display AUDI A4 1995 B5 / 1.G AWM Engine Oxygen Sensor Control Checking User Guide
[x] Cancel search | Manufacturer: AUDI, Model Year: 1995, Model line: A4, Model: AUDI A4 1995 B5 / 1.GPages: 46, PDF Size: 0.3 MB
Page 16 of 46
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Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "034" in button field -2- for "display group number 034"
and press Q button to confirm input.
- Use VAG1788/10 RPM adjuster to adjust engine speed to between
2300 and 2800 RPM.
Display on VAS5051:
Note:
This process can take a few minutes. - Check specified value in display field -4-.
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Page 17 of 46
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Display fields
1 2 3 4
Display group 034: Diagnostic oxygen sensor aging
Display xxxx/min
xxx C
x.x
---
Indicated Engine speed
(RPM) Exhaust
temperature Dynamic factor Diagnostic condition
Functional
range
Test OFF
Test ON
B1-S2 OK
B1-S2 not OK
Specified value 2300 to 2800 RPM
larger than 350 C
0.5 to 2.5 B1-S2 OK
Note
If specified value is not obtained Continuation, Page
24
-88
Note for display field 2:
Calculated value from engine speed and engine load.
Note for display fields 3 and 4:
The dynamic factor is a characteristic for oxygen sensor aging. The smaller the dynamic factor, the further the oxygen sensor
aging process has advanced.
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Page 18 of 46
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Continuation
If specified value in display field 3 and 4 is not
obtained:
- Road test vehicle in order to free oxygen sensor
of possible residue and repeat test.
If specified value in display field 3 and 4 is not
obtained, even after road test:
- Replace Heated Oxygen Sensor (HO2S)-G39-
.
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Page 22 of 46
24-91
If specified value is obtained:
- Check voltage supply of oxygen sensor
heating.
Checking voltage supply for oxygen sensor
heating
Note:
When the Engine Control Module (ECM) switches oxygen sensor heating
on and off, it may be observed via the function "read measuring value
block", in display group number 041 display field 2.
If there is no voltage: - Connect multimeter between terminal 3 and 4 for voltage
measurement.
- Start engine.
Specification: approx. battery voltage
- Connect multimeter for voltage measurement as follows.Harness connector
Terminal
Measure to
3 (B+) Vehicle Ground (GND)
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Page 24 of 46
When the Engine Control Module (ECM) switches oxygen sensor heating
on and off, it may be observed via the function "read measuring value
block", in display group number 041 display field 2.
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Page 28 of 46
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Test requirements:
Exhaust system free of leaks.
Coolant Temperature at least 80 C.
Test sequence
- Connect VAS5051 tester Page 01
-7 and
select vehicle system "01 - Engine electronics".
Engine must run at idle for this.
- Install VAG1788/10 RPM adjuster on the
accelerator pedal and raise the engine speed to
2600 RPM.
Test requirement:
Engine running at 2600 RPM.
Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic setting".
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Page 29 of 46
24-97
Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "030" in button field -2- for "display group number 030"
and press Q button to confirm input.
Display on VAS5051:
Note:
"Oxygen sensor status" indicates status of oxygen sensor control and
oxygen sensors. - Check specified value in display field -2-.
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Page 30 of 46
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Display fields
1 2 3 4
Display group 030: Oxygen sensor status
Display X X X
X X X
Indicated Oxygen sensor status, bank 1, sensor 1
Oxygen sensor status bank 2, sensor 1
Functional range 0 = off
1 = on 0 = off
1 = on
Specified value 1 1 1
1 1 0
Note
If specified value is not obtained Page 24
-107
Significance of 3 digit indications in display group 030 X
X
X
Display fields 1 and 2
X Oxygen sensor control: 0= not active; 1 = active
X Operational readiness of oxygen sensor: 0= not active; 1 = active
X Condition of oxygen sensor heater: 0= not active; 1 = active
Notes:
The first position of the 3 digit indication (heating) fluctuates between 0 and 1.
Oxygen sensor control of oxygen sensor after catalytic converter (B1-S2) is not active without engine load.
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Page 31 of 46
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Display on VAS5051:
Checking oxygen sensor control after catalytic converter
Test requirement: - Do not continue test until indication in display field -2- has reached
"110" at least once.
Engine continues to run at 2600 RPM.
-
Click on - button
Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "037" in button field -2- for "display group number 037"
and press -Q- button to confirm input.
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Page 32 of 46
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Display on VAS5051:
- Check oxygen sensor voltage in display field -2-.
- Check oxygen sensor correction value in display field -3- and
diagnostic result in display field -4-.
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