Passat L4-1.8L Turbo (AWM) (2004)
If a short circuit is found in the oxygen sensor heater:
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Replace Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-.
If oxygen sensor heater has continuity:
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Check voltage supply and wiring
Checking voltage supply and wiring
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Set multimeter for voltage measurement and connect it to terminals 1 + 2 at connector to control module.
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Start engine, and let run at idle.
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Measure voltage supply and observe display group 41, display field 4. Indication Htng.beh.cat.ON: Specification: 11.0 to 14.5 volts. Indication
htng.beh.cat.ON/htng.beh.cat.OFF (alternating): Specification: oscillating between 0.0 and 12.0 V
If there is no voltage:
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Connect multimeter to terminal 1 of connector and engine Ground (GND) for voltage measurement.
Specification: 11 to 15 V
If there is no voltage again:
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Check wire connection from terminal 1 to Fuel Pump (FP) relay -J17- according to wiring diagram.
If voltage was approximately same as battery voltage:
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Switch ignition off.
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Connect VAG 1598/31 adapter cable to control module wiring harness. Engine Control Module (ECM) is not connected.