Where are my EBCM peeps at? 🤔

[AmunRoo]

So it appears that my ebcm has failed... I'm getting the trouble codes for the ebcm and I'm debating whether or not I should replace it. Does anyone know if it is part specific to the car or can we swap in an ebcm from a Cadillac DeVille? Doesn't require a relearned process? I have an ebcm from a DeVille sitting around.

[Paulaurora]

what year?

[AmunRoo]

My aurora is a 2003 and the donor may be the same year... 🤔

[AmunRoo]

Model: 12218170/25738079
MLCG: 25738079
Serial #41460259

Is what is on the donor ebcm

[phewop118]

Are you getting a U code indicating comms failure? Or multiple C codes? There's a ground that can fail due to corrosion, mimicking an ebcm failure. I honestly don't know which one, because my mechanic cleaned it up in minutes on the 02 4.0 when it was in for state inspection a few years ago. I can double check and let you know.

I will say, having replaced an ebcm on the Intrigue many years ago, a lot of ebcm 'failures' are really just wiring connectivity/continuity issues. If it's not power or ground, many of the signal lines are low current, and the terminals will get fretting over time, leading to high resistance. A good blow out of connectors with contact cleaner never hurts.

[AmunRoo]

I get codes C1214 and C1248...

[phewop118]

I think you wanna check G104. It appears to be on the lower front corner of the transmission,right where it meets up to the engine. Check for continuity to the connector at the ebcm. Appears to be two separate pins, F and G.

[phewop118]

C1214 appears to set when system voltage is below 8v, and c1248 indicates disabling of the dynamic rear proportioning function, which is done in response to the other dtc. Check power and ground connections first before replacing anything. Look for resistance on either. +V should be on pins A and B.

[phewop118]

Also note that pin B will only have voltage when the ignition is switched on, but pin A is straight to battery.

[AmunRoo]

Not to be a pain, but can you be a bit more specific? Am I checking this pins on the connection to the ebcm? Diagrams would definitely help

[phewop118]

I can see if I can get screen shots of the manual and post. For now, hopefully this gives you some more detail.

For the ground, you can start by visually inspecting the ground point. Then you can try disconnecting the connector from the Ebcm (with ignition off) and measuring for continuity with a multimeter between each ground pin in the ebcm harness and any good ground (unpainted metal). Should be close to 0 ohms.

For power pins, with ignition switched on, use the DC voltage part of a multimeter to measure voltage on the pins in the ebcm harness with respect to a good ground. Should be around 12v if engine is off.

If you still see nothing, get a good contact cleaner and spray out the connector (both the connector on the harness and ebcm) and let it dry before reconnecting.

[Paulaurora]

Hope those will help.. click on each one to zoom in and save.