Golf GL L4-2.0L (AVH) (2002)
Checking oxygen sensor wires
- Connect test box to control module wiring harness, connect test box for wiring test.
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Check wires between test box and 4-pin connector (to control module) for open circuit according to wiring diagram.
Terminal 3 + socket 25
Terminal 4 + socket 26
Wire resistance: max: 1.5 ohms
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Also check wires for short circuit to B+ and Ground (GND).Specified value: infinite ohms
If no malfunctions are found in wires:
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Replace Heated Oxygen Sensor (HO2S) 1 Bank 1 -G39- before catalytic converter, item 9.
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Erase DTC memory of Engine Control Module (ECM), 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
Function test (Vehicles with engine code AVH, AZG)
NOTE: The oxygen sensor before catalytic converter has a static regulation and can be differentiated from the oxygen sensor behind catalytic converter
via a 6-pin connector.
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Select the lambda test results 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
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End diagnosis and switch ignition off.
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Test oxygen sensor wires.
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,
Connecting For Wiring Test
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Unscrew protective cover (arrows) and disconnect 6-pin harness connector (black) -1- to Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter.