Jetta Sedan L5-2.5L (CBTA) (2009)
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Exhaust system between catalytic converter and cylinder head properly sealed.
‹› Coolant Temperature at least 80 °C.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
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Connect scan tool.
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Start the engine and let it run at idle.
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Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
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Select "Monitor-ID $01: Oxygen sensor monitoring before catalytic converter".
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Select "Test-ID $83: Dynamic test".
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Check the specified values at idle.
If specified values are obtained:
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End diagnosis and switch the ignition off.
If the specified values are not obtained:
Checking primary voltage
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Disconnect the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 1 -.
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Using a multimeter, connect the negative lead to engine ground. Check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector