coolant temperature AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual

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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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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24-93

Oxygen sensors aging, oxygen sensor
before catalytic converter, checking


Test requirements

Coolant temperature min. 85 C (185 F)
(Display group 004, display field 3)

Test sequence for oxygen sensor 1 before
catalytic converter bank 1

- 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 at idle.
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24-102

Test conditions

Perform road test and do not erase DTC
memory.
Coolant temperature at least 85 C (185 F)
(Display group 004, display field 3)

- 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 -4- to select "display group number 034" and
confirm entry with -Q- button.
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