display AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1995, Model line: A4, Model: AUDI A4 1995 B5 / 1.GPages: 61, PDF Size: 0.27 MB
Page 4 of 61
24-82
Notes:
For the defined troubleshooting procedure, it is
possible to switch off the oxygen sensor control
by selecting Display Group 99 in "Basic Setting"
mode and to switch it on again by selecting
Display Group 99 in "Read Measuring Value
Block" mode.
After selecting Display Group 99 (either in
"Basic Setting" mode or in "Read Measuring
Value Block" mode) it is possible to switch back
and forth between function 04 ("Basic Setting")
and function 08 "Read Measuring Value Block")
by pressing buttons 4 and 8 on VAG1551 scan
tool.
When exiting the "Basic Setting" mode (function
04) the oxygen sensor control is automatically
switched on again.
Test conditions
Perform road test and do not erase DTC
memory.
Coolant temperature at least 85 C (Display
group 004, display field 3)
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Page 5 of 61
24-83
Checking function
- Connect vehicle diagnostic, testing and
information system VAS5051 or VAG1551 scan
tool and select engine electronics control
module by entering address word "01" Page
01
-9 . When doing this the engine must be at
idle.
Rapid data transfer
HELP
Select function XX
Indicated on display
Note:
During the basic setting the Evaporative Emission (EVAP) canister purge
regulator valve -N80 is closed and the A/C compressor is switched off. - Press buttons -0- and -4- to select function "Basic Setting" and confirm
entry with -Q- button.
Basic Settin
g
Input displa
y group number XXX
Indicated on display
- Press buttons -0-, -3- and -0- to select "display group number 030" and
confirm entry with -Q- button.
System in Basic Setting 30
1
2
3
4
Indicated on display: (1 - 4 display fields) - Check oxygen sensor status in display fields 1 to 4.
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Page 6 of 61
24-84
Note:
The "Oxygen sensor status" display indicates the
status of the oxygen sensor control and oxygen
sensors.
Display fields
1 2 3 4
Display Group 030: Oxygen sensor status at idle speed (coolant temperature at least 85 C)
Display
0 0 0 0 0 0
0 0 0 0 0 0
Indicates
Oxygen sensor status
bank 1, sensor 1 Oxygen sensor status
bank 1, sensor 2 Oxygen sensor status
bank 2, sensor 1 Oxygen sensor status
bank 2, sensor 2
Work range
0 = off
1 = on 0 = off
1 = on 0 = off
1 = on 0 = off
1 = on
Specification
1 1 1 0 1 0
1 1 1 0 1 0
Note
Significance of display Page 24
-85
If specification is obtained, but a malfunction is stored in the DTC memory: Check oxygen sensor
adaptation values and oxygen sensor control Page 24
-86
If specification is not obtained: Check oxygen sensor signal wire and activation Page 24
-122
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Page 7 of 61
24-85
Significance of 3 digit indication in Display Group 30 1
1
1
Display fields 1 through 3
X Oxygen sensor control
0= inactive
1= active
X Operational readiness of oxygen sensor
0= inactive
1= active
X Condition of oxygen sensor heater
0= inactive
1= active
Note:
The oxygen sensor control for oxygen sensors behind the catalytic converter (B1-S2 and B2-S2) are without engine load
at certain operating conditions not active, that means, the third place of oxygen sensor control for oxygen sensors behind
the catalytic converter can fluctuate between 0 and 1.
The first position of the 3 digit display (Heater) fluctuate at certain operating conditions between 0 and 1.
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Page 8 of 61
24-86
Checking oxygen sensor adaptation and
oxygen sensor control
- Connect vehicle diagnostic, testing and
information system VAS5051 or VAG1551 and
select engine electronics control module by
entering address word "01" Page 01
-9. When
doing this the engine must be idling.
Rapid data transfer
HELP
Select function XX
Indicated on display
Note:
During the basic setting the Evaporative Emission (EVAP) canister purge
regulator valve -N80 is closed and the A/C compressor is switched off. - Press buttons -0- and -4- to select function "Basic Setting" and confirm
entry with -Q- button.
Basic Settin
g
Input displa
y group number XXX
Indicated on display
- Press buttons -0-, -3- and -3- to select Display Group 33 and confirm
entry with -Q- button.
