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09-08-2014, 06:19 AM | #1 |
Drives: 2005 Toyota Vitz RS Join Date: Jan 2012
Location: Auckland, New Zealand
Posts: 181
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Inaccurate analog speedometer
Hi all.
I think many of you know that the speedometer readings in some Yaris are not accurate. I suspected this and confirmed with GPS. I found that a speedo reading of 100kmh had actual speed of 90kmh. I was playing around with Techstream and I ran the instrument cluster diagnostic. I found that the speedometer was infact inaccurate and even the tachometer !. Please see these videos I made. In the second video I test the digital meter which IS accurate. Techstream speedometer test on analog meter: https://www.youtube.com/watch?v=5LLENLt-is4 Techstream speedometer test on digital meter: https://www.youtube.com/watch?v=yFrP4yERDzY I think its quite interesting. Anyone else tried this out ? Is there anyway to 'calibrate' the speedometer? |
09-08-2014, 08:10 AM | #2 |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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The only way I have found to calibrate them is to digitally modify the signal between the transmission and the cluster. I have only had to calibrate due to tire size differences (and only correctly 2-3 MPH at 60 MPH).
I have never seen one that far off though. I would almost suspect that the stepper motors that drives the needles are damaged from someone removing and re-installing the needle with too much force.
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12-23-2014, 05:00 PM | #3 |
Modded Moderator
Drives: 07 Toyota Yaris, 71 Galaxie Join Date: Mar 2007
Location: Wenatchee, WA
Posts: 3,670
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This was posted in the wrong section, moved it. Please remember to post your threads in the correct section.
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speedometer |
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