AUDI A4 1998 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

020/021 Basic setting
20/21
1 2 3 4 Secondary air injection (AIR) system diagnosis (only for vehicles with secondary air
injection system)
022 Basic setting 22
1 2 3 4 Traction control (only used for vehicles with traction control)
023 Basic setting 23
1 2 3 4 Additional signals
024 Basic setting 24
1 2 3 4 Not assigned
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01-160

Display
group Display
shows Designation
025 Basic setting
25
1 2 3 4 Used only for production and not for customer service
026 Basic setting
26
1 2 3 4 Used only for production and not for customer service
027 Basic setting
27
1 2 3 4 Fuel level display
028 Basic setting
28
1 2 3 4 Used only for production and not for customer service
029 Basic setting
29
1 2 3 4 Diagnostic status (readiness code)
030 Basic setting
30
1 2 3 4 Evaporative emissions (EVAP) system diagnosis (only on vehicles with sensor for EVAP
canister -G172-)
031 Basic setting
31 Operating conditions when combustion misfiring recognized
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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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01-162

099 Basic setting 99
1 2 3 4 1 = Momentary engine speed
2 = Momentary engine load
3 = Coolant temperature
4 = Oxygen sensor control OFF/ON Note:
Display group 99 can switch the oxygen sensor control on or off.
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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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Note on display field 8:
Deviations in display field 8 should only be considered after the oxygen sensor learning process at idle has been completed
display field 9.
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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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01-165
Display group 001 Display shows
Display/specified value
Designation
Basic setting 1
1 2 3 4 85-110 C
1 = Coolant temperature
1.450-1.580 V2) 2 = Mass Air Flow (MAF) sensor1) output voltage
0 - 255 3 = Altitude display
12.000 - 14.000 V 4 = Engine Control Module (ECM) voltage supply battery voltage
1) specified value minus 0.01 V per 500 m above sea level. 2) Mass Air Flow (MAF) sensor output voltage tolerance range can only be evaluated during basic setting at idle.
Note on display field 3:
The altitude display is a calculated value inside the engine control module that is calculated by a comparison of the intake air
mass and the throttle angle.
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