ESP AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection User Guide

No
- Erase DTC memory, test drive and after test
drive, check DTC memory again

Was the control llimit
reached on 3 cylinders in one
bank? P1335, P1326, P1327 or
P1328, P1329, P1330 are in
the DTC memory.
No
Continued next page
Yes

- Knock Sensor for corresponding bank (-G61- or
-G66-) loose and/or tightening torque not OK;
check mounting of Knock Sensors (KS) 1 -G61-
and/or 2 -G66- and retighten if necessary use
insert 3247; tightening torque 20 Nm (15 ft lb) - Abnormal engine noises (e.g. subassemblies
loose) check - Open circuit/loose connection in wiring of
corresponding knock sensor or knock sensor
faulty check Knock Sensors (KS) 1 -G61- and
2 -G66- page 28
-29

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No
- Erase DTC memory, test drive and after test
drive, check DTC memory again

Was the control limit
reached on 3 cylinders of one
bank? P1335, P1326, P1327
or P1328, P1329, P1330 in the
DTC memory.
No
Continued next page
Yes

- Knock Sensor for corresponding bank (-G61- or
-G66-) loose and/or tightening torque OK; check
mounting of Knock Sensors (KS) 1 -G61- and/or 2
-G66- and retighten if necessary use insert
3247; tightening torque 20 Nm (15 ft lb) - Abnormal engine noises (e.g. subassemblies
loose) check - Open circuit/loose connection in the wiring of the
corresponding knock sensor or knock sensor
faulty Check Knock Sensors (KS) 1 -G61- and
2 -G66- page 28
-29

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1 2 3 4
032 Basic setting
32
1 2 3 4 Largest and smallest flank rise and flank fall time (response time) of bank 1 heated oxygen
sensor voltage signal
033 Basic setting
33
1 2 3 4 Largest and smallest flank rise and flank fall time (response time) of bank 2 heated oxygen
sensor voltage signal
034 Basic setting
34
1 2 3 4 Number of flank rise and/or flank fall checks
035 Basic setting
35
1 2 3 4 Three way catalytic convertor diagnosis, bank 1
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01-161

Display
group Display
shows Designation
036 Basic
setting 36
1 2 3 4 Three way catalytic convertor diagnosis, bank 2
037 Basic
setting 37
1 2 3 4 Sensor wheel learning value
038 Basic
setting 38
1 2 3 4 Current data on combustion misfiring recognition
039 Basic
setting 39
1 2 3 4 Statistical data on combustion misfiring recognition
040 Basic
setting 40
1 2 3 4 Heating current of heated oxygen sensors in front of and behind three way catalytic convertors
041 Basic
setting 41
1 2 3 4 Voltage signals of heated oxygen sensors in front of and behind three way catalytic convertor
042 Basic
setting 42 Diagnostic conditions for diagnosing the flank rise and flank fall time (response time) of the
voltage signals of the heated oxygen sensors in front of three way catalytic convertors
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1 2 3 4
043 Basic
setting 43
1 2 3 4 Current flank rise and flank fall time (response time) of the voltage signals of the heated oxygen
sensors in front of three way catalytic convertors
044 Basic
setting 44
1 2 3 4 Conditions for three way catalytic convertor diagnosis (bank 1 and bank 2)
045 Basic
setting 45
1 2 3 4 Evaporative emissions (EVAP) system/tank diagnosis (only on vehicles with diagnosis pump for
fuel system -V144-)
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01-163
Display group 000
Note:
If the values displayed do not correspond to the specified values, the following display groups 001 to 010 can be used to
repair malfunctions. Display
field Specified
display value Corresponds to
physical values Designation and conversion to physical values
1 135 - 160
85 - 110 C
Momentary coolant temperature, display -50 = ___ C
2 145 - 158 1.45 - 1.58 V Mass Air Flow (MAF) sensor output voltage, display: 100 = 1 V
3 26-30 650-750 RPM Momentary engine speed, display X 25 = ____RPM
4 0 - 14
or
255 - 240 Idle speed control learning value, with manual transmission in idle
position and/or with automatic transmission with selector lever setting
P or N (average = 0)
5 0 -10
or
255 - 236 Idle speed control learning value, with automatic transmission in
selector lever setting D 1, 2, 3 or R (average = 0)
(On manual transmission vehicles, 0 is always displayed.)
6 126 - 130 Idle speed control feedback (average 128)
7 20 Shift inputs
8 120-136 Oxygen sensor control (average 128/cylinders 1 to 3) "0" is always
displayed on engines without oxygen sensor probe.
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01-164

Display
field Specified display
value Corresponds to physical
values Designation and conversion to physical values
9 3 Oxygen sensor learning requirement at idle and partial
throttle range,
0 = Oxygen sensor learning requirement at idle and
partial throttle range
3 = Oxygen sensor learning process at idle completed
10 50 - 100 250 - 500 mV Throttle Position (TP) sensor -G69- learning value,
display X 5 = ...mV Note on display field 9:
If specified display values are greater than 3, display groups 007 and/or 008.
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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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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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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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