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

Powertrain Management > Computers and Control Systems > Vehicle Speed Sensor > Component Information > Testing and Inspection

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Vehicle Speed Sensor: Testing and Inspection

Diagnostic Procedures

Speed Signal, Checking

Special tools, testers and auxiliary items required

‹› Multimeter.

‹› Wiring diagram.

Test requirements

‹› The Speedometer (G21) OK.

‹›  The Motronic Engine Control Module (ECM) (J623) fuses OK.

‹› Battery voltage at least 12.5 volts.

‹› All electrical consumers such as, lights and rear window defroster, switched off.

‹› A/C switched off.

‹› Ground connections between engine/transmission/chassis OK.

‹› Ignition switched off.

Test procedure

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Observe safety precautions. Refer to => [ Safety Precautions ] See: Service Precautions/Safety Precautions

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Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] See: Service Precautions/Clean Working Conditions

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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check.

Function test

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Connect the scan tool.

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Perform a road test with a vehicle speed greater than 5 Km/h.

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Using the scan tool, Check the vehicle speed:

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Compare the vehicle speed on the scan tool to the Speedometer (G21).

Specified value: a difference of no greater than 10%.

If the specified value was not obtained or no speed was displayed: 

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Check the wiring from the Motronic Engine Control Module (ECM) (J623) to the Instrument Cluster Control Module (J285) for an open circuit,
Short to Battery (+), or to ground.

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Check the wiring connection for damage, corrosion, loose or broken terminals.

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If necessary, repair the faulty wiring connection.

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Assembly is performed in the reverse of the removal.

Final procedures

Powertrain Management > Computers and Control Systems > Vehicle Speed Sensor > Component Information > Testing and Inspection

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