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How can you recalibrate the electronic speedo

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How can you recalibrate the electronic speedo

Postby jfradley » Thu Aug 07, 2014 9:20 am

I have a new 2014 ls-t D-max , it's just done 3000Km,and the electronic Speedo reads 7Km slow at 100Km/Hr, the Dealer says it's within acceptable limits and will not recalibrate it under warranty. Anyone know how to go about recalibrating the Speedo? I want to keep it as standard and am not interested in putting on larger tyres
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Re: How can you recalibrate the electronic speedo

Postby geeves » Thu Aug 07, 2014 3:23 pm

anything you do will void the warrentee. Bigger tyres though shouldnt be an issue Just going from a 245x70x16 to 245x75x16 will half that error If you go for a nice set of larger diameter mags the tyre choises to fix this become almost endless.
My work hilux is even worse. a gps 100 is 108 Think of that on diesel tax day. Do also think how much it improves your economy (on paper)
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: How can you recalibrate the electronic speedo

Postby isuzurob » Thu Aug 07, 2014 5:47 pm

law is as long as its within 15 percent of the speed indicated on the gauge, if you want to carry on trying to get it closer try anything electronic in nelson they are pretty good or will point you in the right direction
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Re: How can you recalibrate the electronic speedo

Postby jfradley » Fri Aug 08, 2014 1:12 pm

I checked the odometer and speedo using a GPS , the Odometer was spot on over a 20Km run so no Diesel Tax issues but the speedo was another story!
Have approached the dealer, whose initial response was "not a warranty issue as it's within tolerance, but will check with Isuzu NZ."
if I try to fix it myself I will void the warranty, and putting a new $70,000 vehicle in to the dealer to have the speedo re calibrated at my expense is just not right :evil:
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Re: How can you recalibrate the electronic speedo

Postby geeves » Fri Aug 08, 2014 3:02 pm

7% is legal but still a lot
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Re: How can you recalibrate the electronic speedo

Postby muzila » Fri Aug 08, 2014 4:47 pm

Well if 7 - 15 percent is regarded as fine and you get a ticket for speeding even if you travel the correct speed on the speedo, ( remember only a 4 KPH tolerance) are the dealers going to pay the ticket????? Also what about the demerit points???

I know tours is under the correct speed as is my Mu by 11 kph, :) BUT it is an interesting question if the speedo is reading slow!
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Re: How can you recalibrate the electronic speedo

Postby geeves » Fri Aug 08, 2014 6:32 pm

I read recently that for wof purposes a speedo is not allowed to read low but can read up to 10% high. I never got pinged in the old bighorn with about 8% high but did once nearly get caught out when I was at a Scout Jamboree and the other Leaders car blew up. (It was a Hilux) His partner picked up my Bighorn from my place and drove it to Feilding so we caould get all the gear home. She commented on how slow everyone else was driving and she had been cruising all the way from wellington at 110kph with everyone else virtually standing still. 110 was really 119 No tickets arrived in the mail luckily. Guess I would of had to pay them
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Re: How can you recalibrate the electronic speedo

Postby jfradley » Sat Aug 16, 2014 9:16 am

I have found a unit at Jacar that will do the job! http://www.jaycar.co.nz/productResults. ... MIT=Search
so have ordered one , shall let you know how I get on.
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Re: How can you recalibrate the electronic speedo

Postby jfradley » Wed Sep 03, 2014 12:00 pm

No joy with the jaycar unit, it will only correct the earlier type Digital speedo not the the newer cam bus digital system on the D-max,
Have been talking to speedo Tec's around the country and the consensus is that this type of speedo can only be corrected via the computer software or by steping up tire size to compensate for the speedo error. I have been in touch with the Isuzu dealership requesting to have the speedo corrected at my expense, however they told me that they couldn't recalibrate it and there was nobody in town who could!
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Re: How can you recalibrate the electronic speedo

Postby samk115 » Fri Sep 05, 2014 3:42 pm

Some insider information:

Speedos are set from factory to read a certain percentage high on most modern vehicles, this is so that customers cannot blame the manufacturer for any speeding tickets they may get by saying the speedo reads wrong. I work for a ford dealership and we get customers complaining about this all the time, basically since GPS became a fairly common thing to have in a vehicle, but there is nothing we can do about it to correct it and keep a new vehicle warranty active.

