1996 AUDI A4 sensor

01-184
Notes on display field 3

The oxygen sensor learning requirement diagnosis shows what oxygen sensor learning value was checked in the learning
process.
If diagnosis is successful, the corresponding value is set to "1", independently of whether the diagnosis was recognized as
OK or not OK.
If an "oxygen sensor learning requirement diagnosis" value is set to "1" in display field 3, but the corresponding value of
the "oxygen sensor learning requirement display" is not set to "1" in display field 4, the diagnosis was carried out but not
recognized as OK by the Engine Control Module (ECM). The " oxygen sensor learning requirement diagnosis" is now
continued.
The oxygen sensor learning requirement diagnosis is reset to "0" every time there is a start with a coolant temperature
less than 40 C (104 F).
X
X
X
X
X
X
X
X
Meaning of 8-digit oxygen sensor learning requirement diagnosis

1 = Idle (bank 1)

2 = Idle (bank 2)

3 = Partial throttle 1 (bank 1)

4 = Partial throttle 1 (bank 2)

5 = Partial throttle 2 (bank 1)

6 = Partial throttle 2 (bank 2)

7 = Partial throttle 3 (bank 1)
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01-185
Notes on display field 4
Display field 4 (learning requirement display) shows the learning range (display field 2) for which learning is required.
Requirement for learning:

No malfunction stored in DTC memory
Engine speed at idle 650-900 RPM and/or 1500-3000 RPM
Coolant temperature 80-110 C (176-230 F) (if learning does not start immediately after this requirement, step on the
throttle).
Learning is prohibited:

With uneven idle (hunting), during acceleration, at wide open throttle
If malfunctions are stored in the DTC memory (not with sporadic malfunctions)
If differences of 9% are obtained between the richest and leanest oxygen sensor learning value of one display group. If a
9% difference is obtained, continued learning of the learning range involved is discontinued. The learning requirement
display of this learning range can not be 1 display groups 005 and/or 006.
Learning starts 20 sec. after initiation of "Basic Setting" function 04 and/or 2 to 4 min. after each start at a which the coolant
temperature is less than 40 C (104 F). The following listing shows when the request for new learning (learning requirement) is forced:
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During "Basic Setting" function 04 with VAG 1551 scan tool and/or each time the DTC memory is erased, all learning
requirement displays are set to 0 in order to force new learning of the oxygen sensor learning values after the shop visit.
At each start, coolant temperature less than 40 C (104 F), the learning requirement is forced in all learning ranges. If there is a large learning value deviation (from the stored learning value to the newly learned value) in the learning
process, all learning requirement displays are reset to 0.
If there is successful learning, the learning requirement values of the respective learning ranges (display field 2) are set to 1.
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01-186

X
X
X
X
X
X
X
X
Meaning of 8-digit oxygen sensor learning requirement display

1 = Idle (bank 1)

2 = Idle (bank 2)

3 = Partial throttle 1 (bank 1)

4 = Partial throttle 1 (bank 2)

5 = Partial throttle 2 (bank 1)

6 = Partial throttle 2 (bank 2)

7 = Partial throttle 3 (bank 1)

8 = Partial throttle 3 (bank 2) Display value "0" = Request for new learning.
Display value "1" = Learning process ended.
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01-187
Display group 009 Display shows
Specified display value
Designation
Basic setting 9
1 2 3 4 ... % 1 = Oxygen sensor control (bank 1)
... % 2 = Oxygen sensor control (bank 2)
0 - 99% 3 = Duty cycle (triggering)-EVAP canister purge regulator valve -N80-
0% and/or greater than 95% 4 = Throttle angle - at idle: 0%; at wide open throttle: > 95% Note:
The oxygen sensor control should always be evaluated only after successful learning ( learning requirement display, display
group 007 and/or 008, display field 4) in both "Basic Setting" function 04 and "Read Measuring Value Block" function 08.
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01-189
Display group 010 Display
shows Specified display value
Designation
Basic setting
10
1 2 3 4 Difference between display values 1 and 2
less than 8% 1 = Total of oxygen sensor control (bank 1) and momentary
oxygen sensor learning value (bank 1)
2 = Total of oxygen sensor control (bank 2) and momentary
oxygen sensor learning value (bank 2)

At times greater than 0.6 V and/or less than
0.3 V (display must fluctuate) 3 = Voltage signal-bank 1 heated oxygen sensor 1
4 = Voltage signal-bank 2 heated oxygen sensor 1 Note:
The total of the oxygen sensor control and oxygen sensor learning value shows the total effect of the oxygen sensor control.
Bank differences can be evaluated directly by comparing display field 1 with display field 2.
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01-190
Test table display group 010 Display
fields Display on VAG 1551 scan tool
Malfunction cause
Malfunction repair
1/2 Difference between display value
1 (bank 1) and display value 2
(bank 2) greater than 8%
Spark plug faultyIntake air leak on one side Fuel injectors faulty - Repair cause
- Check DTC memory page 01
-13

and/or check fuel injectors page 24-
29


Heated Oxygen Sensor
(HO2S) faulty (dirty) - Check DTC memory page 01
-13

and/or display fields 3 and 4

Mechanical engine basic
setting (valve/camshaft
timing) not OK
Repair Manual, 2.8 Liter V6 2V
Engine Mechanical, Engine Code(s): AFC, Repair Group 13
- Check valve/camshaft timing
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01-191

Display
fields Display on VAG 1551 scan tool
Malfunction cause
Malfunction repair
3/4 Display does not fluctuate-constant
between 0.0 - 0.3 V and/or between
0.6 - 0.9 V
Fuel injector faulty- Check fuel injectors page 24
-29

Spark plug faultyLarge intake air leak Engine Coolant Temperature
(ECT) sensor -G62- faulty EVAP canister purge
regulator valve -N80- - Check spark plug
- Repair cause
- Check DTC memory page 01
-13

and/or check -G62-
- Check using output diagnostic test
mode page 01
-145
and/or check -
N80-

Heated Oxygen Sensor
(HO2S) -G39- faulty or dirty Oxygen Sensor (O2S) heater
-Z19- does not function - Check DTC memory page 01
-13

and/or check -G39-
- Check -Z19- page 24
-49

Fuel system pressure too
high or too low - Check fuel pressure regulator and
residual pressure page 24
-20


Constant 2.550 V Short to positive (B+) through:
Heated Oxygen Sensor
(HO2S) -G39- wiring Engine Control Module
(ECM) -J192- - Check -G39- page 24
-49Pa
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