Quote:
Originally Posted by Pro60modman
Built the boot circuit on tactrix website, use a soldering iron and ECUflash or the Renesas program.
EDIT: The first ECU I tried was from a friend's 2008 STI. Got impatient and used a spare battery and re-purposed Honda wiring pins to power and ground the computer. Worked like a charm.
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Yes brz\86 ecu is different SH 72531 precessor it has two rom areas called MAT,s the one we write to is the user mat, but it also has a boot mat that tactrix and other flash systems dont touch. This is what saves you when flash fails unlike the older wrx 7058\7059 based ecu.
Dont try to sh boot mode the brz\86 ecu as both user and boot mat get deleted when you enter sh boot mode using hardware circuit. unfortunatly opensource has not been able to read boot mat so you cannot write it back.
http://www.ft86club.com/forums/showthread.php?t=95334
only option at present is to swap in replacement ecu
http://www.ft86club.com/forums/showp...91&postcount=1
other option may be to hardware strap the processor to user boot mode which does not erase both rom areas on entry, ecu has 3 modes run mode user boot mode and sh boot mode
mode is controlled by the MDA and MDB pin voltages. fot just boot mode you need to set mdb pin to 5v, it may float high if just unsoldered for its ground connection, then put ecu back in car and flash with tactrix, as user boot mode ecu still uses obd port not serial port so you dont need external circuit for serial port access.
If flash sucessfull then remove ecu again reconbect mdb to ground.
Have not tried as not bricked one yet
also processor chip is surface mount and extremly fine small pins, desoldering just thge one pin will be difficult.