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Quick Tip: Toyota® EVAP Test

Applies To: ETHOS® PRO, ETHOS® Tech, MODIS Ultra™, SOLUS Edge™, SOLUS Ultra®, VERDICT®, VERUS® Edge, VERUS® PRO, ZEUS®

Vehicle: 2013 Toyota RAV4. Many EVAP system problems can be difficult to test on some vehicles due to how the system is set up. In this Diagnostic Quick Tip, National Field Trainer Jason Gabrenas shows you how to force an EVAP System test on late-model Toyota vehicles using a scan tool.



EVAP problems with vehicles are pretty common and a lot of times they're kind of hard to diagnose.

On a lot of newer vehicles, they use a leak detection pump in order for the computer to detect whether there's an actual EVAP problem with the vehicle.

The problem is on some of these vehicles, like this Toyota behind me, it waits five hours before it turns on that leak detection pump to run a test. So it's really hard to verify whether or not you actually fixed the problem. Now we can force it using a scan tool.

I've already got the vehicle loaded in here so we have to go into the Scanner to do this and then it's under the Engine Control Module and that is it under System Tests right here.

You can either do it manually or automatic. I like things automatic so we'll go into the Automatic Test Mode and then it tells you what it's going to do.

It activates the vent solenoid, the vent valve and the vacuum pump to draw and release vacuum through the system.

System operation can be confirmed by watching the vapor pressure either go up or down during each step.

To make sure you don't damage the system the scan tool will automatically stop the pump when the pressure drops below a certain number. Refer to service manual for information.

Do not operate vent valve and vacuum pump continually for more than 15 minutes. Ensure the vehicle is in park, ignition is on engine not running, fuel temp below 95 degrees and fuel level less than nine tenths of the fuel level.

All of these parameters are important as it won't run the test if any of these are off. Now it wants us to cycle the ignition, so let's go over and do that for ten seconds then continue.

Now we've got to cycle it back on and after a few seconds we're good to go. The scan tool tells us not to hit the brake pedal and not to start the engine.

It's going to pull the data from the vehicle and make sure that all the test parameters are indeed set. It says it can only be activated every key cycle.

So if it's been completed already, make sure you exit. It's only been one key cycle for us so we'll hit continue.

The automatic check will simulate the system monitor. If malfunction is detected, it will set a code.

So this is a good way to force it and make sure that you don't have to wait that five-hour cold soak, they call it a cold soak bypass.

If we hit continue that'll start the test. The test will for last eight to 15 minutes so make sure you have a little bit of time there. Then it'll wait for 10 seconds before it starts to test and we're off and running.

Once it's done the next step is going to allow you to check any codes that may have set. We'll go through there and check the current codes first, nothing there; history codes, nothing there once again, pending codes nothing and permanent codes nothing there as well.

That's a good way to verify that everything is done, everything is complete.

If we back out of there it's going to say, you want to make sure that if there are any codes you want to complete any repairs necessary.

Then we hit continue again and the test is done. That'll save you five hours a week. 

Last Updated: January 1, 2020

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