Paul, most of the Nissan ECUs we are talking about are of the following 2 types:
1. EPROM chip soldered on the ECU. CA18DE(T) is of this variation. These need a reasonable mod: you de-solder the chip, solder a socket in its place (ZIF or whatever) and then you buy off-the-self EPROM chips and substitute your heart out. 2. NO EPROM chip. ROM part is included in one of the processor chips and is write-once. SR20DE(T) is of this variation. Processor chips are mucho expensive and the programmer that writes them much-more-mucho expensive. These need a more detailed mod: an additional daughter-board is purchased and soldered on a 40-pin position on the ECU board and then some additional wiring/resistors are soldered in the "right" places. Then standard EPROM chips are used on this daughterboard. Chris ----- Original Message ----- From: "Paul Stanley" <[EMAIL PROTECTED]> Subject: Re: nissan ecu editing software > I didnt know the factory chips are soldered in. It makes sense, a chip > socket will probably cause problems down the track... chip creep and > corrosion being the major factors. If the chips are EPROM (electrically > programmable read only memory) and cannot be erased (except with ultra > violet light) how do you tune them? Is there some other memory to hold > other variables? --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
