Winding Back a Digital Odometer

[BZG Wagon]

I've been looking at "new" (used) cars & notice some have insanely low kays for the age / condition of the car.

Just how hard is it to reprogram a digital odometer on a 2000-ish Toyota?

Laptop & ODB-II connection easy or do they have to remove the odometer & chip? Unless it were the later I don't see how an "AA Certified" odometer reading would certify anything.

To be honest; really, really low kays put me off just as much as high kays.

[B_giB]

Been driving with speedo D/C'd?

[matt dunn]

Just how hard is it to reprogram a digital odometer on a 2000-ish Toyota?

It is almost impossible,

to the point where when we fit s/h speedo's to cars,
you have to buy one with lower mileage and then get it run forward,
as we have not found anyone in NZ yet that can alter them.

So if you know someone who does it let us know!!.

Not even the dealer scan tool can do it.

[NZ_AE86]

Many can be run forwards and 'loop' back to zero but some stop at 999,999 and your $&#$%!

But all they need to do is get a low kms dash from the same model at a wrecker and chuck it in - you'd never know.

[Lloyd]

Rolling them back over is a bit time consuming as all you're really doing is sending a speed sensor pulse to the dash to say the vehicle is doing 200km/h so really the most you can put on the dash is another 200km per hour. So to click back over the million will take you about 7 months sitting on a pulse generator

Buying one with less is a bit easier

[frost]

and what about if its linked to the security system. like those new cars that match key, dash and computer together or the engine wont run,

[Lloyd]

Dealers program those easy enough

[BZG Wagon]

I thought the odometer reading was stored somewhere in the proximity of the ECU... making a dash cluster replacement irrelevant?

But it sounds like from these posts low kays means low kays, so I shouldn't stress about it.

[Lloyd]

Haven't struck one yet thats been ECU defined, though Matt may have

[Nuty|Mike]

ive heard that people have been swapping low kays speedos out of crashed cars into the imports before they get here could be a reason?

[Alex B]

Dealers program those easy enough

Old ladys RAV4 has a warning in teh book if you loose both keys you're up for a new computer.

[Lloyd]

Yeah, lose one and you're fine and the program it off the other one. Lots of manufacturers are like that and you don't need to go to a dealer for all of them to program either.

Lose both keys on most modern security coded ones and its starts costing thousands

[Emperor]

To be honest; really, really low kays put me off just as much as high kays.

Hardly.. You never know the circumstance the vehicle was in when in Japan etc.

Dad imported a V35 Skyline with 500kms(yes, 500 not 500,000). Cause it had been a showroom car.

[Bling]

Hardly.. You never know the circumstance the vehicle was in when in Japan etc.

All the more reason to question the winding back of speedo's

[matt dunn]

Haven't struck one yet thats been ECU defined, though Matt may have

No, all speedo reading I have seen are stored in the speedo.

All the rest is immobiliser based which has nothing to do with the speedo,
just coding all the units to talk to each other.

Audi's are the only cars I have struck where the immobilser brain is part of the dash, usually everything else it is in the Engine ECU or BCM.

[Lloyd]

And those Audi outs are scary how expensive they are. Have done a few TT dash units that the fuel gauge or the centre display starts to die. Used to be about a 2k exchange + labour + dealer coding from memory

[jaypines]

almost all digital toyota speedos have a serial data chip in them.. usually a 93cXX. all you have to do is find the bytes which indicate milage and change them to whatever mileage you want. may not be the exact mileage but it will be very close.
the hardest part is removing the chip from the board as sometimes you also need to remove the servo/needle and other components (dont want to mess with the needle calibration)

[rollaholic]

i remember seeing one of those 20/20 close up type programs a few years ago with a guy that had a late model BMW dash plugged into his laptop, and was changing the mileage to whatever the interviewer requested

yet another reminder than kms is not really the best indication of condition, as even really low km engines might have spent many hours idling through tokyo traffic or something

need 2 stroke mx bike style odos that have the number of hours run as well as the kms

[79rolla]

my mums 98 pulsar has 45000 on the clock, and judging by its condition its origonail ks. all tho it has had a crash at some stage so possibily spent time being repeard/resold.

best way to check is to test drive it to a mechanics and put it up on a hoist to check over everything

[sergei]

I have seen genuine under 50000kms cars with completely sludged motors.
I have also seen exactly same models as those sludged with triple of kms and completely clean engine.