display group 043: Oxygen sensor aging diagnostic, oxygen sensor behind catalytic converter (bank 1)
Display xxxx/min
xxx C
x.xxx V
---
Indicated Engine speed
(RPM) Exhaust
temperature Oxygen sensor voltage
Bank 2, sensor 1 Diagnostic condition
Functional
range Test OFF
Test ON
B1-S2 OK
B1-S2 not OK
Specified
value 2600 RPM larger than 350
C
0.100 to 0.950 volts B1-S2 OK
Note



If "B1-S2 not OK" is displayed: Check
DTC memory Page 01
-12

If specified value B1-S2 OK" is obtained:

- Perform next work step.
Pa
ge 33 of 43 Readiness code11/22/2002 htt
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01-105

Work step 10: Diagnostic of catalytic
converter

Test requirement:

Engine continues to run at 2600 RPM.

Display on VAS5051:
Note:
Catalytic converter diagnostic lasts approx. 60 seconds. -
Press button 3 times to change into display group 046.- Check specified values in display fields -2- and -4-.
Pa
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01-106


Display fields

1 2 3 4
Display group 046: Diagnostic of catalytic converter (bank 1)
Display xxxx/min
xxx C
x.xx
---
Indicated Engine
speed
(RPM) Exhaust temperature Measurement
Catalytic
converter -
conversion Diagnostic condition
Functional
range 0 to 8 Test OFF
Test ON
Cat B1 OK
Cat B1 not OK
Specified
value 2600 RPM
550 to 700 C
Larger than 1.0 Cat B1 OK
Note

As long as the exhaust temperature
is not within the specified range, the
test will not be initiated. If necessary,
increase or decrease RPM
If "Cat B1 not OK" is displayed:
Check DTC memory Page 01
-
12
. If no DTCs are stored,
replace catalytic converter.
If specified value "Cat B1 OK" is obtained:

- Perform next work step.
Pa
ge 35 of 43 Readiness code11/22/2002 htt
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01-107

Work step 11: Diagnostic of tank ventilation
valve

- Remove the VAG1788/10 RPM adjuster and
leave engine running at idle.

Test requirement:

Engine running at idle:

Display on VAS5051:
-
Click on - button

Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "070" in button field -2- for "display group number 070"
and press Q button to confirm input.
Pa
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01-108


Display on VAS5051:
Note:
If test is not initiated or if indication switches from "Test ON" to "Test
OFF", depress accelerator pedal briefly, test will be repeated. - Check specified value in display field -4-.
Pa
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