o2 sensor only gets readings with revs then p0131

K-Series Programmable ECU installation questions / support issues
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JackSVM
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o2 sensor only gets readings with revs then p0131

Post by JackSVM » Mon Apr 10, 2017 12:47 pm

can somebody look through my datalog please. civic type r k20 kpro v4 on a basemap for a turbo setup.
my issue is this...
on start up the car idles nice but the short term trim creeps up to 46% and then throws the p0131 code on.
the o2 sensor doesnt get any readings unless i rev it which is weird.
iv also got an external wideband o2 and gauge frm AEM which also doesnt get readings unless i rev it......
i thought the bungs might of been too long but i checked them and they seem fine.
any help is greatly appreciated
thanks
jack
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Spunkster
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Re: o2 sensor only gets readings with revs then p0131

Post by Spunkster » Tue Apr 11, 2017 4:03 pm

What vehicle is this in? What ECU is this being used on?

JackSVM
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Re: o2 sensor only gets readings with revs then p0131

Post by JackSVM » Wed Apr 12, 2017 10:50 am

Civic type r 2003 PRA ecu with kpro v4

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Re: o2 sensor only gets readings with revs then p0131

Post by Spunkster » Wed Apr 12, 2017 4:24 pm

The PRA ECU does not have a wideband and will not give accurate AF ratios.

JackSVM
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Re: o2 sensor only gets readings with revs then p0131

Post by JackSVM » Wed Apr 12, 2017 10:11 pm

I know that when I mentioned the wideband I meant on a separate gauge that I have in the car. When I start the car the gauge will be at around 14.9 but around 5 seconds in it will go right down to 12.0 then just ---. Then if I rev it will change to about 13.0 and back to ---. Then in the datalog the narrowband is always at 0.00v ans if I rev it will go up to 1v and then back down to 0.00v.
Could it be that my base map is too far rich/lean and both sensors can't get accurate readings ?

JackSVM
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Re: o2 sensor only gets readings with revs then p0131

Post by JackSVM » Wed Apr 12, 2017 10:13 pm

Iv been looking at some other people's datalogs just to see their o2 readings and at idle they all seem to have a constantly changing reading around 0.5v

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Re: o2 sensor only gets readings with revs then p0131

Post by Spunkster » Thu Apr 13, 2017 9:41 am

All you can do is try to lean it our and see if it reads the changes.

JackSVM
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Re: o2 sensor only gets readings with revs then p0131

Post by JackSVM » Thu Apr 13, 2017 11:06 am

Ok thank you. I tried this earlier but it was increasing the fuelling and the o2 sensor started to pick up a voltage and I got it reading 0.4v at idle but as soon as I cleared the p0131 code the o2 reading went back to 0v 😩
Maybe the mapper will fix this issue with my dyno day next week.

JackSVM
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Re: o2 sensor only gets readings with revs then p0131

Post by JackSVM » Sat Apr 15, 2017 10:55 am

ok so PROBLEM SOLVED if anyone else ever reads this and is having the same problems on a BASE MAP

turns out my base map was miles out and it was running super lean.
easiest way to tell is take it to a garage and ask them to put the emissions testing machine on it.
mine was running 1.4 - 1.6 lambda which is around 20:1 - 23:1 AFR!
added a load of fuel into the 0 deg cam angle low fuel table map and bosh, widbeand gauge starts working and narrowband o2 sensor starts giving a constant reading to the ecu.
thanks for the help tho guys!

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