Golf L4-2.0L (BEV) (2004)
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Remove protective cover -1- and disconnect 4-pin harness connector (brown) -5- 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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Check oxygen sensor wires.
If specified value is obtained:
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Replace Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- bank 1.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: 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: 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: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting 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 68
Terminal 4 + socket 69
Wire resistance: max. 1.5 Ohms
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Check wires for short circuit to B+ and to Ground (GND).
Specified value: Infinite Ohms
If no malfunctions are found in wires:
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Replace Motronic Engine Control Module (ECM) -J220-.