In this article, I'm gonna' show you one of the fastest and easiest ways I have used to diagnose BAD fuel injectors on Nissan vehicles. You don't need any expensive diagnostic equipment to do it... all you need is a multimeter.
In this article I'm gonna' show you how to do a simple resistance test, with a multimeter, to diagnose a fried fuel injector.
Here are the contents of this article at a quick glance:
In my experience, the three major causes of a fuel injector fault/problem are:
This article focuses on the most common, which is when the fuel injector doesn't spray any fuel at all. When this happens, it's because the fuel injector has fried internally.
What really stinks about having a fuel injector go BAD, or get clogged, or stay stuck On all of the time... is that the PCM (Powertrain Control Module = Fuel Injection Computer) doesn't set a specific fuel injector malfunction trouble code.
So, one of the things that you and I have to do, when we suspect a BAD fuel injector, is to do a fuel injector resistance test (and in this tutorial, I'll show you how).
To test the fuel injectors in your 2.4L equipped Nissan Altima, or Frontier, or Xterra, you don't need any expensive tools.
Here's a basic list of tools you'll need:
To get the most accurate test result, from the info presented in this article, you need to test the fuel injectors on your Nissan Altima (or Frontier, Xterra) with the engine warmed up.
Now, in case your car doesn't start (as in it Cranks but Doesn't Start)... doing a fuel injector resistance test probably won't help you. If this is your situation, take a look at this section of this tutorial: My Nissan Doesn't Start.
You'll be using the image in the image viewer to know what fuel injector belongs to what engine cylinder.
OK, this is what you need to do:
To get started, you need to disconnect all 4 fuel injectors from their electrical connectors.
Once all of the fuel injectors are disconnected, test the resistance of each one with your multimeter in Ohms mode. You'll do this by probing the male spade terminals inside the fuel injector with the multimeter's test leads.
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“For instance, on the planet Earth, man had always assumed that he was more
intelligent than dolphins because he had achieved so much —the wheel,
New York, wars and so on —whilst all the dolphins had ever done was
muck about in the water having a good time. But conversely,
the dolphins had always believed that they were far more
intelligent than man —for precisely the same reasons!”
The Hitchhiker's Guide to the Galaxy