Cruise Control will not set above 115Ks and Speedo Calibration

[Thombee Lurker Find all posts View Profile Close Thombee]

Hi

Has anyone else had this issue; my Cruise Control has a maximum speed of 115K. I thought it could be a cable, but when going up hills, it changes down and accelerates the engine to maintain that speed. if so how did you fix it

the problem would not be that bad but the speedo is out by 10 Km (at 115 on the speedo, I am doing 105 across the ground) has anyone had the speedo re-calibrated, is it a big job?

the tyres are 255 65 17 as opposed to 265 65 17, but that is only going to be 2 kmh.

thanks

Thom

[scottkz Senior Member Find all posts View Profile Close scottkz]

This is in the 120 section... i thought all 120s were fly-by wire but being in NZ maybe not. Anyways it sounds like the cruise ecu is receiving a incorrect signal, auto or manual? Cable throttle or fly-by? Engine?
But also if its a jap import you may have a limiter on it most jap cars back in the 80s had 100klm chimes that dinged over 100

[RanJ Avid PP Poster! Find all posts View Profile Close RanJ]

That's a long way to be out by! You might be the poor soul that has your tolerance right at the edge of acceptable and your tyre difference puts you out just that little bit further! Bugger.

I believe that a techstream is required to adjust your calibration. Alternatively, jaycar sell a kit that can modify your signal as well.

Where you put it in the chain will determine what is affected. It can be wired so only the cruise control sees the difference and not the dash or the ecu. Vice versa, whack it on the output of the abs module and everything will be adjusted. But modify the inpit to the ecu may (I really don't know) have other consequences.