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Fuel Gauge Calibration Instructions

Discussion in 'Gen II Prius Care, Maintenance and Troubleshooting' started by efusco, Feb 2, 2006.

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  1. efusco

    efusco Troll Slayer Staff Member

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    I thought I had a copy of these on my computer but can't find them and a quick search didn't turn them up here either. Was one of my plans today now I can't get it done. :(
  2. galaxee

    galaxee mostly benevolent

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    from rick57 over on the old site:

    Ok everybody,sorry this has taken to long. Been busy with a lot of things going on and I forgot, Embarassed . I had a new 2G Prius in for PDI and decided to give it a try. And guess what,I found out what we were doing wrong! Just one little step messes up everything. Here is the steps from the TSB and only applies to the 2G.

    1. Park the vehicle so as it is level,front to back and side to side.
    2. IgOn and make sure that "Trip A " is showing on the odo ( this is where we made a mistake Embarassed ).
    3. Power down.
    4. Keep your foot off the brake.
    5. Push in and hold down the Odo/Trip button.
    6. Push the Power button twice to IgOn ( not Ready mode ).
    7. Turn the Odo/Trip off then On 3 times in 5 seconds.
    8. Continue holding the Odo/Trip button until a 6 digit code appears.
    9. Release,then push again the Odo/Trip button for another 5 seconds. The 6 digit code will change to a 5 digit code.
    10. After the middle digit,of the 5 digit code,changes to "1" release the Odo/Trip button and the odometer will return to normal reading.

    Hope this clarifies the steps.

    _________________
    Rick Angles
    Toyota Master Diagnostic Technician
    Toyota Hybrid Technician
    Germain Toyota
    Columbus, Ohio
    mich.g.pan and Suspenderman like this.
  3. joelparks

    joelparks New Member

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    ...and why would one need to do this?
  4. galaxee

    galaxee mostly benevolent

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    if your gas gauge reads really wacky (read: even more wacky than normal.)

    the inclinometer is used to set a baseline for how level the car is to interpret the reading of the gauge in the tank into the bars you see on the display.

    for example, if you continually run out of gas with 3 bars left, you need this reset. it's not something the average driver should do on a routine basis. they do it at the dealer- this site just happens to have some techs with access to this info...
  5. rohlrogge

    rohlrogge Rich

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    Just out of curiosity would this also make any sort of correction to the opposite condition where I get the blinking single bar and I still have 3 gallons of gas remaining in the tank? According to my dealer he indicates that this is normal!!
  6. efusco

    efusco Troll Slayer Staff Member

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    It will only make a correction if it's out of calibration, not if that's how the car is programmed.

    This car's fuel guage is just plain odd. I've been monitoring my dash fuel guage simultaneously with the fuel tank % on the CAN-View.

    After fill up (and probably topped off way too much but no blow-back) showed 97% and all 10 bars.

    First bar dropped off at ~90%

    Second bar hasn't yet dropped and I'm at 67%

    I figured I'd try a recalibration...it can't make my fueling issues any worse. <_<
  7. galaxee

    galaxee mostly benevolent

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    that IS normal.

    if you're not sure, don't do it. it's not meant for the driver to do anyway.
  8. galaxee

    galaxee mostly benevolent

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    did you park the car on an incline when you fueled up? that's what usually does it.

    i'd maybe watch it and see how it behaves over the next couple of days- then recalibrate. since you know how much gas you have in there, running the tank dry isn't an issue. how many tanks have you observed on the CanView?

    of course that's MHO and not a direct order :lol:
  9. efusco

    efusco Troll Slayer Staff Member

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    I've been toying with the idea of doing a recal for a while...I always need to try something new to spice up my prius life!

    I didn't mean to imply that this tank has behaved any different than, say, the last 50-60 tanks, just that it's always weird. I've never, in 37k+ miles of driving, gotten more than 9.3 gallons in the tank...not once and despite driving 50+ miles after the last bar started flashing and having the old fuel tank TSB done and all.

    I figure, what harm can I do by trying a recalibration. I'm going to wait until I have a day off (next week) so I can have time to redo it if I mess up, but I'm going to do it just to say I did it and to see if there's any positive change in the fuel guage readings.

