How to Test a Car Purge Valve with a Multimeter?

How to Check Evap Purge Valve

How to Check Evap Purge Valve? Evaporative emission control, or Evap for short, is a crucial feature of today’s automobiles. The Evap purge valve is an integral component of this system because it regulates the passage of gasoline vapor from the charcoal canister to the engine intake manifold.

The efficiency of the Evap system can degrade over time if the purge valve develops a malfunction or becomes clogged. In this post, we will provide a detailed tutorial on ‘How to Check Evap Purge Valve”, to keep your car’s exhaust system in top shape.

How to Use the Evap Purge Valve?

Understanding the purpose of the Evap purge valve is necessary before beginning the testing procedure. The purge valve controls the amount of fuel vapor that enters the intake manifold of the engine, where it is burned. The vehicle’s engine control module (ECM), which keeps tabs on things like engine load and temperature, sends signals to open and close it.

Gathering the Necessary Tools

You’ll need a few key items to properly test the evap purge valve. Among these are goggles, a multimeter, a vacuum pump, a gauge, and some wrenches. To get the job done right and save the car from getting dinged up, you need the right equipment.

Identifying the Purge Valve

The initial step is to find the evap purge valve. The valve is normally located on the intake manifold or the charcoal canister close to the motor. Find out where the purge valve is by consulting the service manual or going online.

Visual Inspection

Checking the purge valve and its hoses visually for damage, leaks, and loose connections is the first step in the testing process. Check that all of the wires and plugs are securely in place. During this check, cracks or leaks in the purge valve could indicate the need for a replacement.

Testing the Purge Valve

The purge valve’s electrical continuity can be tested with a digital multimeter. Unplug the valve’s power source and connect the multimeter’s probes to the pins. To find out what resistance values you should be expecting and which pins to use, you should consult your car’s service manual. The purge valve may be broken if the measured resistance is too high or too low.

Connect a hand vacuum pump to the purge valve and test for vacuum operation. Check to see if the valve behaves as intended by opening and closing. The vacuum pressure can also be measured with a vacuum gauge. The valve could be broken if it doesn’t open or close properly or if it leaks vacuum.

Replacing the Purge Valve

The purge valve should be replaced if it does not pass any of the tests or if any damage can be seen by the naked eye. To learn how to do a replacement on your vehicle, check the service manual. Always use a valve that is designed to work with your unique vehicle.


In this article, we will explore “How to Check Evap Purge Valve?”.Maintaining the efficacy and effectiveness of the Evap system requires routine inspection and testing of the purge valve. The purge valve’s condition can be determined and fixed with ease if you follow the article’s detailed instructions.

Remember that keeping your car’s Evap purge valve in good working order helps keep your vehicle ecologically friendly by reducing emissions. Consult a professional auto mechanic if you have any doubts or concerns about doing the tests on your own.

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