display AUDI A6 1999 C5 / 2.G ATW Engine Readiness Code Owner's Manual

01-86

Work step 8: Diagnostic of oxygen sensor
control system

Test requirement:

Engine continues to run at 2000 RPM.
Basic Settin
g
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -3- and -7- to select "display group number 037" and
press -Q- button to confirm input.
System in basic setting 37
1
2
3
4

When indicated on display
- Check specified value in display field 4:
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01-87


Display fields

1 2 3 4
Display group 037: Diagnostic of oxygen sensor control system (Bank 1)
Display xxx % x.xxx volts xxx ms
---
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 12 to
30 % 0.100 to 0.950 V -150 to 150 ms System OK
Note



If "System not OK" is displayed:
Check DTC memory Page 01
-
16

If specified value "Syst. OK" is obtained:

- Press -C- button.
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01-88

Work step 9: Diagnostic of catalytic converter

Test requirement:

Engine continues to run at 2000 RPM.
Basic Settin
g
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -4- and -6- to select "display group number 046" and
press -Q- button to confirm input.
System in basic setting 46
1
2
3
4

When indicated on display
Note:
Catalytic converter diagnostic lasts approx. 60 seconds. - Check specified values in display fields 2 and 4:
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01-89


Display fields

1 2 3 4
Display group 046: Diagnostic of catalytic converter (bank 1)
Display xxxx/min
xxx C
x.x
---
Indicated Engine speed
(RPM) Exhaust
temperature Measurement
Catalytic converter -
conversion Diagnostic condition
Functional
range Test OFF
Test ON
Cat B1 OK
Cat B1 not OK
Specified
value 2000 RPM more than
430 C
0.0 to 0.2 Cat B1 OK
Note



If "Cat B1 not OK" is displayed: Check DTC
memory Page 01
-16
. If no DTCs are stored,
replace catalytic converter.
If specified value "Cat B1 OK" is obtained:

- Press -C- button.
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01-90

Work step 10: Diagnostic of Secondary Air
Injection (AIR) system

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

Test requirement:

Engine running at idle:

Note:
During diagnostic of the Secondary Air Injection
(AIR) system, the Secondary Air Injection (AIR)
pump will run for several seconds.
Basic Settin
g
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -7- and -7- to select "display group number 077" and
press -Q- button to confirm input.
System in basic setting 77
1
2
3
4

When indicated on display
- Check specified value in display field 4:
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01-91


Display fields

1 2 3 4
Display group 077: Secondary Air Injection (AIR) system diagnostic (Bank 1)
Display xxxx/min xx.x g/s xx.x g/s
---
Indicated Engine speed
(RPM) Air
mass Air mass Secondary air
system Diagnostic condition
Functional
range
Test OFF
Test ON
System OK
System not OK
Aborted
Specified
value FWD: 740 to 860
RPM
AWD: 800 to 920
RPM 2 to 5
g/s 4 to 10 g/s System OK
Note


If "System not OK" is displayed: Check DTC
memory Page 01
-16

If specified value "Syst. OK" is obtained:

- Press -C- button.
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01-92

Work step 11: Diagnostic of tank ventilation
valve

Test requirement:

Engine running at idle:
Basic Settin
g
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -7- and -0- to select "display group number 070" and
press -Q- button to confirm input.
System in basic setting 70
1
2
3
4

When indicated on display
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:
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Display fields

1 2 3 4
Display group 070: Diagnostic of tank ventilation valve
Display xx % xx %
---
Indicated Degree tank
ventilation valve is
opened Oxygen
sensor control
Diagnostic
value
Diagnostic condition
Functional
range

Test OFF
Test ON
TVV OK
TVV not OK
Aborted
Specified
value 0 to 99 % -7.0 to 7.0 %

TVV OK
Note


If "TVV not OK" is displayed: Check DTC memory Page 01
-
16
. Check Evaporative Emission (EVAP) canister purge
regulator valve -N80- Page 24
-107

If specified value "TVV OK" is obtained:

- Press -C- button.
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01-94

Work step 12: Diagnostic of tank seal

Test requirements:

Engine running at idle:
Fuel filler cap opened briefly (to reduce
pressure).
Basic Settin
g
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -7- and -1- to select "display group number 071" and
press -Q- button to confirm input.
System in basic setting 71
1
2
3
4

When indicated on display
Note:
Test lasts approx. 90 seconds.When the diagnostic of tank seal is performed several times in a row,
the fuel filler cap must be opened briefly before each test to release
pressure.
- Check specified value in display field 4:
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01-95


Display fields

1 2 3 4
Display group 071: Diagnostic of tank seal
Display --- --- ---
---
Indicated Condition Reed-
Terminal DTC
message System condition
Diagnostic condition
Functional
range Reed open
Reed closed Small leak
Large leak System test
Measurement
END
Measurement Test OFF
Test ON
System OK
System not OK
Aborted
Specified
value Reed open --- END
Measurement System OK
Note


If "System not OK" is displayed: Check DTC
memory Page 01
-16

If specified value "Syst. OK" is obtained:

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display (function selection)
Work step 13: Read readiness code
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