P0453 code.

Have a hard fault on p0453. Need evap wiring diagram to troubleshoot bad connections.

 

Did you check the service manuals link in this thread?

P0453 is too much EVAP pressure, right? Is it possible the EVAP purge/vent valve is maybe not venting as expected? How many miles?

 

210. Code reappears without starting the truck.

 

I'm not as familiar with the V6. If I'm not mistaken, the vent line runs from the tank to the an EVAP/vent solenoid mounted above the bank 1 fuel rail, on top of the manifold. I'd look to see if yours has similar on the V6. I drew up my V8 over here, this is how I believe it's setup but I haven't confirmed it in the FSM. It may be similar on your V6, overall.

Any time you're dealing with a code indicating too much pressure in the EVAP system, that screams to me that either a vent line is clogged, a solenoid or vent/purge valve is clogged or isn't opening. One really crude way to test could simply be to locate the purge/vent and unplug the vent tube from the EVAP vent/solenoid and see if the code goes away, and is replaced with a EVAP code for 'small' leak (P0456?) or 'gross' leak (P0455?). I wouldn't do this until I evaluated the line between the tank and EVAP vent/purge solenoid valve whatever you want to call it though.

I really hate EVAP diagnostics! Please - whatever you do, come back and tell us what you find

But yeah ... I'm accustomed to seeing leak codes, not excess pressure codes. Leaks are a BITCH to figure out. Excess pressure ... I'd take that any day.

EDIT: Just to say, it's also possible if the truck has a tank pressure sensor or a pressure sensor somewhere inline, that's gone bad. But in years of being on here, I haven't seen anyone have issues with a bad pressure sensor. Then again, haven't seen a bad purge/vent valve either. But not as many people with V6 here, so who knows?!!

 

That's what makes me think electric. Seeing how the code refuses to clear. Still, I will check the hose trick for a leak. See what happens.

 

Toyota said mine doesn't have one. Tank pressure sensor. Also, affirmative on my model being kin to unicorns and the sasquatch.

 

Doesn't have a EVAP vent/purge solenoid, or ??

There are a lot of circuit codes that'll throw when an electrical circuit isn't being made. Whether its SRS detecting a squib circuit leak, or, like, P0101 code to indicate an issue with the MAF's circuit. I'd expect to see a circuit code if there was some electrical issue tied to this but maybe I'm nuts. It's also late and I should be sleeping rn.

 

Meanwhile, before I crash, check these two threads:

https://www.tundras.com/threads/p0453-help-obscure-repair-not-canister-assembly-or-ecu.116657/

https://www.tundras.com/threads/another-evap-thread-p0441-only-2004-dc.96592/

 

Thanx.

 

Might be in the thread linked by shifty above but if not, the 1st Gen EWD's can be had at the below link. For 06, there are 2 files, Part 1/2, both are good to have but your issue is concentrated more in Part 1.

Ultimate TUNDRA Wiring Diagrams Collection | Toyota Tundra Forum (tundras.com)

As for the FSM mentioned above, the 05-06 download is for 05 but most only differences are wire colors, which will be correct if you refer to 06 EWD's.

The below pic is from Part 1 of 06 EWD's showing the 3 pins your needing to check for proper voltage/resistance for your !GR/V6 and the attached pdf is the 2 page Diagnostic for P0453 !GR/V6 of how to check the pin outs.

 

Greatly appreciated.

 

Took the entire system out. No more codes. How?

 

Come back and confirm still no codes in a couple hundo miles

But yeah, can't say for sure. EVAP is a sealed system between the tank and manifold. It monitors for specific vacuum/ressure level across the system. Faulty gas cap killing vacuum/pressure? Code. Faulty vent valve killing vacuum/pressure? code. All this just to make sure extra vapors don't vent to atmosphere.

Generally speaking, all EVAP systems are the same, though some work backwards of one another, the end goal is the same. But if the system is gone, unless you find a way to emulate the pressure sensors which detect vacuum/pressure, it should eventually throw codes.

 

Initially the truck was choking out. It sputtered for a few seconds then died. Wouldn't keep running. Changed the fuel pump and no dice. Dumped and cleaned the tank and started running. Then today it stalled again. P0453 was on for a few weeks before all this. Bout ready to give up.

 

UPDATE. After removing the evap system the p0453 code was gone and p0441 replaced it. The p0453 stayed even after clearing but didn't return after unplugging everything. Put it all back in and wtf... no more codes. No more shutter and stalling. Only guess is wiring wasn't getting good connection to the valve and made the truck angry.

 

Hopefully for ya it’s totally gone but kind of surprised with 441 code and not 452 also since it means too low of a voltage, given you had it unplugged. Of course alls well that ends well.

 

You'll know for sure within 20-200 miles. There's a chance it's currently going through a re-learing cycle/readiness check/whatever you want to call it.

 

I have same code P0453, vent line is not plugged, canister is not plugged, checked connector and all voltages and resistances are Ok, I switch leak detection valve to other truck and code came on other truck, decided to buy used good leak detection pump and installed and code still there now I am confused maybe the new leak detection pump is also bad? I tried to delete code with scanner not going I don’t know what else to do…