Quote:
Originally Posted by steve99
We don't have tyre pressure monitoring or sensors, ROM was pulled from another australian BRZ but 2015 model
I believe the display cluster is driven from the Body Control unit.
Everything on my car worked ie display/dash no traction/VSC lights just the U0155 code/CEL and limp home mode evident by unable to rev beyond about 4000 rpm.
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From 2015 on tyre pressure warnings are mandatory all over EU => Toyota had to upgrade their wiring loom => the ECU had to be adapted and the routines for tyre pressure warning had to be implemented => for countries where no tyre pressure warning is delivered this feature will be coded out using the tables in ROM (where you set any default equipment codes, might be in Body Control Unit).
My assumption: Due to the fact that Toyota won't make a wiring loom for every different need they produce one "universal wiring loom" with minimum effort/costs. So I believe all wires and code for this feature are in your (Australian 2015) wiring loom/ ROM too and we just don't know how to disable that sensor-less feature...
Viewed from other side: No tyre pressure sensors => no signal to process => this fault is permanent, so you can't delete => because it's a safety feature speed and revs are limited to make sure the driver recognizes something is wrong => limp mode. Flashing back to A01G the ECU, wires and sensors match again => no further problem => no limp mode.
How to solve: Hopefully someone will come around with an EU 2015 D00G ROM. Compare D00G with and D00G without tyre pressure warning side by side you will find the differences and probably you'll be able to work out a solution (where to set/reset the tyre pressure flag, if this is set in the ECU of course). Well, it's a slave work to do so, but it might be an attempt... Having some new documentation might be a big help too.
Sorry to bother you with an old, but instrucive story: Had a car some years ago which failed to start (no starter motor). Mechanically all was sound. After a long investigation with a couple of people and numerous laptops someone came around and suggested to check equipment codes. He was right! The car was AT but the codes said MT. Nobody was able to press the non existent clutch for getting the "clearance" to start the engine! After correcting the codes the "ghost was gone".
My two cents and bye for now Fred