volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Turbocharger Vacuum Diaphragm, Checking|Page 3109 > < Turbocharger Vacuum Diaphragm, Checking|Page 3107
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Wastegate Actuator: Testing and Inspection
Wastegate Bypass Regulator Valve, Checking

Wastegate Bypass Regulator Valve, Checking

Special tools, testers and auxiliary items required

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Multimeter.

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Wiring diagram.

Test requirements

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Fuse SB12OK.

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The Engine Component Power Supply Relay J757 OK.

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Battery voltage at least 12.5 volts.

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

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On vehicles with automatic transmission, selector lever in position "P" or "N".

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A/C switched off.

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Ground (GND) connections between engine/transmission/chassis OK.

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Ignition switched off.

NOTE:  Voltage for the Turbocharger Recirculating Valve N249 is supplied by the Engine Component Power Supply Relay J757.

Test procedure

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Perform a preliminary check to verify the customers complaint.  See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check

Start diagnosis

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Remove the engine cover with air filter.

Checking internal resistance

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Disconnect the Wastegate Bypass Regulator Valve N75 electrical harness connector - 1 -.

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Using a multimeter, check the Wastegate Bypass Regulator Valve N75 terminals 1 to 2 for resistance.

Specified value: 20 to 30 Ohms (at approx. 20 degrees C)

If the specification was not obtained:

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Replace the Wastegate Bypass Regulator Valve N75.

Turbocharger Vacuum Diaphragm, Checking|Page 3109 > < Turbocharger Vacuum Diaphragm, Checking|Page 3107