Hondata

Solved my issues by replacing the main power wire - see my other post

viewtopic.php?p=138876#p138876

There was a voltage drop at startup, causing the S300v3 to bug out. I'll datalog to see if I still have any of the weird values above, but I think it's resolved.

Ok! Update.

So I never sent it in, because I was still suspicious that a voltage drop at starting was causing my issues.

It took a while to find the time, but I replaced my main power wire with a dedicated 2AWG starter wire, and 6AWG wire for the rest of the electronics.

It starts up great now ...

I've got the startup idle fixed for the most part, I had to re-set my idle and tune my IACV duty cycle.

Now, if it's around 45* outside, it will kick over and idle where it needs to be like normal.

Issue now is if it's under 40*, it will kick over but idle at around 1000 and slowly build up to ...

Well it looks like the battery was still having an issue. I experienced the voltage drop again, and dodgy starting. I've swapped out the AGM battery for a standard one and it starts up on the first crank, even cold. Have not experienced the bugging out yet either on the standard battery, but am ...

No, I wanted to rule out any electrical issues.

If that is the next step I'll be sending it in; Should the same RMA# work?

Hi,

This is a followup to this thread: https://www.hondata.com/forum/viewtopic.php?t=25009

I've been trying to address issues with my s300 module, but recently I had issues with warm starts. I tracked it down to a weak AGM battery, and was able to recondition it and resolve the voltage drop. Warm ...

You will need to figure out your wideband before continuing any tuning. Your voltage offset is huge - make sure your +12v signal is good and the ground is the same as the ECU (thermostat housing ground). I have a PLX and adjusted it slightly to get the hondata AFR to match up with what the PLX gauge ...

Thank you, I've been trying to drive it and be observant of when the issue occurs.

What will be done if I send it in for RMA again?

Before sending it in again I want to document the issue as best I can below, so maybe I can be pointed in the direction of more testing / logging / troubleshooting ...

I'm still dealing with this. When I notice it happening while driving, I turn the car off and back on quickly and it goes away.

I don't see how my car can be causing this if it is this sporadic and it clears up by power cycling. Everything operates normally afterwards.

I don't have another vehicle to try it on, and where I am, OBD1 Hondas that would use the S300 don't grow on trees.

And besides, that was done when I sent it in! Which is why I'm miffed that there is so little detail as to the testing that was performed when I sent my unit it. For all I know, it ...

I received my ECU from the Hondata RMA, reinstalled it and have been driving the car. Still having the issue.

One thing I tried was to restore my ELD resistors and move my wideband input to D12 since that is unused. That did not help, it's a cleaner install now but has not improved my situation ...

I had the same issue, and still do unfortunately. (I saw your PM about this, thought I would just reply in thread)

Changing to a different radio helped a bit, but lately I only listen to local stations or cassettes on mine. There is still a noticeable change in reception when the ECU is receiving ...

Thanks for all your help, the ECU/S300 is shipped off for the RMA. Hopefully the sensor issues can be identified.

Serial # is 42965

Here are pics of the soldering on the 1st ECU. It looks a little blobby because I reflowed it, I did this as part of my troubleshooting before swapping to a new ECU. It didn't help, but didn't change anything for the worse either.

IMG_20220427_115138358.jpg
IMG_20220427 ...

Does that really matter here? This same thing happens across 2 ECUs.

HAMotorsports socketed the first one, and it worked without issues up until this stuff started. I got the 2nd ECU from another seller and it was pre-socketed.

Suspecting issues w/ the socket etc, I reflowed the header pins and ...