I can also view the car configuration files via our diagnostic tool to check the % that the speedo should be out by and then conduct a road test to confirm this, 99.99999% oof the time its correct, i did have ONE car however that read low (i.e was doing 107ish when indicating 100 on needle AND digital speedo) instead of high and it was corrected by replacing the cluster.
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Re: How can you recalibrate the electronic speedo

Postby geeves » Fri Sep 05, 2014 7:22 pm

i did have ONE car however that read low (i.e was doing 107ish when indicating 100 on needle AND digital speedo) instead of high and it was corrected by replacing the cluster.

Did it read high afterwards ie 107 when doing 100

I know there are heaps of variables but if the creators just said "our speedos are 99% as long as you have x brand and model tyre, brand new, inflated to y psi and if you change these parameters its your problem to make an allowance" To say our speedo is guaranteed to be out by z% seems nuts
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Re: How can you recalibrate the electronic speedo

Postby samk115 » Fri Sep 05, 2014 9:48 pm

I think i may have been a bit ambiguous.

The data FROM the speed sensor is adjusted by the set factor in the car configuration file, so if the wheel speed sensor is reading 100kmh it would display the adjusted value, so lets use 7% as an example it would say 107kmh. In no situation would we ever say that the speed is this EXACT percentage out, we would check the figure and determine whether or not it is within ford motor companys acceptable range for a given vehicle.

Of course if you adjust the tyre size, or even if the tyre has less tread than factory, the speed read at the speed sensor will be innacurate, however minor or major it may be. This assumed "speed" will still be adjusted by the given value.

The only way you could allow for people changing tyre sizes would be to allow us to change the calibrated rolling circumfrence of the tyre so that we could work it out and put it into the computer, however they dont let us do that.

Its all an arse covering technique to stop law-suits basically.
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Re: How can you recalibrate the electronic speedo

Postby jfradley » Fri Sep 19, 2014 7:11 pm

I got pissed off and sent an e-mail to Isuzu nz about this problem,and was very surprised when the General Manager ( Murray Greenhalgh ) of Isuzu NZ rang me to talk about the problem!
He has agreed to send a new D-max to a instrument repair specialist to see what is involved in recalibrating the speedo , and will get back to me in a couple of weeks hopefully with a solution to the problem. :D
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Re: How can you recalibrate the electronic speedo

Postby jfradley » Tue Dec 16, 2014 10:53 am

Isuzu NZ have been in touch and have agreed to recalibrate the speedo at no cost! am impressed with Isuzu's after sale service :D :D
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Re: How can you recalibrate the electronic speedo

Postby jfradley » Sat Jan 24, 2015 7:58 am

All done and working Great! :D
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Re: How can you recalibrate the electronic speedo

Postby HarryVL » Wed Feb 04, 2015 4:28 pm

I recently had an issue with my 98 Wizard fuel gauge not working [needle fell off].While replacing the gauge I took the speedo needle off and after I put it all back together speedo was reading 25 kph fast.I took the clear cover off the instrument cluster and drove it like that while I got the speedo right by trial and error.Had to take the needle off and move it about 20 kph below the stop.It's still about 2 kph fast but I can live with that.Regards,Harry.
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Re: How can you recalibrate the electronic speedo

Postby tonyred » Wed Aug 15, 2018 10:06 am

jfradley wrote:Isuzu NZ have been in touch and have agreed to recalibrate the speedo at no cost! am impressed with Isuzu's after sale service :D :D

jfradley can you tell me what they did to it pls. Thank you
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