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Speedometer inaccurate (not just the usual complaint!)

Discussion in '2nd Gen. Tacomas (2005-2015)' started by SCFirefighter, May 1, 2010.

  1. May 1, 2010 at 8:25 PM
    #21
    Kyouto42

    Kyouto42 Iron Beard

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    If it's constantly off you could probably tear the unit apart and physically move the needle position... Never done it though so I'm just speculating.
     
  2. May 2, 2010 at 6:04 AM
    #22
    Cape Codder

    Cape Codder Native Son

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    ScanGaugeII = 60 MPH
    Garmin 885T = 60 MPH
    Tacoma Speedo = 62 MPH
    Mile Markers = 120 Sec / 2 Miles
     
  3. May 2, 2010 at 6:12 AM
    #23
    Chad

    Chad Well-Known Member

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    I set my cruise control on 35 (because that was the speed) when I saw one of those police radar gun things that tell you your speed. I believe I was going 33 when I had it set on 35. Same thing with my GPS when I set it up.
     
  4. May 2, 2010 at 6:12 AM
    #24
    Brunes

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    Because your speedo NEEDLE is off- but the speedo signal is just fine. That is why the SGII speed read out (from the trucks ECU) is dead on with the GPS. The error comes from the digital (ecu signal) to analog (needle) conversion. The odo is still getting the digital signal and is therefore a-okay.

    I'm not sure...I don't have a scangauge so I don't know much about them.
     
  5. May 2, 2010 at 7:01 AM
    #25
    NAYo2002

    NAYo2002 Well-Known Member

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    I've had the same issue in 4 rental cars with not matching GPS speed. They are: Chevy Colbolt, Pontiac G5, Dodge Caliber, and Toyota Corolla. I thought it was due to how my GPS doesnt have altitude in it's programing; GPS calculating speed thinking I'm at sea level while I'm actually driving a lot higher so covering more distance than GPS is thinking. For example, if I drove 60 miles in 1 hour, at sealevel I only drove approx 58 miles... Just a guess though, I could be wrong.

    P.S. I don't know how scanguage works so I can't answer that one.
     
  6. May 2, 2010 at 7:06 AM
    #26
    Brunes

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    GPS uses timing signals- They are all relative to each other. So I don't think that altitude will create a speed discrepancy...but I'm not positive.
     
  7. May 2, 2010 at 7:07 AM
    #27
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    You are correct. Altitude on a GPS doesnt affect it.
     

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