Quote:
Originally Posted by Bodalenko
Steve,
The Aussie GTS has LED DRL that come on automatically when the ignition is in the 'On' position.
These don't cause an issue with regard to current spikes and power flow?
The HP fuel pump spins up as well. That is not an issue?
I have the 2013 86 GTS which you say can have dodgy OBD connector pins that can have a intermittent connection problem.
Does the OFT simply not work or can it identify a non connection or poor connection with a falure message before writing has started?
Can this connection issue happen mid update, say when a the OFT. Cable is moved?
Great post from yourself as usual but you've put the fear of God into me.
I'm going to write a pre-flight, or pre-flash, checklist for my car and tick all the things you've mentioned off before flashing or even pluging my OFT in!!!
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True about DRL and fuel pump, although I think my DRL on brz only come on when handbrake is taken off.
The main thing your trying to avoid is a big change in voltage to the ecu. ie a big change in load on battery causing a voltage transient.
Im probably being over cautious as a good battery would need quite a large load to cause a voltage transient large enough to cause a problem.
If the connection is totally bad no flash system will even start to write as they need to send commands to ecu to set up the read or write process, and in the case of OFT its using vehicle power as well to power itself.
What you dont want is an intermittent connection as the data is written in blocks with acknowledgements sent, and failed data connection will result in a failed read/write. Most of these can be recovered by erasing and rewriting, however that can create a drama with flash systems like ecutek that stores the licience info in ecu , as if it wants to re-check licience then its going to fail and refuse to write. Then you need to contact tuner/ecutek for licience renewal as a minimum.
most systems if the flash fails your better trying to re-write the ecu, without turning the ignition off as the ecu will still be in program mode.
The best way to check for intermittent connection is logging and wiggle the cables/connectors to see if it stops logging, this way it does not cause any big dramas if you actually find an intermittent connection