Setting up a 1227749 on the bench for testing.

[Bruce Plecan]

Can be difficult in that some ecms expect a Test signal back from it.  ie
within a certain time period it will send an extended PW to the injectors
and it expects a O2 signal to relfect that.

On some cals, you can just run a take off from the injector pulses, to
*flash* an LED.   ie 1K resistor to LED and then LED to ground.     Now this
will give you a 1.8v drop across the LED.   Run two 10K resistors across the
LED, and you have a pulsed .9v.    The 0-.9v swing works for a similated O2
feedback, on many ecms, but not all.   When doing 749 stuff I generally
disable the 13-44-45 trouble code
Bruce


> Is the stim board mentioned below, fairly easy to adapt for general bench
> testing of GM boxes?  I see that the stim board supports 48 & 60 toothed
> crank wheels and cam sensors and such, but, will it also handle the old
> dizzy stuff and interface readily with the older GM boxes?
>
> While on the topic of test benches, what's the best way to simulate the
C/L
> O2 signal?
>
> Walt.
> > Hi Brian,
> >
> > I'm using one of Jeff Clark's stimulator boards he designed for the
EFI332
> project on my '748 bench.  It needs a couple of minor modifications,  but
> gives me pots for RPM, BARO, Coolant temp, TPS, Air temp, and MAP.  Last I
> knew he still had a few bare
> > PCBs available.
> > hth,
> > Bill
> > Brian R.Dourty  wrote:
> > > Date: Wed, 28 Mar 2001 09:28:42 -0600
> > > From: "Dourty, Brian R. (IATS)" <DourtyB at missouri.edu>
> > > Subject:
> > >
> > > Hey all,
> > >
> > > I'm interested in setting up a 1227749 ECM on a bench for some testing
> and
> > > to get a better idea of how it works. I guess what I'm really looking
> for is
> > > a how too. I've got a complete set of sensors, injectors, ECM, and
> > > Datamaster. What else do I need. (Besides a 12 volt power supply) :-)
> What
> > > would be a better substitute for the sensors that would allow me to
> change
> > > their values?
> > >
> > > Brian Dourty

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