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volkswagen Workshop Repair Guides


Passat Sedan V6-3.6L (BLV) (2008)

Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > HO2S Front Oxygen Sensor Bank 1 Sensor 1, Checking > Page 965

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Checking internal resistance

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Using a multimeter, check the Oxygen Sensor Heater Bank 2 Sensor 1 (Z28) terminals 3 to 4 for resistance.

Specified value: 2.5 to 10.0 ohms (at approx. 20° C)

If the specification was not obtained:

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Replace HO2S Oxygen Sensor Bank 2 Sensor 1 (G108). Refer to the Repair Information.

If the specification was obtained:

Checking voltage supply

 Switch the ignition on.

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Using a multimeter, check the Oxygen Sensor Heater Bank 2 Sensor 1 (Z28) electrical harness connector terminal to ground for voltage.

Specified value: above 9.50 V.

 Switch the ignition off.

If the specification was not obtained:

-

Check the Oxygen Sensor Heater Bank 2 Sensor 1 (Z28) electrical harness connector terminal 4 to fuse 33 in Fuse Panel B for high resistance, a
short to ground, or an open circuit.

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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 wiring

If the manufacturers test box is being used. Perform the following step.

-

Install the test box.

If the manufacturers test box is not being used. Perform the following step.

-

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

Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > HO2S Front Oxygen Sensor Bank 1 Sensor 1, Checking > Page 965

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