MemCals Needing a Good Home...

[Walter Sherwin]

The NETRES is part of an analog complex circuit which attempts to drive the
physical hardware in the event of either a CPU failure or an EPROM failure.
The intention was that the resultant fueling, together with the base spark
from the ignition module/system, would get a person from unknown
destinations to at least a service repair facility.  Yes, it requires that
the hardware is "okay"  and specifically it assumes that the TPS, CTS, and
MAP (or MAF) are okay.

Ludis has some schematics for this on his site for certain ECM's, and there
are a number of discussion threads throughout the old archives.  As at yet,
I'm not aware of anyone who has post calibrated this feature (although I'd
like to be corrected on this point if anyone is willing......).

Walt.


> Has anyone been able to come up with a pinout and/or internal connection
> diagram for the netres?  And while we're at it, could someone explain HOW
> a resistor network provides a malfunctioning ECM with the ability to "limp
> home"?  Maybe I'm just misunderstanding the function of limp home mode,
> does it require that the hardware is OK, but the data in the PROM is
> corrupt?
>


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