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Discussion Starter · #1 ·
For some reason my new laptop won't open my service manual. Hoping
someone can tell me a couple of things on my 9-3. First off, is the
PCM the same as the ECM/ECU? I'm getting a fault code P0606 and my
scanner reads "PCM processor fault". I need to figure out where the thing
is located...
Lastly, if it's the same thing as an ECU, can I change it without taking
the thing to a shop to get it to "talk" to my car. I see I can get a used
ECU off of eBay cheap enough.
 

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Discussion Starter · #3 ·
Hmm...I did see the link and wondered about it. I was wondering if someone
has actually installed a used unit before and had success with it.
Just what is the .bin file and how would one go about "flashing" it to
the new ECU?
 

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Hmm...I did see the link and wondered about it. I was wondering if someone
has actually installed a used unit before and had success with it.
Just what is the .bin file and how would one go about "flashing" it to
the new ECU?
A off the shelf used ECU won't work in a T7 powered car (such as your 01 9-3) It'd have to be married to the car with a Tech 2 unit.

The .bin file is the code the ECU uses to know what and how to manage the engine.

There's a freeware software package available called T7 Suite that will allow you to download the .bin file from one ECU, modify it in nearly any way you'd like and then upload that .bin file into another ECU.

Other than the software, you'd need one of a couple different hardware interfaces to get access to the ECU. JohnC at www.ecuproject.com has an inexpensive USB-BDM interface as well as a very nice combi adapter. Lawecil has a CANUSB adapter on the market as well.

There are also plans for DIY BDM interfaces that can be built very very inexpensively.

The BDM interfaces need a 10 pin header soldered onto the ECU's main board but offers a safer path.
 

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Discussion Starter · #5 ·
I should have updated my car list on this site. I'm working on my 2003 9-3
so does that make a difference with being able to install a used unit?
Thanks for the help...it's very appreciated as I'm in uncharted territory.
 

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I should have updated my car list on this site. I'm working on my 2003 9-3
so does that make a difference with being able to install a used unit?
Thanks for the help...it's very appreciated as I'm in uncharted territory.
Is that an 03 9-3 Convertible, or is it an 03 Sport Sedan?

Won't matter much, both the T7 powered vert and the T8 powered 9-3 SS will need to have the ECU cloned, or married to the car.

One difference in the ECU's would be the DIY software you'd use to clone your old into the new. Still freeware, but for a T8 ecu, you'd need the T8 Suite software package.
 

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Discussion Starter · #7 ·
processor fault 2003 9-3

Thanks...I'll look into that. I do have one other path to follow before
I jump into changing the ECU and that is chasing down another fault
that was generated. It's a P0638 and it's related to the throttle body.
In doing some searching, I noticed that, at least in some cars, and they
were GM's, the PCM is used to reconcile throttle position and in so much
it sums out feedback etc. There was also mention that there could be
a wiring or other connection fault between the throttle servo, pedal and
PCM.
It might be helpful if I knew where the PCM/ECM/ECU is located! Can
someone throw me a bone here?
 
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