Does anybody know, what address in the ECU, controls the temperature that the cooling fan starts and stops at.

 

I would like to reduce the start temperature of the fan down to a realistic value, rather that the current "bugger - I'm overheating" setting.

In fact does anyone have any addresses that could be useful?

 

I have all of the standard engine tune addresses (well most of them) but I'm sure there would be a lot more info out there somewhere. I'd be happy to construct a spreadsheet or something for everyone to share if people are willing to contribute infomation.

 

It would be a handy resouce for those doing mods in the future.

The main fan activation temp parameters is at address 0x7442 and 0x7443 (both registers have a value of 0x8C)

Lowering the value of these registers will lower the fan activation temperature.

The activation temp with AC on, is the decimal value of these register minus 50 or minus 35 with AC off.

 

example:changing both registers to 0x87 will lower the fan activation with 5 degrees Celcius: fan will be activated at 85 Celcius (with AC on) or 100 Celcius with AC off.

Thanks Lymon

 

Do you have any other secret squirrel registers you would like to share?

see http://forum.ztechz.net for more info on registers and ecu "hacking"

Interesting but im not brave enough to mess about with my eprom. Wonder if this is something andyP and the other guys pushing out chips could add to their eproms. Few extra degrees the right way must be a bonus! Especially in summer

Thanks Lymon

 

Much appreciated

 

Good idea Geeky, a worth while mod me thinks