Good point Ken, static can be a very bad thing on electronic components. Not
to worry though the ECU board is conformal coated and I would not disturb
this factory coating unless I absolutely had to. My measurements were done
on the TPS wires not the ECU.
The main difference in 93 vs. 94 ECUs was thoroughly explained by RSR so I
will not elaborate but I bet you one could mix and match components with
little if any performance difference. I think the only difference is in the
EPROM mapping, period.
Bottom line is motorcycle EFI, especially in year 1993 was still a black
art, not well refined so "hear we seat in a pile of shit".
George trying to eliminate the need for dippers
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: Multiple recipients of list <[EMAIL PROTECTED]>
Sent: Saturday, September 02, 2000 6:56 AM
Subject: Re: Medic !!!! ( IC numbers)
>
> BE CAREFUL!
> For what ever you do make sure you are static grounded. That is you
> should have a wire to ground you to the bike and anything else. You can
> burn out such devices and not even know it. I work for a radio system
> company and we must wear static dispersant shoes, clothing and wrist
> straps to ground us when handling IC's and other electronic components.
> As for the numbers of course they are two different IC's. They have
> different circuits and software made and programed into them. You will
have
> too most likely contact the manufacturer for details. Or someone within
> Yamaha that works on the software to make any progress on what is going
on.
> The voltage readings that you are getting maybe the difference in the
> fact
> that 94 year circuit sensors have had some component changes. That is
they
> have been reprogramed or calibrated to match the newer needs of the IC.
> Therefore it maybe why different year ECU don't work well with other
years.
> You have to calibrate them or set them other than the 1'o clock setting.
> There maybe some devices that have been changed to match the 94
> ECU that we are not aware of. Oxygen sensor etc. If you can track
> down all the devices that are connected with the 94 and check them with
> the 93, if they are different numbers then those devices have different
> voltages probably signaling the ECU. That's maybe why you have
> different MPG readings and such. There's a difference somewhere with
> the 93 vrs 94 other than the ECU which effects operation and tuning.
> Worst case is that other fixed parts within the ECU, TPS or somewhere
> and you have to match them up for use with the 94 model year prom.
> Anybody changing over will have to buy a bunch of modules or sensors.
> Ideas from experience with electronic devices at work. Changing the
> software prom sometimes we then have to reprogram and tune units
> differently than the before. Or find that resistors, caps, diodes and
> such have to be changed in circuits somewhere else.
>
>
> Ken Swartz
>
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