Hondata

Martian wrote:I think you should try wiring the NB input directly into the harness @ the ecu. terminate any other connection past that point. At least then you have narrowed it down to that point.

did not fix same as last time.

Sorry dude, i'm completely out of ideas now.

Don't ever use T-taps as they will just cut the wire and never make a reliable connection.

ok never had an issue with one before but ill cut the jumper and splice in directly. will be back with results.

soldered the nb into D14 on the jumper harness and still the same result. anything else i can try??

anything else you can think of Spunkster? everything seems to work just fine except the 02 voltage? im loving the S300 except this issue.

At this point I would suggest that you take it to a Hondata dealer so they can look over the install and maybe they will see something that you have missed.

Spunkster wrote:At this point I would suggest that you take it to a Hondata dealer so they can look over the install and maybe they will see something that you have missed.

I dont trust our local Hondata dealer with bad past experiences. no other shop is close to me. and i would like to figure this out myself.

Ok i opened the case i did not do the chipping on this ecu i got this in a trade. Yes i have chipped ecus before doing crome turbo edit etc. SO i pulled out the s300 board and noticed that C51 & C52 are not there, shouldn't a .1uF Capacitor be in there places or do you guys not have this?

Also pulled the back off there is a red wire soldered across 74HC373 to another spot on the board then hot glued. i tried taking the best picture i could but didnt come out to well. there must be an answer for this.

The capacitors do not matter. Obviously there were some damaged tracks on the ECU that some one has tried to repair.

You really need to have someone else look at this as you may be overlooking something that to them may be obvious.

FreshDA9 wrote:ok i just got all my obd1 swap done and was datalogging but my short and long term fuel trims where at zero. I have the my PLX wired into D10 eld. but if closed loop is checked or unchecked nothing changes or even if i change my short trim adjustments still zero. am i not going into closed loop?

this is all sitting at idle and a few revs no load on here. my short fuel trim is set at 14.7 in the options but is around 15.5 and doesnt move if i change my short trim at all.

I just loaded your calibration and datalog you took while driving. Everything seems to be working fine. it just started short term trim. I will post screen shot. Are you trying to have the long term and short term trim autotune the map? Take a look at the eld input also it shows the voltage change.

ELD is changing with the Wideband as that is where i have the wideband input on. the short term on moved once and it was 1% and never again unless i have heater disabled. 02 volt is still off and i havent used autotune but the short term should compensate for what i have it set in my settings low load is 14.7 med is 13.2 and the last 1 is 12.5 over 2 psi i beleave (sorry im on my desktop not looking at my map). if im sitting at 13.8 the short term should try to adjust so it goes back to 14.7 my target A/F correct?

Changing the target lambda tables has nothing to do with what AF your car will run. It is used for datalogging purposes and sutotuning.

Spunkster wrote:Changing the target lambda tables has nothing to do with what AF your car will run. It is used for datalogging purposes and sutotuning.

How does Short Term and Long Term Fuel adjusments work in the S300? What sets there targets? or are they not used?

well i think i have figured something out. i listened to what jeff evans had to say and i took my multi meter and checked on the inside of the ecu well i looked at the laptop and the 02 voltage changed to .21-.43v when i touched it with the meter, but when i took it off it went back to 3.81v. so is there a ground i am missing? im going to look over the ecu pinout again and see if i ground the o2 or not.

O and Spunkster i did not know that i though those numbers where what the short trim would try to adjust to.

here is the recent data log of it.

i think it might be an ecu ill have to buy a spare and put my s300 in it. for some reason it works great if i put my multi meter to the inside of the ecu. but doesnt do anything if i hook it threw the wire to the pin? i tryed grounding my connector and nothing again. im going to try another ecu but what do you think?