Passat L4-1.8L Turbo (AWM) (2004)
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Set multimeter for resistance measurement and connect it to terminals 1 + 2 at connector for oxygen sensor. Check oxygen sensor heater for
continuity.
Specified value: 0 to 20 ohms
Continued for all vehicles
If an open circuit is found in the oxygen sensor heater:
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Replace Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, item 6
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
Specified value: 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.
Specified value: 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 test box to control module wiring harness, connect test box for wiring test. Engine Control Module (ECM) is not connected. See:
Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/Test Box, Connecting For Wiring Test
Vehicles with engine code AEB