Golf L4-2.0L (ABA) (1996)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor Control Test: Before Convertor
Special Tools, Testers And Auxiliary Items
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VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
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VAG 1598/i8testbox
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Multimeter (Fluke 83 or equivalent)
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Connector test kit VW 1594
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Wiring diagram
Test Conditions
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Coolant temperature at least 80°C (176°F)
Functional Check
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Engine running at idle
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Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01.
Indicated On Display
Rapid data transfer HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated On Display
Read Measuring Value Block HELP
Input display group number XXX
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Press buttons -0-, -2- and -5- to input display group 025 and press -Q- button to confirm input.
Indicated on display (14 = Display fields).
Read Measuring Value Block 25-->
1 2 3 4
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Check the specifications for O2S control (before three way
catalytic converter) (display fields 1-3).
Display Group 025: Oxygen Sensor Control Before Convertor
Continuation
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If the specification in display field 1 is not attained, or the value does not fluctuate at least 2%:
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Carry out a test drive to remove possible residue on HO2S and repeat check.
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If the the specification in display field 1 is not attained even after a road test, or the value does not fluctuate at least 2%:
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Check O2S heating wiring procedures, listed below.
If the value displayed in display field 1 remains constant:
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Press -C- button.