To test a VGT solenoid, measure the resistance across the VGT solenoid coil with a digital multimeter (remove the connector to expose two male pins). The resistance across the solenoid coil should be between 3.42 & 4.18 Ω when engine oil temperature (EOT) is at 73° F. If the resistance reading is out of spec, the solenoid needs to be replaced. Keep in mind that it is much more common to experience stuck/sticking VGT components than it is a faulty VGT solenoid, both of which will hinder turbocharger performance and possibly throw turbocharger related DTCs.
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• Disconnect both negative battery cables.
• The VGT solenoid protrudes from the bearing housing (center section) of the turbocharger. Locate and remove the VGT solenoid electrical connector.
• The VGT solenoid is held in place by a bracket that is secured with a single retaining bolt - remove the bracket bolt with an 8 mm, 12 point socket.
• Pull the solenoid straight outwards while twisting side-to-side as permitted - a reasonable amount of force is required to unseat the series of o-rings on the solenoid valve. Keep the solenoid orientation parallel to its bore, i.e. do not rock it against the bore in the bearing housing.
• Have a clean rag handy in order to catch the solenoid, which will be covered in motor oil.
• Soak the valve and o-rings of the new VGT solenoid in fresh 15W-40 motor oil for several minutes.
• The replacement solenoid includes a new bracket and retaining bolt, so do not reuse the old hardware.
• Make sure the o-rings on the solenoid valve are well lubricated, then install the solenoid in reverse order by pushing it into the bore in the bearing housing until it is seated. The solenoid will have a tendency to push out slightly until the bracket is installed.
• Install the solenoid bracket, lightly coating the retaining bolt with high temperature anti-seize to permit future removal. Torque the retaining bolt to 18 lb-ft.
• Clean the electrical connector using a plastic safe electrical connector/contact cleaner, then reinstall the connector. Do not forget to snap the connector retaining clip into place.