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Sensors failing

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Social_ENjustice

New Member
Aug 10, 2024
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22 Elantra N M/T. Have a lot of work done to this vehicle so it’s not a reflection of all EN’s. I’m not sure anyone else would’ve even had this problem.

I have 4 sensors failing in my engine (camshaft, intake manifold, manifold runner and one other). I just did a bunch of work done in my engine bay and my ECU is flash tuned. I know the problem isn’t the wiring harness or the battery otherwise I would have more issues. Fuses are good. Everything is plugged in and has connectivity.

I have somewhat narrowed it down through my own diagnosis to an issue with my ECU, the tune, and the signal it’s sending to my sensors. My question for the community is: does anyone know how/if I can reset the ECU to factory settings (in hope that the sensors and ECU will reset together)? Will this just destroy my ECU and sensors?

Disclaimer: no I don’t have warranty and I refuse to take it to any Hyundai service department.

Thanks fam
 
Ask whoever flashed it previously, did they backup the original settings?
 
I flashed it. I have the stock ECU Map backed up on a file on my computer.

I considered reverting back to stock. But you’re not supposed to re-flash the ECU if there is already an issue(CEL) present. At least that’s what I was told, never tried.
 
The cels won’t clear. A buddy of mine even brought over his Topdon to clear them. Nothing.

My tune files and flash device are commercial, and from the same manufacturer, and designed for my year make model.
 
Were the issues present before you did "a bunch of work" on your engine?
Is there a common link between the failing sensors: wiring, plug, voltage source?
If you purchased directly from the tuner company they should be able to provide answers.
Even if you didn't it can't hurt to ask them for advice.
 
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I can't think of any reason why you can't reflash the ECU regardless of cel codes, it doesn't appear logical to me.
 
tacthecat said:
Were the issues present before you did "a bunch of work" on your engine?
Is there a common link between the failing sensors: wiring, plug, voltage source?
If you purchased directly from the tuner company they should be able to provide answers.
Even if you didn't it can't hurt to ask them for advice.
Click to expand...
The issues were not present before.

The common link is what I looked for initially. Made sure the battery was pushing the right voltage. Made sure the plugs were operational and were getting the voltage. Checked all the fuses. Figured it has to be the ECU, and that’s when I created an account on here.

The Tune company is no help. Not even an option unfortunately.
 
Jajodu said:
I can't think of any reason why you can't reflash the ECU regardless of cel codes, it doesn't appear logical to me.
Click to expand...
Reflashing the ECU adjusts the settings of the engine. If my settings are already malfunctioning I don’t want to try to change them.

I was hoping to find a way to reset the ECU to factory, not reflash it. Zero out all the settings, the sensors, the tune, everything. Then do some drive cycles.
 
Before you condemn the ECU ($$$$) take a hard look for a common link for the sensors that are having issues. List those "failing" and see where the common pathways wiring/connectors are and recheck for broken, or shorted, wires or bent/recessed pins in the connectors. This is very likely something you disturbed while working on the car and might not even be something you were working on (think pushing a harness out of the way to access a bolt/coupling etc.) Access to a vehicle wiring diagram could help and "take a look" at sensors that are working to narrow down the trobleshooting path. Most of us have learned that doing "one mod/fix at a time" then making sure everything is still working before doing more work actually saves time and lots of anguish.
 
tacthecat said:
Before you condemn the ECU ($$$$) take a hard look for a common link for the sensors that are having issues. List those "failing" and see where the common pathways wiring/connectors are and recheck for broken, or shorted, wires or bent/recessed pins in the connectors. This is very likely something you disturbed while working on the car and might not even be something you were working on (think pushing a harness out of the way to access a bolt/coupling etc.) Access to a vehicle wiring diagram could help and "take a look" at sensors that are working to narrow down the trobleshooting path. Most of us have learned that doing "one mod/fix at a time" then making sure everything is still working before doing more work actually saves time and lots of anguish.
Click to expand...
I agree with all that you are saying , but if you read he original post the OP says he's done all of that.


I have 4 sensors failing in my engine (camshaft, intake manifold, manifold runner and one other). I just did a bunch of work done in my engine bay and my ECU is flash tuned. I know the problem isn’t the wiring harness or the battery otherwise I would have more issues. Fuses are good. Everything is plugged in and has connectivity.
 
We won't know until the unique cause is found - Why would the ECU fail only 4 sensors and be on a circuit that has 3 of 4 items in the same general area of the engine (common wire(?) GOK where/what "one other" is. As with all issues find the lowest common denominator and go from there. A bad ground somewhere is not out of the question.
 
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