Jetta Sedan L5-2.5L (CBTA) (2009)
If the specification was obtained:
Checking voltage supply
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Turn the ignition switch ON
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminal
1 to engine ground.
Specified value: Battery voltage.
If the specification was not obtained:
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Check the wiring for an open, high resistance, short circuit to each other, or Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminal
2 to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T121 terminal 6 for an open circuit according to the wiring
diagram.
Specified value: 1.5 ohms max.
If the specification was not obtained:
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Check the wiring for an open or high resistance.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK: