Nope it will not work because your ECU (5902) is California emission and the (5903) is for Federal emission...you will have to reroute your emission hoses

here is the link for ECU Part Numbers: http://www.vfaq.com/mods/ECUs.html

hope that helps you out

Originally posted by DeezNutzGSX
Nope it will not work because your ECU (5902) is California emission and the (5903) is for Federal emission...you will have to reroute your emission hoses

here is the link for ECU Part Numbers: http://www.vfaq.com/mods/ECUs.html

hope that helps you out

Click to expand...

Well shit.

That blows. Thanks for the info anyways, atleast it's a means to an end

Anyone got a 5902 ECU they want to offload?

Sorry to disappoint you have you tried www.DsmTrader.com but be careful on who you buy from...make sure their address is not a PO Box, I don't trust PO Box mailing address. Try getting their phone# also and talk to them see if you can trust the person.

Good luck with your hunt

Where are you getting the 5903?

I need one of those!

If you can't use it, maybe I can?

will the 5902 ca work in the 5903 federal with out changing any thing i have a eprom one and i want to use it but i dont wanna change any thing ?

The only way it will work is if you solder in a 1k resistor in the R129 position on the circuit board.

http://www.dsmtuners.com/forums/showthread.php?t=138998

i dont think you understood on 1990 ecu r129 doesnt effect the cali or fed status. if it would i wouldnt be lookin for a 1990 fed eprom cuz i have 2 calis and i dont want to put on all that bs. id pay money to the first person who could tell me how to put a 1990ca in my fed car.
chris

My previous statement was incorrect, you are right. On the 90's the only way to change it from ca to fed or visa-versa is to reprogram the eprom chip I believe. There is a real DSM ECU guru roaming these boards who goes by the name of steve, perhaps he will jump in or you can PM him.

cbassgsx said:

id pay money to the first person who could tell me how to put a 1990ca in my fed car.
chris

Click to expand...

You could always put the CA EGR valve and Solenoid in and run a CA ECU

Ya, I did think so either.

Steve

to clarify i wasnt trying to call you out roastbeef i was just trying to stop the spread of the wrong info.because in hours using my big s button i have seen peole told to do that at least a dozen times. it also says that it works for 90-94 in a few other sites but i cant find it and i dont want to point the finger the wrong way.so could a new eprom change that? does keydriver do that???
chris

What exactly are you asking?

Steve

RoasT BeeF said:

On the 90's the only way to change it from ca to fed or visa-versa is to reprogram the eprom chip I believe. .

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i was asking for somebody to verify thisor if keydriver did this.
thanks for the help

Anybody who can burn an EPROM can convert a '90 CA spec EPROM ECU to Fed spec.
I'm in the process of socketing and burning a new chip for a MD145902 right now.

Steve

cbassgsx said:

to clarify i wasnt trying to call you out roastbeef i was just trying to stop the spread of the wrong info.because in hours using my big s button i have seen peole told to do that at least a dozen times. it also says that it works for 90-94 in a few other sites but i cant find it and i dont want to point the finger the wrong way.so could a new eprom change that? does keydriver do that???
chris

Click to expand...

I understand that. I totaly forgot about this thread until you brought it back...when i originally made my first post about the resistor I thought that was correct, I have since learned that on the 90's just changing the resistor does not always work. Therefore I corrected myself.

As far as the converting of the chip I believe steve can do this. If you plan to get a keydriver chip all you have to do is when ur filling out the order form and it askes you the original EPROM chip number you just say that you have like the E931 chip which would be the 91-94 FED code. Then all you have to do is solder in the resistor and you are done.

Make sense? steve, help me out here.

hey ill buy that 5903 from ya!

drewmen19 said:

hey ill buy that 5903 from ya!

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After 5+ years he might not have it anymore. I've got the non-EPROM ones but good 90 EPROM ECUs are hard to come by nowdays.

you have to take it out and open it up to find out if it's E-prom right?

drewmen19 said:

hey ill buy that 5903 from ya!

Click to expand...

I have a 90 Eprom forsale, $250 shipped.

gingerbredman00 said:

you have to take it out and open it up to find out if it's E-prom right?

Click to expand...

That's the only way to be 100% sure.