1G Broken cables?

[Willosch]

So after my engine gave me code: 13,14, 21 and 25 I have changed every part for it.

13 and 25 the LMM,
14 the throttle position sensor,
21 the coolant temperature sensor.

But nothing worked and my engine still tells me this codes after reset.
So I thought my ECU could be broken.

Now I have unplugged my ECU and looked inside if something is burned or broken. But it seems like there is nothing wrong. And now I have no idea what my problem could be except broken cables.

Can someone tell me how to test broken cables?

Or maybe you have other ideas?

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[DSMPT]

I would check blown sensor ground first. Please refer the link below.

blownsensorground [ECMTuning - wiki]

www.ecmtuning.com

 

[Diamond Star Werks]

Pins 14 & 24 on the 24 pin ECU connector are your sensor grounds. Backprobe and check them for ground. Or you can disconnect just the 24 pin connector and check for continuity to ground directly on pins 14 and 24.

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Sensor grounds trace

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[Willosch]

Pins 14 & 24 on the 24 pin ECU connector are your sensor grounds. Backprobe and check them for ground. Or you can disconnect just the 24 pin connector and check for continuity to ground directly on pins 14 and 24.

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Sensor grounds trace

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Could you explain to me what backprobing is?
And for my understanding, I think just getting a new Ecu (working) would solve my problem?

 

[pauleyman]

Could you explain to me what backprobing is?
And for my understanding, I think just getting a new Ecu (working) would solve my problem?

backprobing - Google Search

 

[Willosch]

So... After a little Winter Pause i have probed the sensor ground cable for continuity with every sensor it is connected to and it seems like my cables are working fine, I'm getting with every sensor a constant beeping sound.

But I only checked pin 24 I will check the cables on pin 14 today and after that i will try to do the same on the ECU.

Well I have no Idea, I have checked the continuity from pin 17 (the other ground sensor) with every sensor and I have checked the continuity from pin 24 and 17, I get a constant beeping from my multimeter.
It seems like there is nothing broken, but something has to be?!

I'm thinking about sending my ECU to a ECU Shop to let someone professionally check it.

Are there any other possibilities what my problem could be?

 

[steve]

Your capacitors have leaked and among other things attacked the voltage reference for the ADC (analog to digital converter) in the microprocessor. That's going to cause fault codes. You can see how badly C19 by the lower right corner is corroded.

Time to have that ECU fixed or replaced. From what I can tell that ECU should be the most common 1G ECU in Europe.

 

[CKOPOCT]

Your capacitors have leaked and among other things attacked the voltage reference for the ADC (analog to digital converter) in the microprocessor. That's going to cause fault codes. You can see how badly C19 by the lower right corner is corroded.

Time to have that ECU fixed or replaced. From what I can tell that ECU should be the most common 1G ECU in Europe.

It looks like nearby C4 is also pretty nasty, yes? Both are located in the top left quadrant of the picture, near the large square MH6111 processor.

 

[steve]

It looks like nearby C4 is also pretty nasty, yes? Both are located in the top left quadrant of the picture, near the large square MH6111 processor.

Yes, C4 and C14 and R46 and R32 and all the vias on the +5 and ground traces. First thing is pulling the capacitors and cleaning the board then seeing the extent of the damage. Anything that isn't shiny metallic colored (solder or copper) needs attention.

 

[Willosch]

thanks in advance, I'll write again when I have new information as soon as I've repaired it

 

[Willosch]

Well, I've forgot to take a photo when the ECU was out, but I have generally cleaned the whole ECU from as much corrosion as I saw with isopropanol and changed the definitely broken capacitors with new ones. And now, after putting the ECU back in and resetting it... Nothing changed :/
It's still only starting with effort when it's cold and sending me the same error codes like before.

I'm kinda looking at a blank wall here, should i consider getting a new ECU or getting mine professionally looked at?

Or could there be any other possibilities now?

 

[steve]

It should have been professionally looked at but at this point I suggest you source a good replacement. Make sure to have the capacitors replaced on it if you find a clean one so the same won't happen.

I'm pretty sure the issue is with the corrosion around C19 and the potential for the microprocessor's ADC voltage reference to be disconnected from it.