sensor AUDI A4 1997 B5 / 1.G AHA Engine Readiness Code Workshop Manual

01-72
Explanation of 8-digit readiness code Readiness code is generated only when all display values = 0 1
2
3
4
5
6
7
8
Diagnosis
0 Three Way Catalytic Converter (TWC)
0 TWC heating (not applicable / always "0")
0 EVAP system and fuel tank leak detection test
0 Secondary Air Injection (AIR) system
0 Air conditioning system (diagnosis not applicable / always "0")
0 Oxygen Sensor (O2S) control
0 Oxygen Sensor (O2S) heating
0 Exhaust Gas Recirculation (EGR) system (not applicable / always "0")
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Step 4:

- Start engine and let run at idle.

Step 5: Oxygen Sensor (O2S) control
operating condition Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measurin
g Value Block
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -3- and -0- to input display group number 30 (030),
and press -Q- button to confirm input.
Read Measuring Value Block 30
1
2
3
4

Indicated on display (1-4 display fields)
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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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- 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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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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Display fields

1 2 3 4
Display group 70: Evaporative Emissions (EVAP) canister purge regulator valve diagnosis
Display xxx % xx.x % xx.xx g/s Test
OFF/Test ON
EVAP OK/
EVAP n. OK
Indicated Opening of EVAP canister purge
regulator valve during diagnosis Oxygen sensor control
deviation during diagnosis Idle Air Control (IAC) valve
deviation during diagnosis Diagnostic
status
Diagnostic
result
Range 0 - 100 % -25.0 to +25.0 % -2.78 to +2.85 g/s ---
Specified
value 0 - 93 % -15.0 to +15.0 % -1.00 to 0.00 g/s EVAP OK If "EVAP n. OK" is indicated in display field 4:

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

- Press -3- button to input display group number
71.
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