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To test if a fuel injector is working on a Ford F-150, you can disconnect each injector carefully. Use a multimeter in Ohms mode to test each injector, and the reading should be between 11 and 18. It's also possible for an injector to become blocked with debris or grease, but this is uncommon. If you suspect this issue, it's more challenging to diagnose. You may need to remove the injector from the rail for inspection. It's not advised for inexperienced car enthusiasts to do this, so it's better to have a professional mechanic check the injector at a shop.
You have the option to use an ohm meter to test them electrically, or you can opt to have it checked out at a repair shop.
Unplug the fuel injector, and switch your multimeter to ohms mode. Record the resistance reading, which should fall between 11 and 18 ohms.