display AUDI A4 2000 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-183
Notes on display field 1 (cont'd):
The oxygen sensor control stop evaluation is also done by the diagnosis only after successful learning learning
requirement display:
Control stop max.: + 32%
Control stop min.: - 87.5%
With values of more than 20% in "Basic Setting" function 04, the following malfunctions are possible: Intake air leaks
Engine damage (oil burning with faulty piston)
Notes on display field 2:
In display field 2 (learning range display), the momentary learning range (load status) is displayed. Only idle and partial
throttle learning ranges are displayed since, at wide open throttle, no learning takes place.
In order to reach the corresponding learning range (load status):
Idle: the vehicle should be allowed to run at idle (650-900 RPM)
Partial throttle 1, 2 or 3: during test drive (with second person), increase engine speed to 1500-3000 RPM and generate
load by lightly operating the brake
X
X
X
X
Meaning of 4-digit learning range display
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1 = Idle

2 = Partial throttle 1

3 = Partial throttle 2

4 = Partial throttle 3 Display value "0" = Engine speed and/or engine speed and load for this learning range not obtained.
Display value "1" = Engine speed and/or engine speed and load for this learning range obtained.
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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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8 = Partial throttle 3 (bank 2)

Display value "0" = Diagnosis not carried out yet.
Display value "1" = Diagnosis complete.
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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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01-188
Test table display group 009 Display fields
Display on VAG 1551 scan tool
Malfunction cause
Malfunction repair
1 -
- Display group 007, display field 1
2 -
- Display group 008, display field 13 -
- Note4 -
- Display group 003, display field 3
Notes on display field 3:

The evaporative emissions valve (EVAP canister valve) is closed during the learning process.
The effect of the EVAP canister can be evaluated by comparing the display value during "Basic setting" (EVAP canister
completely closed: 99%) and during "Read Measuring Value Block" (EVAP canister valve completely open: 0%).
You can switch back and forth between "Basic Setting" function 04 and "Read Measuring Value Block" function 08 by
pressing buttons -1- and -3- on VAG 1551 scan tool.
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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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