Golf GLS L4-2.0L (AZG) (2001)
Function test
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Select the following output of oxygen sensor signals and check whether the specified values are being reached, Diagnostic mode 5: Check output
of oxygen sensor signals. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/With Generic Scan Tool/Diagnostic Mode 5: Check Output of Oxygen Sensor Signals
If specified values are obtained:
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End diagnosis and switch ignition off.
If specified values are not obtained:
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End diagnosis and let engine continue to run at idle.
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Check primary voltage.
Checking primary voltage
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Unscrew protective cover (arrows) and disconnect 4-pin harness connector (brown) -1- to Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130-.
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Connect multimeter for voltage measurement to terminals 3 + 4 of connector to Engine Control Module (ECM) and measure primary voltage.
Specified value: 0.400 to 0.500 Volts
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Switch ignition off.
If specified value is not obtained:
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Test oxygen sensor wires.
If specified value is obtained:
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Replace Oxygen Sensor (O2S) 2 Bank 1 Behind Three Way Catalytic Converter (TWC) -G130-:
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Vehicles with engine code AEG, item 10,
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Vehicles with engine code AVH, AZG, item 13.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase
Diagnostic Data
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Generate readiness code. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes
Checking oxygen sensor wires
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Connect test box to control module wiring harness, connect test box for wiring test. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box,