1996 AUDI A6 ATW Engine Readiness Code Workshop 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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01-93


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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