p0453 code evaporative pressure sensor high input

Anybody ever run into this? The repair manual says to test the voltage at the sensor, or maybe there's something goofy with the canister, but I wonder if it's something stupid like a gas cap or something.

 

could be a canister

 

That code would tell me to look at the canister, and see if it's got a hole in it, or something. Either that, or the sensor is unplugged.

 

I always get the canister jobs, when they show up. Just my luck, I guess.

I had a guy come in all pissed off, because his 4Runner wouldn't pass emissions. Same code, P0453. I open the hood, fully expecting to spend hours tracking down a small leak, with our smoke machine. I took one look at the canister, and noticed a 3 inch crack down one of the seams. Seems the guy forgot to mention it had been smacked hard enough in the front that the insurance company wanted to total the truck. He refused, and made 'em fix it. Unbelievably stupid.

Don't even get me started on the Mitsu. Evo's we had come in when I was at Tempe Mitsubishi!

 

Thanks for the input, I'll check it out after work,I just hope my truck with 40k doesn't have a hole in the canister. Hopefully it's a sensor.

 

So what is happening on these that a leak can cause a circuit code? That code is only supposed to set if the pressure sensor reads over 4.9 volts for half a second.

 

Most likely, either the canister is broken, or the sensor is unplugged. The 0.5 seconds would be an "at least", or minimum amount of time the sensor would read the 4.9 volts.

From my data, it shows that once you verify that the voltage at the pins is 4.5 - 5.5 volts, you replace the canister. If the voltage is outside of these parameters, you need to start looking for an open circuit, or broken wire. Since wiring problems are almost non-existant on Toyota's, I'd go with a broken canister, or bad sensor.