1997 AUDI A4 AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

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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01-166
Test table display group 001 Display
field Display on
VAG 1551 scan
tool Malfunction cause
Malfunction repair
1 Greater than
110
or
Less than 85
Engine Coolant Temperature (ECT)
sensor -G62-
Wiring connection to Engine Control
Module (ECM) -J192-
Coolant thermostat faulty
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 19
- Check DTC memory page 01
-13
- Check -G62- page 28
-25
- Check engine coolant thermostat
2 Less than 1.450
V
Large intake air leak between intake
manifold and Mass Air Flow (MAF)
sensor Repair cause
Greater than
1.580 V Electrical consumers on, steering wheel
at end stop, driving mode selected
(automatic transmission)
Tolerance for new engines: - Switch consumers off
- Center steering wheel
- Put selector lever in P or N position
display group 004, display field 4
Max. 1.660 V
When engine speed increases, the display
value increases to 2.500 V, falls to 0.000 V
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and starts to go up again
4 Greater than
14.000 V
or
Less than
12.000 V
Generator faulty
Overvoltage because of starting aid
Poor ground connection to ECM -J192-
Discharged battery
Current draw with ignition off - Check voltage
- Check battery charging status
- Check voltage supply of Engine Control
Module (ECM) Repair Group 28
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