Can an ECU from an automatic be used in a manual? - The Saab Link Forums

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Old 11-16-2014, 10:00 AM   #1
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Question Can an ECU from an automatic be used in a manual?

I have a manual 2004 9-3 arc convertible with gremlins in the ECU.
Besides stalling (with a few minute wait between allowing a re-start) the cruise control is dead and it throws a p0601 code.

Is the ECU the prime suspect, or are there other things to check first?

I can find many used ECU's on E-bay, but can only find ones from automatic sedans. They have the same part number 55353231.

Would there be any issues with remarrying them to my car?
Do they have to be divorced from the donor car first?

Thank you,

Last edited by Eisguy; 11-16-2014 at 10:29 AM. Reason: Clarity of problem
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Old 11-16-2014, 12:26 PM   #2
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you cannot use a manual ECU with an auto.

you can, however, buy an auto ECU and have it sent to a tuner to be flashed for your car.

you can also try making a post in the Wanted section of this forum.
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Old 11-16-2014, 03:26 PM   #3
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Actually you can. When the ECU is programmed to your car (requiring a dealer or qualified independent with a Tech2 and the correct software setup to give the Tech2 "Security Access" to your car) one of the programming steps is to select which transmission is fitted to the car, and the programming sets up the new ECU with the correct parameters.

The programming must be done regardless of the hardware configuration the 'donor' ECU Came from.

As Snowcat77 said, a tuner can correctly pre-configure an ECU also if you do not have easy access to a shop that can do the work.
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Old 11-16-2014, 03:55 PM   #4
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Originally Posted by DrewP View Post
Actually you can. When the ECU is programmed to your car (requiring a dealer or qualified independent with a Tech2 and the correct software setup to give the Tech2 "Security Access" to your car) one of the programming steps is to select which transmission is fitted to the car, and the programming sets up the new ECU with the correct parameters.

The programming must be done regardless of the hardware configuration the 'donor' ECU Came from.

As Snowcat77 said, a tuner can correctly pre-configure an ECU also if you do not have easy access to a shop that can do the work.
Can you swap t-5 ecus without marrying it?
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Old 11-17-2014, 10:52 AM   #5
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Can you swap t-5 ecus without marrying it?
pretty sure i did this in my 1997 Tally several times with no issue. it was just plug and play as long as it was manual program for a manual or auto for an auto.
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Old 11-17-2014, 12:19 PM   #6
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Yes, T5 can be swapped without coding, but the hardware configurations should match to make sure everything plays nice.

T7, T8, and ME9 all require programming when changing the ECM.
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Old 11-17-2014, 12:37 PM   #7
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pretty sure i did this in my 1997 Tally several times with no issue. it was just plug and play as long as it was manual program for a manual or auto for an auto.
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Yes, T5 can be swapped without coding, but the hardware configurations should match to make sure everything plays nice.

T7, T8, and ME9 all require programming when changing the ECM.
ok thats where i was a bit confused i was pretty sure i remembered doing that with my NGs. Im still learning the newer trionics.
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