Passat L4-1.8L Turbo (AWM) (2004)
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Use adapter cables from (VAG1594) to connect multimeter to terminals 3 + 4 (ECM connector) for voltage measurement.
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Start engine and measure primary voltage.
Specified value: 0.40 to 0.50 Volts
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Switch ignition off.
Vehicles with engine code ATW
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Disconnect 4-pin harness connector (black) to Heated Oxygen Sensor (HO2S) -G39- (-1-).
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Use adapter cables from V.A.G 1594 to connect multimeter to terminals 3 + 4 (ECM connector) for voltage measurement.
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Switch on ignition and measure primary voltage.
Specified value: 0.40 to 0.50 Volts
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Switch ignition off.
Continuation for all vehicles
If specified value is not obtained:
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Test oxygen sensor wires.
If specified value is obtained:
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Replace Heated Oxygen Sensor (HO2S) -G39-before catalytic converter, item 4 .
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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. Refer to "Monitors, Trips and/or Drive Cycle/Readiness Code, Generating".
See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking oxygen sensor wires