Depending on the displacement of your Toyota, there are four or six of the Camry Fuel Injector in your engine bay. These injectors are designed to deliver a set amount of fuel to your combustion chamber, allowing the proper air / fuel mixture in your engine. Over time the Camry fuel injector may become clogged or outright fail.
When this occurs you’re going to notice a problem with your Toyota almost immediately. You may have a hard time starting your Camry, or it maybe won’t idle very well. Engine misfire is sure to follow when one of your injectors decides to go out. Toyota Camry misfire is slightly easier to track down if you have the four cylinder engine.
Today I will be showing you how to test the Camry fuel injector in a 2007 Toyota, and showing you how to test it in a 3.5 2GR-FE as well as the popular 2.4 liter 2AZ-FE.
Of course one of the earliest signs of trouble is your Camry check engine light turning on. This OBDII diagnostic warning light lets you know that your Toyota engine has detected an issue.
To pull out the diagnostic trouble code stored in your computer, you will need to use a OBDII scan tool. If the code comes back as a specific engine misfire trouble code, you can use this guide to test your Camry fuel injector with a digital multimeter.
Common Toyota issues from a bad Camry Fuel Injector
Depending on the severity of your Camry fuel injector failure, you may have a Camry that won’t start or a hard start condition. There’s a few other Toyota Camry issues that will result when your fuel injector goes bad or becomes clogged. Here’s some of the other common Camry problems when your fuel system goes wonky.
- Poor engine performance
- Engine misfire
- Rough Idle
- Difficult to start
- Check Engine Light ON
We will begin the testing guide by showing you how to check a 2.4 liter 2AZ-FE fuel injector. In order to begin testing your fuel injector however, you’ll need to open your hood and find which injector is bad. You can do this by either load balancing your engine and disconnecting spark plugs one at a time, or through a specific OBDII trouble code.
This VVT-i engine lays out the fuel injectors, making it much easier to test than the 3.5 liter Camry.
Take your digital multimeter and turn the dial until you reach the setting to read resistance Ω. You will be measuring the internal resistance of the injector to see if the windings are going bad.
If you know which cylinder is the problematic one, this test will tell you if the injector has gone bad or it’s clogged. In order to begin the testing guide however, you are going to need to remove the 2AZ-FE engine cover.
This engine cover is secured by 10mm bolts, so remove these first to loosen the plastic engine cover. Now lift up and remove the cover to reveal the valve cover and the intake manifold to your 2.4 liter Camry engine.
Now reach back towards the back of your engine bay and disconnect each Camry fuel injector. Gently probe the two pins on the fuel injector with either lead of your multimeter. Don’t worry about which lead goes where for this part of the test.
If your Camry fuel injector checks out, the internal resistance should fall between 11.6 to 12.4 Ω at 68°F. When the injector checks out internally but you know it’s the root cause of your 2AZ-FE engine misfire, it means the injector has become clogged.
Of course this test is different if you happen to own the 3.5 liter version of the Camry. To test your Camry fuel injector in your 2GR-FE engine, you will be using the multimeter in the same manner. The only problem is however reaching the rear three cylinders will be much more difficult.
Just like the four cylinder version, you’ll need to remove the plastic engine cover to your V6 Camry. Once this is cleared and removed, you will be unplugging the Camry fuel injector just like the four cylinder.
Much like testing the four cylinder version, you will be measuring the internal resistance. If your resistance checks out but you know that the cylinder is a problem one, it’s a sign that your injector is clogged.
Gently probe the fuel injector pins with both of your multimeter leads. The internal winding should provide between 11.6 to 12.4 Ω at 20°C.
If your Toyota fuel injector does not respond with a resistance value that falls between this range, it’s a sign that internally the injector has gone bad. Remove your fuel injector and install a replacement Toyota injector. Depending on whether or not your Toyota is a Federal or California emissions injector, this part number will vary.
Once you’ve installed your replacement Camry fuel injector, you must check your 2.4 or 3.5 liter engine for any possible leaks. Always inspect for leaks at either injector o-ring as well as the fuel rail before finishing up your install. Use your OBDII scan tool to erase your Camry check engine light, and you are now done!
Have any questions about this DIY testing guide? Leave us a comment below and let us know!