    I think this is my 3rd tank since getting CAN-View, but I didn't watch the fuel tank & much on the second, at all on the first, but have watched it continuously on this tank.
  10. galaxee

    galaxee mostly benevolent

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    ahh, so you're one of THOSE. ;) at least you know the car and you have a pretty good grasp on how it works.



    i got in 10... once... after running it so near empty i scared myself. otherwise i'm in the same boat, minus the TSB.



    well, a recal can't hurt if you're on a level surface. it would be interesting to compare CanView vs fuel gauge before and after recal- in case the cal was off some at first. well let us know how it goes then. :)
  11. efusco

    efusco Troll Slayer Staff Member

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    Ok, couldn't wait, tried to do this about 6 different times and it's just not working.

    I do the hold down the ODO button thing on going into IG ON mode, wait a second or two, then do the off-on 3 times and......nothing. sometimes the ODO goes to ODO B, or ODO, or even back to ODO A, but I hold and hold and nothing changes...I never see the 6 digits.

    Anybody out there done this successfully that can tell me what I might be doing wrong.

    BTW, I watched the CAN-View...started at 60% on start up and was down to 57% by the time I pulled out of my driveway (it isn't that long). Fuel guage showed 7 bars.

    Tank % stayed at 57% the entire 13 mile drive to work, but the fuel guage dropped to 6 bars just as I arrived.

    so much for any clear correlation there!
  12. rohlrogge

    rohlrogge Rich

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    Evan, I finally got around to trying it today and also had no luck. I guess I'll just continue to live dangerously in the 'single blinking bar' world and guess by mileage until one day I guess a little on the wrong side and run out of it!!
  13. IsrAmeriPrius

    IsrAmeriPrius Progressive Member

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    I performed this procedure on my '05 a couple of weeks ago. It took a few tries, but ultimately I succeeded. The gauge is back to the approximate same degree of accuracy that I used to experience before the car spend a few weeks in the body shop where both batteries were removed prior to the car being placed in the heated paint spray booth.

    I will repost Rick's instructions and bold the steps which may be be the key to a successful recalibration:



  14. ScubaX

    ScubaX Member

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    I don't recommed that at all. I also thought I had plenty of gas at the blinking bar because the most I got in during that blinking bar was 10 gallons. Well, after I ran out of gas I still only got 10.6 gallons in. The bladder staying compressed causes the problem. So minus the space taken by the bladder defect your really only have ~10 gallons. Once I fuled with a broken nozzle that I had to shut off after fuel spilled out onto the ground. From the blinking bar I got 11.67 gallons. I was so happy. Now I am back to 9 to 9.5 gallons at the blinking bar. I MIGHT have only .5 to 1 gallon left. That is just a guess. Your guess may vary.
  15. richard schumacher

    richard schumacher shortbus driver

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    It *is* normal, because you don't have three gallons remaining. You have less than one gallon. The tank almost never really holds the nominal amount of 11.9 gallons. If you ignore the flashing bar you will one day run out of gas. Don't say we didn't warn you :)
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  16. rdenneyutmb

    rdenneyutmb New Member

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    Still learning my new Prius, so I have a gasoline tank-related question. Has anyone run out of gasoline before the last pip starts blinking? So far in three tanks I have filled up a few miles after seeing 2 pips, and have put in 8.1, 8.6 and 8.8 gallons. Looks like going down to one is reasonably safe?

    Thanks
  17. tripp

    tripp Which it's a 'ybrid, ain't it?

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    Yeah, I'd say yer good there. I just filled up yesterday and put in 9.847 gal. That's the most I've ever put in. I went 442 mi on that tank. The MFD calculated 51 MPG and the manual calc came in just under 45 MPG. The temps have been all over the place and the last time I put gas in it was a lot colder. I don't really trust the fuel gauge at all but I think that on my car it's understating what's left in the tank. That, or my MFD calcs are way optimistic. Considering how variable the temps are here in CO I don't put much faith in the manual calculations. It seems impossible to get a consistent fillup between the bladder, the vapor stuff on the fuel tank, and the particular gas pump you're using. So I've mainly been tracking my fuel efficiency with the MFD. Does anyone know how accurate it is?
  18. AlphaTeam

    AlphaTeam New Member

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    Ya, I'd like to know too.
    On Greenhybrid.com it says I have 38.5, but I was closer to 40 on my lifetime accoring to the computer.
  19. chezypuffs

    chezypuffs New Member

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    What is 'Can-View'??
  20. efusco

    efusco Troll Slayer Staff Member

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    <div class='quotetop'>QUOTE(chezypuffs @ Mar 29 2006, 01:46 PM) [snapback]231787[/snapback]</div>

    see http://www.hybridinterfaces.ca
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