coolant temperature AUDI A4 1995 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual
Page 2 of 46
24-72
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.
Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic setting".
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Page 14 of 46
24-84
Oxygen sensor aging, oxygen sensor
before catalytic converter, checking
Special Tools and Equipment
VAG1788/10 RPM adjuster
Test requirement:
VAS5051 with VAG5051/1Coolant Temperature at least 80 C.
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Page 20 of 46
24-90
Test requirements:
Coolant Temperature at least 80 C.
Fuse for oxygen sensor heating OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Test sequence
Note:
Coolant reservoir screws must be removed and coolant reservoir must be
placed to side in order to access the harness connector. The coolant
hoses can remain connected. - Disconnect 6-pin harness connector (black) -2- to Heated Oxygen
Sensor (HO2S) -G39- before catalytic converter.
If specified value is not obtained: - Connect multimeter between terminal 3 and 4 for resistance
measurement.
Specified value at room temperature: 2.5 to 10
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Page 28 of 46
24-96
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 40 of 46
24-108
Test requirements:
Coolant Temperature at least 80 C.
Fuse for oxygen sensor heating OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Test sequence
Note:
Coolant reservoir screws must be removed and coolant reservoir must be
placed to side in order to access the harness connector. The coolant
hoses can remain connected. - Disconnect 4-pin harness connector -1- (brown) to Oxygen Sensor
(O2S) behind Three Way Catalytic Converter (TWC) -G130-.
If specified value is not obtained: - Connect multimeter between terminal 1 and 2 for resistance
measurement.
Specified value at room temperature: 6.4 to 47.5
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