95 LT1 PCM (16188051) uses a 16202476 MCU !!

[Ken Kelly]

Ludis,

	Do you know which Variant of the HC11 this is?

	The original posting was to try to identify which variety
of 68HC11 is in the 16202476? We are disassembling the 8051
EEprom, and the memory maps are different in the different
variants. We thought it was a 68HC11K4, but David Cooley,
thought that it was a 68HC11F1. Davids comments were based
on a P6 and I need to look at my board tonight, but I seem
to remember seeing P5 in the silkscreening.

		Ken

Ludis Langens wrote:
> 
> "David A. Cooley" wrote:
> >
> > I have 2 unidentifiable chips, 52 pin PLCC's, one is 56597 and labeled
> > Delco, the other is labeled NCR and is 129170
> 
> The ECM for the '95 2.2 L4 "4", 16191947, also uses a 16202476 and a
> 56597.  The 16191947  uses a MEMCAL with a 27_512.  I assume the 56597
> is a two injector version of the buffer / I/O port / peak+hold
> controller which all the P4's use.
> 
> Check the circuitry around the 56597.  Are there two diodes, two 1.8K
> resistors, and two polarized capacitors, all hooked together and to two
> pins of the 56597?  The old single injector controller uses these parts
> to implement a voltage doubler.
> 
> Other chips in the 16191947 are:
>      34987  O2 amp
>      34992  Power supply
>      34993  IAC driver
>   16045152  CD4011 quad NAND (?)
>      45153  CD4051 mux (?)
>      64606  ALDL interface
>      04891  ???
>      89551  ???
>   16132083  ???
>   16206550  ???
> 
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/