vx pcm
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hkcoupe
- Posts: 2
- Joined: Thu Aug 06, 2015 3:38 pm
vx pcm
just wondering if theres a way to reset my vx flash pcm after a bad speed setting change I tried which now makes ose flash tool tell me the cars moving so I cant flash the old bin back in
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Holden202T
- Posts: 10435
- Joined: Sat Feb 28, 2009 11:05 am
- Location: Tenambit, NSW
Re: vx pcm
have you tried removing the battery power ?
No matter what the question is, the answer is always more horsepower! 
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
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hkcoupe
- Posts: 2
- Joined: Thu Aug 06, 2015 3:38 pm
Re: vx pcm
yep tried removing power and even made a bench testing setup so nothings connected besides whats needed to log and flash , it tells me in tuner pro that its doing 206kph road speed without it even running
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VL400
- Posts: 4991
- Joined: Sun Mar 01, 2009 4:54 am
- cars: VL Calais and Toyota Landcruiser. Plus some toys :)
- Location: Perth, WA
Re: vx pcm
Its not something the flashtool can overcome, only suggestion maybe be a pulse generator on the speed sensor input and try and break the code by overflowing something so TunerPro reads 0 kph.
And the reason why its a problem. The flashing process uses the PCMs RAM to upload code from the PC and then run it, this code does the actual flashing. But to upload code to RAM the PCM needs to be in ALDL mode 5, which the flashtool requests. The PCM code does a check that RPM and KPH are both 0, if they are not the mode 5 request is rejected and that is as far as you can get.
And the reason why its a problem. The flashing process uses the PCMs RAM to upload code from the PC and then run it, this code does the actual flashing. But to upload code to RAM the PCM needs to be in ALDL mode 5, which the flashtool requests. The PCM code does a check that RPM and KPH are both 0, if they are not the mode 5 request is rejected and that is as far as you can get.