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P2420, P0452, P0453 EVAP ECM PCM Charcoal Canister

Discussion in '4th Gen 4Runners (2003-2009)' started by McGyver9, Dec 16, 2021.

  1. Dec 16, 2021 at 1:44 PM
    #1
    McGyver9

    McGyver9 [OP] New Member

    Joined:
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    I searched...I'm a Noob here...please don't hold that against me. Been turning wrenches for 40 years...
    This is on a (new to ME) vehicle '06 V6, that has spent it entire life in the most godforsaken salt-laden, rusted fender flappin' armpit of the country.
    (Upstate NY..NEVER buy a used vehicle from up here! EVER!!!)
    Have been getting these codes for 10 months....fiddling with gas caps and cutting/re-attaching brittle vacuum lines....but NOW it has to pass the communist state of NY inspection. $hit is getting REAL now!

    Had to cut the f'n spare tire off with a grinder, because the lowering cable BS thing is locked up/rusted, to get to this beautiful piece of environmentally friendly engineering....

    4Runner - Google Photos

    I can't believe that I'm the first to have this happen.
    I've spent DAYS in this forum searching...
    NOT new to Forums...I had an '82 VW Corrado G60...the QUEEN (I LOVED her) of gremlins..
    Am I somehow missing this information?

    Also, I'm kind of disappointed that, at this point, nobody has figured out a way to trick the ECM into thinking that everything in the EVAP system is just fine, using a few resistors, RATHER than buying another one of these stupid $700 piece of shiznit "assemblies", from the stealership...
    Because THIS ridiculous expenditure comes up EVERYWHERE!
    As you can see from my photos, simply buying a new POS isn't going to solve my problem...needs a new harness too..

    What's wrong with you guys/tinkers here? [​IMG]:crapstorm:

    Is there anyone here with the 'scan tool' that can tell me "what" the ECM is "looking" for, ("values"..on this wiring harness) when it performs an "evaporative emissions system leak test"? (voltages/ohms of resistance)

    OR, how to trick it into NOT doing a "test" at ALL???
    If you read this article linked below, there are Temp and pressure parameters that need to be met for it to even go into "test mode".
    Would a resistor in any of THESE places (tell it that it's 65 degrees, for instance) do that, or would it throw everything else out of wack??

    Be a Toyota leak detective | 2011-03-29 | Auto Service Professional

    ALL of this said, has anyone else ever cracked one of these open like this before?

    I'm wondering what's going on with these other (three) unaccounted for pins in the plug. (of COURSE one of them are the ones rotted off/see last photo)
    I've traced the 4 obvious interior connections to their pins.
    Have to say, those RD and BK pins don't look like they have made contact in quite a while. Totally black w/ corrosion.
    Obviously the other two, going to the other bit in there, whatever it is, are GONE...

    There is an o-ring'd piece that goes from this cap part (with the pins molded into the cap) into the main body. (labeled in the photos)
    I'm guessing it is the "atmospheric pressure sensor", with maybe a little diaphragm in there with a positional rheostat contact or something?
    It's sealed tight/won't pop off. Don't want to start hacking into it before I find out if anyone else has got into this.

    I can obviously by-pass the "plug" situation on a couple of these, drilling/siliconing/direct wiring them to the harness, but what's up with the other ones?

    Anyone?
    NOT trying to sound like a dik...just trying to be funny...sort-of..
    THIS sucks!

    Thanks in advance guys..and gals!:oldglory:
     
    Last edited: Dec 17, 2021
  2. Dec 16, 2021 at 7:13 PM
    #2
    negusm

    negusm New Member

    Joined:
    Oct 22, 2019
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    Vehicle:
    2002 4Runner SR5 4WD
    P2420 - Evaporative Emission System Switching Valve Control Circuit High
    P0452 indicates that the Evaporative Pressure Sensor is indicating pressure change values that are below specification
    P0453 indicates that the Evaporative Pressure Sensor is indicating pressure change values that are above specification

    Yeah. I feel your pain. I fled the state of NY 20+ years ago. Don 't miss the rust one bit.

    You're probably in uncharted waters because, usually, these Toyota systems rarely break. And in regards to the evap system...it's almost always a leak in the system which is a hose or seal and not the Charcoal canister assembly.

    The Computer will require a test of the EVAP system and pretty sure you can't trick it to not require it, otherwise you can't get the system to be ready for an emissions inspection. You'd have better luck tricking the NYS testing equipment.

    Things are complicated to the point that it's just cheaper\easier to buy the assembly. I replaced mine on my 2002 just because I didn't want to mess with an Evap code anymore as I had to drop the tank and that's no fun. Mine was about $650 retail but I got it for $400 through an on-line discount Toyota dealer.

    An alternative might be to take a chance on a used part off ebay or junkyard? Like I said...they don't seem to go bad often so maybe it's a good chance a used one will work fine.
     
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    #2
    McGyver9[OP] likes this.

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