1999 AUDI A6 ATQ Engine Readiness Code Workshop Manual

01-89

Work step 5: Check operating condition of
oxygen sensor control

- Start engine (for a vehicle with manual
transmission: engage clutch).

Note:
After starting engine, it may be necessary to
select the Engine Control Module (ECM) again
using "address word" 01 and the function "Initiate
basic setting" using "04".

- Install VAG1788/10 RPM adjuster on the
accelerator pedal and raise the engine speed.


Specification: 2200 RPM
Basic Settin
g
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -3- and -0- to select "display group number 030" and
press -Q- button to confirm input.
System in Basic Setting 30
1
2
3
4

When indicated on display:
Note:
A few minutes may pass until a diagnostic result is reached. - Check oxygen sensor status in display fields 1 to 4.
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01-90


Display fields

1 2 3 4
Display group 030: Oxygen sensor status with engine at idle
Display
X X X
X X X
X X X
X X X
Indicated
Oxygen sensor status,
bank 1, sensor 1 Oxygen sensor status,
bank 2, sensor 1 Oxygen sensor status,
bank 2, sensor 1 Oxygen sensor status,
bank 2, sensor 2
Functional
range 0 = off
1 = on 0 = off
1 = on 0 = off
1 = on 0 = off
1 = on
Specified
value 1 1 1
1 1 0
1 1 1
1 1 0 Significance of 3 digit indications in display group 030 X
X
X
Display fields 1 to 4
X Oxygen sensor control
0= not active
1 = active
X Operational readiness of oxygen sensor
0= not active
1 = active
X Condition of oxygen sensor heating
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0= not active
1 = active
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01-91

Work step 6: Diagnostic of oxygen sensor
aging before catalytic converter

Test requirement

Engine continues to run at 2200 RPM.
Basic Settin
g
Q
Input display group number XXX

When indicated on display:
- Press buttons -0-, -3- and -4- to select "display group number 034" and
press -Q- button to confirm input.
System in Basic Setting 34
1
2
3
4

When indicated on display:
Note:
A few minutes may pass until a diagnostic result is reached. - Check specified value in display field 4 after indication "Test ON"
appears:
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Display fields

1 2 3 4
Display group 034: Oxygen sensor aging diagnostic, oxygen sensor before catalytic converter (bank 1)
Display xxxx/min
xxx C
x.x s
---
Indicated Engine speed
(RPM) Exhaust
temperature Period duration
Oxygen sensor
before
Catalytic
converter Diagnostic condition
Functional
range 630 to 6800
RPM 70 to 850 C
0 to 3.0 s Test OFF
Test ON
B1-S2 OK
B1-S2 not OK
Specified
value 2200 RPM
above 380 C 0.1 to 1.8 s B1-S2 OK
Notes



If "B1-S1 not OK" is displayed: Check Diagnostic
Trouble Code (DTC) memory Page 01
-15

If specified value "B1-S1 OK" is obtained:

- Press -C- button.Basic Setting
Q
Input display group number XXX

When indicated on display:
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- Press buttons -0-, -3- and -5- to select "display group number 035"
and press -Q- button to confirm input.
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01-93
If specified value "B2-S1 OK" is obtained:
System in Basic Setting 35
1
2
3
4

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

Display fields

1 2 3 4
Display group 035: Oxygen sensor aging diagnostic, oxygen sensor before catalytic converter (bank 2)
Display xxxx/min
xxx C
x.x s
---
Indicated Engine speed
(RPM) Exhaust
temperature Period duration
Oxygen sensor
before
Catalytic
converter Diagnostic condition
Functional
range 630 to 6800
RPM 70 to 850 C
0 to 3.0 s Test OFF
Test ON
B2-S2 OK
B2-S2 not OK
Specified
value 2200 RPM
above 380 C 0.1 to 1.8 s B2-S2 OK
Notes



If "B2-S1 not OK" is displayed: Check Diagnostic
Trouble Code (DTC) memory Page 01
-15

- Press -C- button.
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01-94

Work step 7: Diagnostic of operational
readiness of oxygen sensors behind catalytic
converter

Test requirement

Engine continues to run at 2200 RPM.
Basic Setting
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -3- and -6- to select "display group number 036" and
press -Q- button to confirm input.
System in Basic Setting 36
1
2
3
4

When indicated on display:
- Check specified values in display fields 2 and 4.
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