Electrical shorts, 12 V battery, evaporative emission control system vent circuit, ecu communication

Discussion in 'Newbie Forum' started by Hfabiani0127, Sep 12, 2018.

  1. Hfabiani0127

    Hfabiani0127 New Member

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    2004 Prius
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    Hi. I have been having all sorts of issues with my 2004 toyota Prius with 200000 miles, and I would like to know what I should get fixed. I don't want to take it to the dealer for the actual repairs/maintenance, although I took it in and paid for a diagnostic. For a couple of years, the display lights for gas and speed have been occasionally working. Some days they work, others they don't display my gas, mileage, speed, ect. However, my check engine sign remains on. At first, they would work about 3/4 the amount of time, now they only work approximately 1/4 of the time. Also, now the tape player and cd player is recognized 3/4 the time. The information screen would stay on when the car is powered off and the car no longer recognizes when the key is inside of the car. The head and tail lights randomly don't work. The horn has completely stopped blowing. I believe the display and airbag remaining on ultimately killed the battery. Also, the airbag signal stays blinking when the car is off. I knew I was in for some major issues when the car wouldn't accelerate on the highway, and completely died while I was driving. I replaced the 12 volt battery, which stopped the random display system from coming on in a powered off car. The airbag on the dash remains to flash with the power off. Also, I am having problems at some gas stations with the pump thinking my gas is full. It pumps fine when I turn the nozzle upside down. I don't want these issues to completely kill the car. I have previously taken the car to the dealer twice with these electrical issues, once for the headlights. They told me to replace the headlights. I did. It never fixed what is causing it to occasionally break. The engine also doesn't sound the best and my check engine light is on, after an oil change. The same thing happened before and I replaced some other part that didn't fix the original issue when this originally started. At first it was hard to get a diagnostic as these issues would only randomly happen, but now the issues are happening most of the time, so my current diagnostic codes came back as powertrain P0446. Electrical B2775, B1271,B1801, B1811. When I ran the diagnostic, it said my evaporative emission control needed to be replaced. When I did a self-check there were memory codes 58-43, 63-44, 63-51. I'd like to buy the parts I need and pay someone for the labor I cannot do myself. I don't want to pay someone for unnecessary work or part tax when I can get it myself, as Im pretty broke and cant get a new car any time soon.
     
  2. PriusCamper

    PriusCamper Senior Member

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    Not Sure which Lakewood you live in? If It's Lakewood, WA. you only live 20 minutes from me and I might be able to help...
     
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  3. ChapmanF

    ChapmanF Senior Member

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    That's probably a really good offer to consider. My first reaction reading the first post is that after two years of neglecting problems and letting them pile up on each other, it is going to be a giant spaghetti-plate of issues to untangle, maybe economically unsupportable unless it is a labor of love for you and the time to spend on it is free.

    Disclosure: I learned a lot from a first car that was pretty much like that. I started tearing into it when I was 15, so there was a good year and some change to spend on it before I had any need of driving it anyway. :)

    -Chap
     
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  4. kenmce

    kenmce High Voltage Member

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    Before you pick up a wrench, you need to track down the exact meaning of those trouble codes, and see if there are any major issues that you can't possibly deal with. It would suck to put $ 500.00 worth of parts and two months worth of weekends into it, and then find out that you still need a (shakes dice) new traction battery or something.

    You also need to assess your ability to work on the various issues.Some of these look a little advanced for a rookie. Have you ever pulled a dash? Do you own tools? Do you have an inside place to work? Are there any junkyards around where you live? Do they have any Priuses in the yard? Do you have the patience to go out day after day even when it's [email protected]#$%%^!!!! frustrating, even when you come away with cuts and bruises sometimes?

    I would like to suggest that you need to set up an order of operations, that is decide in what order you will approach the many issues. One you might consider is this:

    1.) Items that affect the safety of the vehicle (Tail lights, headlights, horn)
    2.) Items that will stop you from passing safety inspections (Engine light, false airbag symbol)
    2.) Items that may get you in trouble despite your best efforts (Speedometer, gas gauge)
    4.) Things that are just annoying (Radio, CD player, key sensor)

    Another way to organize this is to ask yourself, "what is the biggest problem I can afford to fix right now?"

    You can allow yourself to veer off schedule when you have multiple issues in the same area, for example when the dash is out you'll want to fix *everything* in there while you have it open, even if some of the items are low priority.

    Toyota has some kind of online manual that you can rent access to - someone here will know the name and address - I think it's $15/day and you will want to download the entire thing. If there is a Haines or Chilton manual for '04 Prius you will want that too.

    Finally, the car is getting into the last quarter of its life. It could up and die even if everything you do comes out perfect. Can you just accept and work with this?

    PS, you have trouble putting in gas, and there is a problem with the gas evaporation equipment. Maybe related?
     
  5. Hfabiani0127

    Hfabiani0127 New Member

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    ----USA----
    I live in Lakewood Ohio. Darn it. Thank you so much for the offer.
     
    #5 Hfabiani0127, Sep 18, 2018
    Last edited by a moderator: Sep 18, 2018
  6. Hfabiani0127

    Hfabiani0127 New Member

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    Location:
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    Vehicle:
    2004 Prius
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    ----USA----
    Hi. I have watched youtube videos on how to take the car apart. I do have the tools for the display. Garage, check. I rigged my car to pass emissions test and got it in on the line before the computer signaled the code. I agree with the order of operations, and the largest problem is the unfortunately te emissions control system, as I do believe it is what killed my battery, and will ultimately kill the hybrid. I agree they must be related. That short with the horn, I watched someone take apart, and it is located right next to the airbag. So, I can do it at the same time. I was wondering if the headlights and tail lights are all connected to the drivers side somewhere, as I have a short in the drivers side. Also, I was wondering if there could have been a leak causing all this? I have fixed the lights before, but I believe the short causes them to randomly work.

    It sucks when you cant find a good mechanic. There are only 3 dealerships around here. Two fixed the "problem", but the same issues keep happening after replacing the head lights. It has to be in the wiring somewhere, and no one wants to test all the shorts for under a g.
     
    #6 Hfabiani0127, Sep 18, 2018
    Last edited by a moderator: Sep 18, 2018
  7. Skibob

    Skibob Senior Member

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    What you need is a copy of Techstream, a mini VCI and a laptop to start. That would help to determine if the problems are ECU related. The speed display is a known problem, it will have to be rebuilt. Everything else?
     
  8. Hfabiani0127

    Hfabiani0127 New Member

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    Location:
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    Vehicle:
    2004 Prius
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    ----USA----
    Rebuilt or should i just buy a new combination meter? what about the fact it sometimes works?
     
  9. Prodigyplace

    Prodigyplace Senior Member

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    You best options are from a PriusChat member here.
    Prius Speedometer Replacement
     
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