1996 AUDI A4 sensor

01-61
If the readiness code was not generated,
generate readiness code again Page 01
-62
.

- Check readiness code Page 01
-59
. If DTC
memory has been erased, or ECM has been
disconnected from B+, generate readiness code
again Page 01
-62
.
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 (not applicable / always "0")
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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01-68

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 Measuring Value Block
HELP
Input displa
y group number XXX

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

Indicated on display (1-4 display fields) - Increase engine speed to 1800-2200 RPM.
- Hold at 1800-2200 RPM until:

Specified value of "111" is reached in display field 1
Specified value of "110" is reached in display field 2
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01-69


Display fields

1 2 3 4
Display group 30: Oxygen Sensor (O2S) control operating condition
Display xxx xxx
Indicated Status of Heated Oxygen Sensor (HO2S), bank 1,
before TWC (B1-S1) Status of Heated Oxygen Sensor (HO2S), bank
1, after TWC (B1-S2)
Specified
value 111 110 ---
---


Evaluation Page 01
-70

Evaluation Page 01
-70


If the specified values are not indicated:

- Check DTC memory Page 01
-15
.
If the specified values are indicated in display
fields 1 and 2:

- Continue to hold engine speed at 1800-2200
RPM.
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01-70

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

Note:
O2S control for bank 1 Oxygen Sensor (O2S)
after Three Way Catalytic Converter (TWC), B1-
S2), is not active at idle.
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01-71

Step 6: Oxygen sensor aging (time period)

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

- Press -3- button 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.
- Continue to hold at 1800-2200 RPM until specified value "B1-S1. OK"
is indicated in display field 4.
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01-72


Display fields

1 2 3 4
Display group 34: Oxygen sensor aging (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 Heated Oxygen Sensor
(O2S) before TWC Diagnostic status
Diagnostic result
Range 0-6800 RPM 0.00-8.50
ms 0.00-5.00 s ---
Specified
value 1800-2200 RPM 0.80-2.00
ms 0.00-3.30 s B1-S1 OK If "B1-S1 n. OK" is indicated in display field 4:

- Check DTC memory Page 01
-15
.
If the specified value "B1-S1 OK" is indicated in
display field 4:

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

- Press -C- button.
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01-76


Display fields

1 2 3 4
Display group 70: Evaporative Emissions (EVAP) canister purge regulator valve
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 Oxygen sensor control
deviation during diagnosis Diagnostic
status
Diagnostic
result
Range 0-100 % -25.0 to 25.0 % -2.70 to 4.16 g/s ---
Specified
value 0-100 % - 5.4 to 9.4 % 0.00 to 0.33 g/s EVAP OK If "EVAP n. OK" is indicated in display field 4:

- Check DTC memory Page 01
-15
.
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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