Renault 25 V6Turbo | The ECU Is Not Supposed To Smoke Right?
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- Опубликовано: 3 окт 2024
- I am trying to fix my uncontrolled idle issue on the Renault 25... But the succes is limited!
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With the benefit of hindsight, it might have been good to run it for longer without the control valve connected and then check the component. If it did not burn out, then you could presume that the valve is the overload, or if it failed it is due to other components within the ECU (capacitors maybe). You will get there- I have every confidence.👍
For PCBs that are at risk of damage from further rework you can use 2.54mm pitch SIL strip you can break off with pliers to make the fixed component socketed so you have the option of repeated replacement during attempts to fix the root cause elsewhere.
Reverting to non-socketed at the end is ideal unless the strain/vibration relief and heat dissipation is adjusted to deal with the socketed use.
@mrreno139 a.k.a. Paul is the godfather of old Renaults here in the UK. He might have useful ideas on parts/supply/root causes
I think the phrase is "The operation was a success, though the patient did not survive.", as for what caused it, I'd be looking for other components in the ECU that are shorted to ground causing the part to overheat and burn like that, but, there's also another possible issue; fake parts, there have been a glut of fake electronic components sold online in recent years dressed up to look like the real thing (either painted or ground down, then re-etched with a laser), and what they use could be absolutely incompatible with what they're alleging to be, or they're old but re-marked parts that have been harvested that were about to fail regardless, causing problems like what you had there, it's a bit of a minefield finding genuine components affordably, especially when the fakes are far cheaper than a reputable source...
This needs Adrian in his digital basement to check the ecu over. Have you got access to schematics for the ecu and what other parts that burnt chip talks to? It could just be a faulty voltage regulator or a resistor or capacitor that are overloading the chip. I would think that a fault in the big wiring loom would blow a fuse before it set fire to small 5v ic in the ecu? Good luck 👍.
I do auto electrical repairs and I'd be VERY cautious with that ECU because it's a super-rare-part and as it's "mostly working" I'd confine repairs to the bit which isn't
Even then I'd be careful because IT RUNS and we'd like to keep that happening even if we have to bodge the idle control valve ;0
The part you replaced is some sort of triac/transistor - if it's burning-out it COULD just need better cooling (no harm in thermal-pasting it) or it could be a capacitor has failed which smoothes the supply/prevents inrush or the valve itself may just be pulling too-much current so you have to properly reverse-engineer the thing...
I'd recommend a collab with someone who does electronic repairs who can deduce what's going-on around that part - I could list many candidates but they're all US or UK based and I'm sure there are Danish channels handier for you!?
I'd call that progress;
Clear nail varnish works on solder repairs.
I think you've either got a dry solder joint or dead caps on that board. I would look carefully at the back and re solder first.
The capacitors must be replaced. They are most likely dried out after all these years.
8:12 No!!! no no no no no no no no no... Those solder joints have bridged. Oh mate I would have done it for you. I used to do this kind of work all the time.
This is just like me.. We call it "chasing your tail".. just like a dog does, going round and round in circles.. (Phil)
The chip is a driver, it look like valve run too many current for any reason, i will check the valve consum before replace the driver again
I would check for a damaged wire that shorts to ground.
It's not meant to smoke, but it is French so...
.. smoking is still cool
@@loserownysmoking is cool.
Thanks for all the input doing the live chat...
The idle valve... is it the correct one?
Is there a short?
bad earth?
Stupid French stuff?
What's the cause!?
The idle valve has to be in Init position. It probably wasnt and ecu wanted to move It more. And the valve was at the end. And the driver in ecu burned.
What about going aftermarket with something like a Speeduino?
can it be that the heatsink should not be grounded? that there maybe should be a mylar insulator between the heatsink of the driver and the chassis of the ecu body ? (have a look on another ecu which hasnt been repaired.)
Sorry you did not find it
Too new a car, avoid cars with more electrical stuff than just lights.