[urq] Looking for a MAC-02 for 1983 URQ

[Buchholz, Steven]

... that is not sounding good ... 

... I looked at the schematic I have and it looks like the switch inputs
go directly into a LSI device ... the input port the processor reads.
You may be looking at a new ECU after all ... 

It wouldn't hurt to hook the wires up and measure the resistance to
ground at the ECU end just to be sure ... 

The thing is your description of how it works makes it look as though
the WOT switch is "backwards" ... does the switch on your car have three
terminals?  If so, you could move the wiring loom from the "N.O."
contact to the "N.C." one and see what happens.  One other WAG ...
measure the resistance from the terminals on the switch to ground with
the wiring loom disconnected and the switch in both positions ...
perhaps there's some sort of internal short circuit in the switch to the
body ... extremely long shot I admit, but if it can exonerate the ECU it
is worth it!

Steve B
San Jose, CA (USA)
> 
> Here's what I measured:
> 
> Idle switch tripped, wires disconnected: 0 Ohms.
> Idle switch open (throttle partially open): inf.
> 
> WOT switch open(throttle at idle), wires disconnected:
> inf.
> WOT switch triggered, wires disconnected: 0 Ohms.
> 
> Thoughts?
> >
> > >From this follow on description I'm almost
> > completely convinced that
> > what you will find is that the WOT (FT) switch is
> > operating an a
> > normally closed position ... it should show infinite
> > resistance until
> > the throttle is opened far enough to engage WOT mode
> > ...
> >