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

Powertrain Management > Computers and Control Systems > Sensors and Switches - Computers and Control Systems > Engine Speed Sensor > Component Information > Testing and Inspection

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Engine Speed Sensor: Testing and Inspection

Diagnostic Procedures

Engine Speed Sensor G28, Checking

Special tools, testers and auxiliary items required

‹› Multimeter.

‹› Wiring diagram.

Test requirements

‹›  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.

‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".

‹› 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.

Start diagnosis

The Engine Speed (RPM) Sensor (G28) detects RPM and reference marks. Without an engine speed signal, the engine will not start. If the engine
speed signal fails while the engine is running, the engine will stall immediately.

Function test

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Connect the scan tool.

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Switch the ignition on.

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Using the scan tool, check the engine speed:

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Switch ignition off.

If the specified value was not obtained:

Checking internal resistance

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Disconnect the Engine Speed (RPM) Sensor (G28) electrical harness connector.

Powertrain Management > Computers and Control Systems > Sensors and Switches - Computers and Control Systems > Engine Speed Sensor > Component Information > Testing and Inspection

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