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ECMlink First post! ECU question

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DP_52

Probationary Member
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0
Jun 28, 2026
Killeen, Texas
So, I recently bought a 1997 Eclipse GST with around 131k on the dash.

Swapped spark plugs and fixed the wiring.

The guy I bought it from had it wired to a stock (non socketed ECU).

I opened the old one (See attached).

The car will start with the stock one but will not with the DSMLink ECU.

Is there any easy checks to see if the original DSMLink ECU is working properly? It will crank with it hooked up but doesn't start. Before anyone asks no I did not get the cable to hook up and run DSMLink (sadly)
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Since that's a V3 DSMLink and that red board is the proof or purchase you can buy a replacement cable from ECMTuning.

The basic health check is the same as with a stock ECU. Does the CEL light turn on for 5 seconds and then turn off when you turn the ignition on? Does the boost gauge move to the zero and drop to the vacuum scale when you start to crank and return to zero when you stop?

It's not 100% clear, where did that ECU come from, was it installed in the car when you bought it?
You need to find out first how it's been configured and if any connector pins have been swapped since that's a 95 ECU in a 97 car.
 
Since that's a V3 DSMLink and that red board is the proof or purchase you can buy a replacement cable from ECMTuning.

The basic health check is the same as with a stock ECU. Does the CEL light turn on for 5 seconds and then turn off when you turn the ignition on? Does the boost gauge move to the zero and drop to the vacuum scale when you start to crank and return to zero when you stop?

It's not 100% clear, where did that ECU come from, was it installed in the car when you bought it?
You need to find out first how it's been configured and if any connector pins have been swapped since that's a 95 ECU in a 97 car.
So I bought the car from someone who was trying to get it running. The ECU in the picture is the one that was originally in the car before they swapped in a stock one.

Yes the CEL comes on for 5 seconds then goes off. I need to redo the boost gauge the previous owner had someone messing with a few things under the hood and couldn't get the car to run.
 
What year is it? Some of them have to reorder the plugs for the spark plugs.
There also a setting somewhere in there for a certain year that needs checked to fixed the CAS setup.
 
What year is it? Some of them have to reorder the plugs for the spark plugs.
There also a setting somewhere in there for a certain year that needs checked to fixed the CAS setup.
It’s a 1997.

You mean reorder differently from the
4-1-2-3 (or something like that
 
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