engine AUDI A4 1996 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

Notes on display field 3:

The mechanical Closed Throttle Position (CTP) switch must be closed for the testing on the Throttle position sensor
learning values display field 4. If the displays in display fields 2 and 3 match at idle, the learning process is OK. If no learning process takes place, the
last value learned will be displayed continuously.
If engine control module is without power, the throttle position sensor learning value will be set to 0.550 V.
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Display group 003 Display shows
Display/specified value
Designation
Basic setting 3
1 2 3 4 650 - 750 RPM 1 = Momentary idle speed
15.0 - 35.0% 2 = Engine load idle1)
0% and/or greater than 95% 3 = Throttle angle - at idle: 0%; at wide open throttle: > 95%
... km/h 4 = Momentary vehicle speed 1) Evaluate engine load tolerance range only at idle during "Basic Setting" function 04.
Note on display field 1:
Idle speed on vehicles without A/C and rear windshield heater switched on: 750-850 RPM.
Notes on display field 3:
For the testing at wide open throttle, stop engine, and switch ignition on.
Since in vehicles with manual transmission and automatic transmission different throttle bodies are installed, the start of
opening of the throttle body can be measured with ignition on and thus incorrect installation can be checked
Manual transmission: 45-53%
Automatic transmission: 27-35%
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Display
field Display on VAG
1551 scan tool Malfunction cause
Malfunction repair
3 Greater than 0%
at idle
Throttle position sensor -G69- faultyAccelerator pedal cable adjustmentThrottle sticks
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20
- Check DTC memory page 01
-13
and/or
display group 002
- Adjust accelerator pedal cable:- Repair cause
At wide open
throttle less than
95%
Throttle position sensor -G69- faultyAccelerator pedal cable adjustment Throttle position sensor -G69- incorrectly
adjusted
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20
- Check DTC memory page 01
-13
and/or
display group 002
- Adjust accelerator pedal cable:- Check and adjust sensor -G69- Repair
Group 24
4 No display
Wiring connection between instrument
panel insert and Engine Control Module
(ECM) -J192- faulty Open circuit or short between Vehicle
Speed Sensor (VSS) -G68- and -J192- - Electrical Wiring Diagrams, - Check vehicle speed signal page 24
-97
- Check -G68- check vehicle speed
sensor:
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01-173
Display group 004 Display
shows Display/specified
value Designation
Basic
setting 4
1 2 3 4 0 2
1 = Idle air control valve at idle
HS: +14 to -16
or
AT: +10 to -20 2 = Idle speed control learning value in manual transmission (HS) at idle setting and/or
with automatic transmission (AT) in selector lever setting P or N
Variation permitted for new engines:
HS: +20 to -16AT: +16 to -20)
HS: 0
or
AT: +10 to -20 3 = Idle speed control learning value in automatic transmission (AT) in selector lever
setting D, 1, 2, 3 or R. (0 is always displayed in vehicles with manual transmission.)
001 10 4 = Shift inputs at idle:
0 off 1 on
Notes:

Values in display fields 2 and/or 3 can only be evaluated with idle air control valve is within tolerance at idle (display value
1). If the idle air control valve is not within tolerance after 1 minute waiting time, no learning takes place in display fields 2
and/or 3 .
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Display
field Display on VAG 1551
scan tool Malfunction cause
Malfunction repair
4 Not 001 10
Closed Throttle Position (CTP) switch -F60 activated or faulty A/C compressor switched on Rear window heating switched on Driving mode selected (automatic
transmission) - Check and adjust -F60- page 24
-
73

- Switch A/C off
- Check A/C compressor shut-off
page 24
-90

- Move selector lever to P or N
Note:
Display field 4 (shift inputs) can be used to recognize whether the components described below are recognized by the Engine
Control Module (ECM) as switched on or off. Display group 023 gives an exact description of the shift inputs. 0
0
1

1
0
Meaning of 5-digit shift inputs

1 = Shifting Signal (0 = not active / 1 = active)

2 = Gear recognition signal (always "1" except that display = "0" for automatic transmission vehicles with
gear engaged)

3 = -----------

4 = Mechanical Closed Throttle Position (CTP) switch (1 = closed / 0 = open)

5 = A/C compressor OFF/ON (0 = off, 1 = on)

6 = Rear window heater signal (always "0" except for vehicles without A/C and with rear window heater
on)
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Notes on display groups 005 and 006:
If there are differences in oxygen sensor learning values ( display group 010, display fields 1 and 2 ) of more than 8%
between display group 005 (bank 1) and display group 006 (bank 2), the following malfunctions are possible:
Spark plugs faulty
Fuel injectors faulty (leaking, plugged)
Intake air leak on one side
Heated Oxygen Sensor (HO2S) faulty, dirty
Mechanical engine basic settings (valve/camshaft timing) not OK
If a difference of 9% is reached between the richest and leanest oxygen sensor learning value of one display group, further
learning will be discontinued in the two affected learning ranges ( display group 007 and/or 008). Learning requirements
display ( display groups 007 and/or 008) of these learning ranges cannot be 1.
If there is no power to the engine control module, all values are set back to 0.0%.
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Test table display group 007 and/or display group 008 Display
fields Display on VAG 1551
scan tool Malfunction cause
Malfunction repair
1 Outside tolerance range
Minus (-) display: engine too rich
Positive display: engine too lean ("+" is not
displayed)
Possible causes:
Effect: O2S control leans mixture Effect: O2S control enriches mixtureIntake air leakFuel injector faultySuccessful learning has not taken place (
display field 4) O2S learning value at stop ( display
groups 005 and/or 006)
- Wait 30 sec. until the display
has stabilized
2 - Notes
3 - Notes 4 - Notes
Notes on display field 1:
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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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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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