Hondata

Check the battery voltage at the ECU using a multimeter during start and see what it is doing. It is probably dropping too low and that is causing the issue.


What you need to do is check the battery voltage to the ECU while the starter is cranking the engine.


Hi Guys,
2x New batteries, old ...

I second a function to disable that error, but I doubt is it possible as the error starts even before starting the engine.... have you tried to just put the key into ignition and wait (without starting the car). If you're like me, the error comes up during the electronics check, even when the ...

I have a similar problem.

https://www.hondata.com/forum/viewtopic.php?f=12&t=20276&start=15

Interested to see what you find. My voltage to the ECU is consistently about .1v to -.15v below the battery. I don't play with it too much as I still have my stock ECU that works just fine.


Yeah read ...

Unfortunately a new battery and a ecu clean didn't work.
I'll spam my own thread after this :)

Jocker_666 wrote: Thu Jun 22, 2017 11:30 am josaya don't know if You tried to clean Your ECU but maybe give it a go and it will help as it surely helped me.

Cheers for the heads up :D Will give it a go before ripping out all my wiring\cabling over the weekend.

This does not sound like an issue with the ECU or the K-Pro board, but the fact that the ECU is not getting high enough voltage when the K-Pro starts up to work correctly.


Voltage on ECU when not cranking is 12.7V btw.


Both of us are having ECU voltages of over 12.5V when the error occurs ...

This is actually similar to my issue in the other thread. I've been checking precrank and crank voltages (12v+ and 10v+). PRA ecu as well! Could it be an issue with the PRA ecus?

Out of curiosity, did this start happening after kpro updated their software in April/May? I see another that's about ...

It could be the battery , grounds or the wiring to the ECU. You will have to use a multimeter to try and find where there is resistance which is causing the voltage to drop.


Yeah I agree. Will be this weekend's mission. I suspect it is the battery or wiring to ECU, as grounds were recently done ...

https://www.hondata.com/techenginetuning.html is worth a read.
Playing with your vtec engagement point is also worth a shot, see https://www.hondata.com/help/flashpro/index.html?tuning_vtec_point.htm

Different setup, but it took me (complete noob) around 300 datalogs (revision 230ish! at approx 3 ...

So started perfectly and stayed perfect this morning (under 5 degrees) drove to work.

Upon return to vehicle 9hrs later, it started happening again. Except the check light has stayed on even when warm.


What you need to do is check the battery voltage to the ECU while the starter is cranking ...

Check the battery voltage at the ECU using a multimeter during start and see what it is doing. It is probably dropping too low and that is causing the issue.


Have checked both +ve from the ecu, both are 12v/14.2v pre/post crank (before and after the starter motor has clicked).

LED's on the ...

Ok, thanks again! Will have a look later in the day

Issue: on cold mornings <10 degrees C (50F) I normally let the car do its diagnostic check, then crank. Was faultless for a few months, then suddenly started going into limp mode within 5s of starting the car. It would go away when the engine is fully warmed up. Like https://www.hondata.com/forum ...

I installed a wideband, ran the ecu off it, and it went away....

Have since unplugged the wideband as have started running into a daughter board communication error which I'm about to enquire about.... That being said, the throttle lag hasn't returned so I'm really unsure what was the cause

Cheers for that, not exactly sure what lambda true is, but target is 13.2 and 13.

edit: that being said, I'll test https://www.hondata.com/forum/viewtopic ... IGN#p86302 out as well tomorrow if I can find what it matches to on a KPRO :O