[Supras] ECU year interchangability

[sprigmo1]

I think Reg Riemer would be your best bet to answer
that question!  I hoe to have him tune my ecu some
time after X_mas when my wallet is ready!
Malik
--- "berniek at technicaldevelop.com"
<berniek at technicaldevelop.com> wrote:

> Hi list.
> 
> Anyone on the list into electronics, who has gotten
> inside turbo engine 
> ECUs?  I opened up a couple of spares to try to
> determine 
> interchangeability factors.  Certainly there must be
> small software 
> differences regarding fuel and ignition mapping, but
> the hardware 
> appears to be slightly different between '89 and
> 90-up years.
> 
> I have both an '89  and a 91 5 speed ECU as spares. 
> The main and 
> processor boards are the same, but board stuffing of
> two diodes and one 
> 100 ohm resistor differ between the two.  Specifics
> are as follows:
> 
> 1:  100 ohm resistor inputting "ECT" (from ECT
> computer) is not stuffed 
> in the '89, so no signal from the transmission ECU
> is used in the engine 
> ECU.  It is stuffed in the '91.  Seems strange that
> the resistor would 
> be stuffed in any event since the ECU is intended
> for a 5 speed transmission
> 
> 2:  A 1N4001-like diode is stuffed in the '89 with
> the cathode connected 
> to the "LP" pin, which is connected to the headlight
> relay.  It is not 
> stuffed in the '91.  Presumably it is to increase
> idle speed slightly 
> when the headlights are on, but the '91 omits it. 
> 
> 3.  The same type of diode is used in the '89 for
> "DFG", a connection to 
> the defogger relay.  It is not stuffed in the '91. 
> Reason for inclusion 
> in the '89 would again appear to increase idle speed
> when the defogger 
> is used.
> 
> The '91 I bought last month is not running at the
> moment, but I did 
> start up the '90 with a BHG for a few minutes.  Sure
> enough, the idle 
> speed drops when the lights or particularly the
> defogger is turned on.  
> Has anyone got any ideas about why Toyota deleted
> those components after 
> '89?  Alternator part numbers from the fiche are all
> the same, all 80A 
> except for a 70A version used in some N/A cars.  Any
> comments about ECU 
> interchangeability in general would be appreciated
> as well.
> 
> Thanks.
> 
>     BernieK
> 
> 
> 
> 
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  Malik
  It Ain't Eazy Being Me!!!!
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