AUDI A6 1995 C5 / 2.G AHA Engine Readiness Code User Guide

01-79

- Increase engine speed to 1800-2200 RPM.

- Hold at 1800-2200 RPM until specified value
"111" is shown in all of display fields 1 - 4 (
table).

Display fields

1 2 3 4
Display group 30: Oxygen Sensor (O2S) control operating condition, Bank 1 and Bank 2
Display xxx xxx xxx xxx
Indicated Status of Heated Oxygen
Sensor (HO2S), bank 1,
sensor 1, before TWC Status of Heated Oxygen
Sensor (HO2S) 2, bank 1
sensor 2, after TWC Status of Heated Oxygen
Sensor (HO2S), bank 2,
sensor 1, before TWC Status of Heated Oxygen
Sensor (HO2S) 2, bank 2
sensor 2, after TWC
Specified
value 111 111 111 111
Evaluation page 01
-80

If one of the specified values is not indicated:

- Check DTC memory page 01
-16
.
If the specified values for display fields 1-4 are
not indicated:

- Continue to hold engine speed at 1800-2200
RPM.
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01-80

Explanation of 3-digit value in display fields 1
and 2:

When display = 1
1
2
3

1 Oxygen Sensor (O2S) control active
1 Heated Oxygen Sensor (HO2S)
operational
1 Oxygen Sensor (O2S) heater ON

Step 6: Oxygen sensor aging (time period)

- Press button -4- to select "Basic Setting"
function 04.

- Press button -3- four times to advance to display
group number 34. System in Basic Setting 34
1
2
3
4

Indicated on display (1-4 display fields) - Hold engine speed at 1800-2200 RPM until display changes from "Test
OFF" to "Test ON" in display field 4.
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01-81

- Continue to hold at 1800-2200 RPM until
specified value "B1-S1. OK" is indicated in
display field 4.

Display fields

1 2 3 4
Display group 34: Oxygen sensor aging, Bank 1 (time period of oxygen sensor)
Display xxxx RPM xx.xx ms xx.xx s Test OFF/Test
ON
B1-S1 OK/
B1-S1 n. OK
Indicated Engine speed
(increments of 40
RPM) Engine load Time period of HO2S before TWC, bank 1,
sensor 1 Diagnostic status

Diagnostic result
Range 0-6800 RPM 0.00-12.75
ms 0.00-5.00 s ---
Specified
value 1800-2200 RPM 0.80-2.00 ms 0.20-2.10 s B1-S1 OK If "B1-S1 n. OK" is indicated in display field 4:

- Check DTC memory page 01
-16
.
If the specified value "B1-S1 OK" is indicated in
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display field 4:

- Continue to hold engine speed at 1800-2200
RPM.

- Press button -3- once to advance to display
group number 35.
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01-82

System in Basic Setting 35
1
2
3
4

Indicated on display (1-4 display fields) - Hold engine speed at 1800-2200 RPM until display changes from "Test
OFF" to "Test ON" in display field 4.
- Continue to hold at 1800-2200 RPM until specified value "B2-S1 OK" is
indicated in display field 4.

Display fields

1 2 3 4
Display group 35: Oxygen sensor aging, Bank 2 (time period of
oxygen sensor)
Display xxxx RPM xx.xx
ms xx.xx s Test
OFF/Test
ON
B2-S1 OK/
B2-S1 n.
OK
Indicated Engine speed
(increments of 40
RPM) Engine
load Time period of
HO2S before
TWC, bank 2,
sensor 1 Diagnostic
status
Diagnostic
result
Range 0-6800 RPM 0.00-
12.75
ms 0.00-5.00 s ---
Specified 1800-2200 RPM 0.80- 0.20-2.10 s B2-S1 OK
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If "B1-S1 n. OK" is indicated in display field 4:
If the specified value "B1-S1 OK" is indicated in display field 4: value 2.00 ms - Check DTC memory page 01
-16
.
- Continue to hold engine speed at 1800-2200 RPM.
- Press -C- button.
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01-83

Step 7: Three Way Catalytic Converter (TWC)
diagnosis Basic Setting
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -4- and -6- to input display group number 46 (046),
and press -Q- button to confirm input.
System in Basic Setting 46
1
2
3
4

Indicated on display (1-4 display fields)
Note:
The test time for TWC diagnosis is approx. 60 seconds. - Hold engine speed at 1800-2200 RPM until display changes from "Test
OFF" to "Test ON" in display field 4.
- Continue to hold at 1800-2200 RPM until specified value "Cat B1 OK"
is indicated in display field 4.
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01-84


Display fields

1 2 3 4
Display group 46: Three Way Catalytic Converter (TWC), Bank 1 diagnosis
Display x.xx x xx.x s Test OFF/Test ON
Cat B1 OK/
Cat B1 n. OK
Indicated Amplitude ratio Exceeded diagnosis range Test time of TWC diagnosis Diagnostic status
Diagnostic result
Range 0.00-1.00 0-9 00.0-60.0 ---
Specified value 0.00-0.26 0-2 60.0 s Cat B1 OK If "Cat B1 n. OK" is indicated in display field 4:

- Check DTC memory page 01
-16
.
If specified value "Cat B1 OK" is indicated in
display field 4:

- Continue to hold engine speed at 1800-2200
RPM.

- Press button -3- once to advance to display
group number 47.
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System in Basic Setting 47
1
2
3
4

Indicated on display (1-4 display fields)
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01-85

- Hold engine speed at 1800-2200 RPM until
display changes from "Test OFF" to "Test ON" in
display field 4.

- Continue to hold at 1800-2200 RPM until
specified value "Cat B2 OK" is indicated in
display field 4.

Note:
The test time for TWC diagnosis is approx. 60
seconds.

Display fields

1 2 3 4
Display group 47: Three Way Catalytic Converter (TWC), Bank 2 diagnosis
Display x.xx x xx.x s Test OFF/Test ON
Cat B2 OK/
Cat B2 n. OK
Indicated Amplitude ratio Exceeded diagnosis range Test time of TWC diagnosis Diagnostic status
Diagnostic result
Range 0.00-1.00 0-9 00.0-60.0 ---
Specified value 0.00-0.26 0-2 60.0 s Cat B2 OK
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