How to Test an Electronic EGR Valve

Written by johnathan cronk
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How to Test an Electronic EGR Valve
Learn how to test the EGR system in your vehicle. (motor image by Petr Efremov from

Electronic EGR systems are used in vehicles to direct the exhaust gases into the intake manifold, where the exhaust is then cooled before entering the combustion chamber. This process works to cool the combustion chamber which, in turn, reduces emissions. When a component within your vehicle begins to fail, the "Check Engine" light will appear. To determine if the EGR is causing the light to appear, learn how to properly test the component.

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  1. 1

    Open the bonnet of your vehicle and locate the EGR valve. The valve is near the intake manifold with a single vacuum hose running to it. The valve has a three-wire electrical connector coming off of it.

  2. 2

    Use your fingers to push on the electrical connector. This will ensure the connector is plugged in all the way as it may have been jolted free when hitting a bump. Turn the engine on and allow the components to warm up for two minutes.

  3. 3

    Examine the electronic EGR valve while the engine continues to warm up and run. You should be able to see the valve's components moving quickly. Depending on your vehicle, you should see a small pin moving back and forth swiftly or a plunger moving up and down quickly. If either component is not moving freely, the EGR needs to be cleaned or replaced immediately.

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