Martin,
The Signetics chip number doesn't match the usual EPROM or PROM
numbers, not even close, looks like it may be waht is called a
"house number", which is an internal partnumber between the
manufacturer and high volume customers. Does is have a transparent
window on the top? That would be the UV light earsure window for
clearing the data. The second and third lines look like date codes
- 1st week of 1990, and 34th week of 1989. Two date codes are
unusual unless it's a "one-time programmable" (no window), in which
case the earlier date is the manufacturing date and later date is
the programming date which ties to the data file they used. Can you
post a photo of the chip on the board?
Ron
From: Faulks <faulks_m@xxxxxxxxxxx>
To: tunerpro@xxxxxxxxxxxxx
Sent: Tuesday, August 18, 2009 6:00:06 PM
Subject: [tunerpro] Jetronic LE3 programming
Dear list,
Looking for some help, wish to program the Jetronic injection
system. I have a LE3 version fitted to a Fiat Uno turbo. The pcb
is fitted with a socketed 16 pin IC (chip), I believe likely a TTL
PROM or similar, and I know people have changed these for different
injector duty cycle - fuel maps etc. I have a standard chip and
wanted to experiment. My question, does anyone know and please tell
me what the IC is so I can purchase some blanks and start
experiment? I have access to EPROM and Prom programmers. The OE
programmed chip is a Signetics chip, with number: B57586 2nd and
third line: 9001 8934. Any hints or pointers would be very much
appreciated.
Thanks,
Martin