System in Basic Setting 33
1
2
3
4
Indicated on display: (1 - 4 display fields)
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Page 9 of 61
24-87
- Check oxygen sensor control in display fields 1
to 4:
Display fields
1 2 3 4
Display Group 33: Oxygen sensor control at idle speed
Display
xx.x %
xx.x V
xx.x %
xx.x V
Indicates
Oxygen sensor control,
bank 1 Oxygen sensor voltage,
bank 1 Oxygen sensor control,
bank 2 Oxygen sensor voltage,
bank 2
Work range
min.: -25.0 %
max.: 25.0 % min.: 0.000 Volt
max.: 1.000 Volt min.: -25.0 %
max.: 25.0 % min.: 0.000 Volt
max.: 1.000 Volt
Specification
-4.0 to 4.0 %
(The value must
fluctuate by 2 %) Between 0.000 and
1.000 V the voltage
should fluctuate -4.0 to 4.0 %
(The value must
fluctuate by 2 %) Between 0.000 and
1.000 V the voltage
should fluctuate
Note
If readout does not
match specification
Page 24
-89
If readout does not
match specification
Page 24
-92
If readout does not
match specification
Page 24
-89
If readout does not
match specification
Page 24
-92
- Press button -C-.
- Press buttons -0-, -3- and -3- to select "display
group number 033" and confirm entry with -Q-
button.
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Page 10 of 61
24-88
System in Basic Setting 32
1
2
3
4
Indicated on display: (1 - 4 display fields) - Check oxygen sensor control in display fields 1 to
4:
Display fields
1 2 3 4
Display Group 32: Oxygen sensor adaptation at idle speed
Display
xx.x %
x.xxx %
xx.x %
x.xxx %
Indicates
Oxygen sensor
adaptation value, bank
1, sensor 1 at idle
(additive) Oxygen sensor
adaptation value, bank
1, sensor 1 at partial
throttle (multiple) Oxygen sensor
adaptation value, bank
2, sensor 1 at idle
(additive) Oxygen sensor
adaptation value, bank 2,
sensor 1 at partial throttle
(multiple)
Range
min.: -25.0 %
max.: 25.0 % min.: -25.0 %
max.: 25.0 % min.: -25.0 %
max.: 25.0 % min.: -25.0 %
max.: 25.0 %
Specification
-4.0 and 4.0 %
can fluctuate slightly -4.0 and 4.0 %
can fluctuate slightly -4.0 and 4.0 %
can fluctuate slightly -4.0 and 4.0 %
can fluctuate slightly
Note
If readout does not
match specification
Page 24
-90
and Page
24
-91
If readout does not
match specification
Page 24
-90
and Page
24
-91
If readout does not
match specification
Page 24
-90
and Page
24
-91
If readout does not
match specification
Page 24
-90
and Page
24
-91
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Page 11 of 61
24-89
If the specified values in display fields 1
and/or 3 do not match the specifications, or if
the readout does not fluctuate by at least 2
%:
- Check oxygen sensor heater Page 24
-114
.
- Check oxygen sensor signal wire and activation
Page 24
-122
.
- Check intake system for leaks and eliminate
false air Page 24
-76
.
- Check fuel pressure regulator Page 24
-33
.
- Fuel return line kinked or plugged.
-
Press button.
- Press button -0- and -6- to select function "End
Output" and confirm with -Q- button.
- Switch ignition off.
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Page 12 of 61
24-90
Evaluation display group 032 Display group 32
Display fields: 1/3
Possible cause
Corrective action
Oxygen sensor adaptation
values in range:
-4.0 to -25.0 %
Oil thinning- Carry out oil change or carry out
road test on highway
Display fields: 2/4
High oil consumption
Oxygen sensor adaptation
values in range:
-4.0 to -25.0 % Mass Air Flow (MAF) Sensor faulty- Check Mass Air Flow (MAF) Sensor
Page 24
-59
EVAP canister purge regulator valve remains in
stuck in open position - Check EVAP canister purge
regulator valve Page 24
-134
Fuel pressure too highFuel return line kinked or pluged- Check fuel pressure regulator
Page 24
-33
- Check fuel return line
Fuel injector leaking- Check fuel injectors Page 24
-39
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Page 13 of 61
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Evaluation display group 032 Display Group 32
Display fields: 1/3
Possible cause
Corrective action
Oxygen sensor adaptation
values in range:
4.0 and 25.0 %
Un-metered air in intake area- Check intake system for un-metered
air and eliminate leaks
Display field: 2/4
Fuel pressure too low- Check fuel pressure regulator Page
24
-33
Oxygen sensor adaptation
values in range:
4.0 - 25.0 %
Oxygen sensor heater faulty- Check oxygen sensor heater Page
24
-114
Injector not opening or only opening partially - Check injectors Page 24
-39
EVAP canister purge regulator valve remains
in stuck in open position - Check EVAP canister purge
regulator valve Page 24
-134
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