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

[Ludis Langens]

"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/