Inaccurate analog speedometer - Toyota Yaris Forums

JudgeM · 09-08-2014, 06:19 AM

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?

CTScott · 09-08-2014, 08:10 AM

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.

*Astroman* · 12-23-2014, 05:00 PM

This was posted in the wrong section, moved it. Please remember to post your threads in the correct section.

09-08-2014, 06:19 AM	#1
JudgeM View User's Garage Drives: 2005 Toyota Vitz RS Join Date: Jan 2012 Location: Auckland, New Zealand Posts: 181	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
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	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. __________________

12-23-2014, 05:00 PM	#3
Astroman Modded Moderator View User's Garage Drives: 07 Toyota Yaris, 71 Galaxie Join Date: Mar 2007 Location: Wenatchee, WA Posts: 3,670	This was posted in the wrong section, moved it. Please remember to post your threads in the correct section. __________________ Please visit my online store for computer stuff and Official Yarisworld decals!

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