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Home >> Volkswagen >> 2012 >> Passat S, 2.5L Eng VIN H, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> 2.5L - Generic Scan Tool - Engine Code(S): CBTA & CBUA >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Oxygen Sensor Heater In Center Catalytic Converter, Checking >> Test Procedure
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Test Procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK 

Start diagnosis

-- Remove the engine cover with air filter. Refer to the Repair Information.

Checking internal resistance

-- Disconnect the Heated Oxygen Sensor (HO2S) -G465- electrical harness connector.

-- Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G465- terminals 1 and 2 for correct resistance.

Specified value: 7.5 to 15.0 Ω (at approx. 20 °C)

If the specified value was Not obtained:

-- Replace the Heated Oxygen Sensor (HO2S) -G465-.

If the specified value was obtained:

Checking voltage supply

-- Turn the ignition switch ON

-- Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G465- electrical harness connector terminal 1 to engine ground for voltage.

Specified value: Battery voltage.

-- Switch the ignition OFF.

If the specified value was Not obtained:

-- Check the wiring for an open, high resistance or short to Ground and replace any open fuse.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking Ground activation

-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G465- electrical harness connector terminal 2 to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminal for an open circuit. Refer to Wiring Diagrams for pin locations.

2009 - 2010 Models

Heated Oxygen Sensor (HO2S) -G465- electrical harness connector terminal: Engine Control Module (ECM) -J623- electrical connector T94 terminal:
2 7

2011 >

Heated Oxygen Sensor (HO2S) -G465- electrical harness connector terminal: Engine Control Module (ECM) -J623- electrical connector T94 terminal:
2 51

Specified value: 1.5 Ω max.

If the specified value was Not obtained:

-- Check the wiring for an open or high resistance.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and the voltage supply was OK:

-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Install the engine cover with air filter. Refer to the Repair Information.

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