I can do that...but it might take me awhile to get to it (we're talking
months here).

You can build a simple RPM simulator with a 555 timer chip and a handful
of other parts. It can even be variable. Let me know if you want the
pointer to a schematic.

Jon

On Wed, 5 Sep 2007, T.M. wrote:

> Volks, I repeat: I need the list's help to help me continue analyze the
> circuit. As a bare minimum, I need:
>
> >8. Now I need the list's help: I need voltage measurements from a known
> >good ISCU unit, to try and find where the problem hides. It's not very
> >difficult - all you need to do is connect a low power 12V source (wal-wart
> >seems safer than 12V from a big battery) to pins 15 & 31 as described
> >above, and tell me what you measure at all the other output pins. Also, I
> >need you to connect a low-power test light across the outputs (St1 and
> >St2) and tell me if it lights or not (it should IMO) or even a small
> >loudspeaker to know if it's a variable signal.
> >** be very careful not to short any adjacent pins so as not to cause
> >damage **
>
> This will also enable me to know I can continue analyzing on the bench
> (without the engine RPM signal) and not inside the van which is much less
> convenient.
> Any takers?...
>