Hi,
I'm running the wideband analog2 of an innovative lc1 into the D14 O2 input of an S300 in p72. Will the ECU limit the voltage resolution of the input to 3.85V ?
I have programmed the lc1 to 0-5V=7.35-22.35 but the datalogs still read 3.8V from the O2 at maximum.
If the ECU is limiting, which pin is the easiest to switch to... B6 ?
D14 input limits wideband O2 voltage
D14 input limits wideband O2 voltage
Trying hard to think I'm fast....
yes,D14 is limited to about 3.8V max,just the nature of that circuit.
0-5V,10-20AF will see u missing readings above about 17.5AF.
Do u really need to see data above 17.5AF on your car?
Only time u will see above 17.5AF is if u are way lost on the tune or need to log your overrun fuel cut for some unknown reason.
Just move to D10 if u really need it,or want the D14 for closed loop operation.
U will have to check if the D12 or B6 circuitry is enabled in the ECU if u choose to use 1 of them.
I know my LC-1 wont read thru the D10 correct no matter what i try,that is with a JDM P72,be interesting to know your results & what P72 model u have if your LC-1 works correct on D10.
Im just about to try enable my D12 circuit & try that & see if it works,dont know why im bothering,i doubt im gonna tune the car any further,was a major PIA street tuning on just a gauge,guess i just wanna defeat this D10 mystery problem.....
0-5V,10-20AF will see u missing readings above about 17.5AF.
Do u really need to see data above 17.5AF on your car?
Only time u will see above 17.5AF is if u are way lost on the tune or need to log your overrun fuel cut for some unknown reason.
Just move to D10 if u really need it,or want the D14 for closed loop operation.
U will have to check if the D12 or B6 circuitry is enabled in the ECU if u choose to use 1 of them.
I know my LC-1 wont read thru the D10 correct no matter what i try,that is with a JDM P72,be interesting to know your results & what P72 model u have if your LC-1 works correct on D10.
Im just about to try enable my D12 circuit & try that & see if it works,dont know why im bothering,i doubt im gonna tune the car any further,was a major PIA street tuning on just a gauge,guess i just wanna defeat this D10 mystery problem.....
-
boostedcivicsir
- Posts: 78
- Joined: Sun Feb 22, 2004 1:20 pm
Boostedcivicsir, as a matter of fact, I do have issues with the LC1 O2 and Datalogging results. I have calibrated the O2 often and checked for voltage offset issues (which happen when I have 2 or more accessories running (lights/ac/radio). I try to tune with none running. Even after some crusing around and comparing AFs... after a WOT pull or two, I will glace at the numbers and they sometimes read VERY differently. Sometimes well over an AF point difference. The XD16 gauge seems to be spot on the money, but Hondata readings are the ones that are off.
The reason I am concerned with the 0-3.85 limitation is the resolution that it presents to the software. The gauge is saying 0=7.35 and 5= 22.35 (or whatever someone would set it to), so the output is also programmed with this. Even setting 14.7 stoich to a particular O2 output (2.04V ?), the resolution the software sees might be incorrect. SO I suspect the gauge is right, but software's translation is not accurate. (Someone please correct me if this is wrong).
Parameter settings right now are:
0V=7.35AF
2.63V= 15.10AF
5V= 22.39AF
I will change the LC1 output to 3.85 max and do the same at the parameter window to see if it helps, but I believe I've done that before with similar issue.
Have either of you tried B6 which is an empty pin (not sure what that means)
The reason I am concerned with the 0-3.85 limitation is the resolution that it presents to the software. The gauge is saying 0=7.35 and 5= 22.35 (or whatever someone would set it to), so the output is also programmed with this. Even setting 14.7 stoich to a particular O2 output (2.04V ?), the resolution the software sees might be incorrect. SO I suspect the gauge is right, but software's translation is not accurate. (Someone please correct me if this is wrong).
Parameter settings right now are:
0V=7.35AF
2.63V= 15.10AF
5V= 22.39AF
I will change the LC1 output to 3.85 max and do the same at the parameter window to see if it helps, but I believe I've done that before with similar issue.
Have either of you tried B6 which is an empty pin (not sure what that means)
Trying hard to think I'm fast....
Could i ask is that a JDM P72 your running or US?
U describe exactly the problem i have,the XD-16 reads about full 1 point richer at WOT,but both readings match at stoic.
Is this what u see?
The D14 limitation will just see your readings topping out at 3.8V,it should still read correct below these values,so long as the voltage conversion info u have entered under the closed loop tab is the same as what u have the analog output feeding to D14 set to the same slope on the LC-1.
It doesnt matter whether u have 0-5V or 0-3.8V values set,as long as they match.
The XD-16 makes a serial connection to the LC-1,so its settings & readings are totally independent of the analog output settings in the LC-1,so u can treat them separately.
I have verified against other equipment that the XD-16 is reading correct & hondata wrong,so u are probably correct in assuming this also.
I have also verified the analog output voltage readings to match what the XD-16 is saying as well.
Something just goes amiss once this info enters the ECU.
I have been using D10 input for these tests.
B6,is a deadend on the circuit board in my ECU,u will have to open yours up & see if it is the same.
I dont know what the original intention of B6 was,i assume it is maybe an auto tranny input of some sort.
D12 EGR input could also be a dead end,u will have to check this also,but if u would like to enable it,u can find some more info of my journey along the D12 path here below
viewtopic.php?t=8259
U describe exactly the problem i have,the XD-16 reads about full 1 point richer at WOT,but both readings match at stoic.
Is this what u see?
The D14 limitation will just see your readings topping out at 3.8V,it should still read correct below these values,so long as the voltage conversion info u have entered under the closed loop tab is the same as what u have the analog output feeding to D14 set to the same slope on the LC-1.
It doesnt matter whether u have 0-5V or 0-3.8V values set,as long as they match.
The XD-16 makes a serial connection to the LC-1,so its settings & readings are totally independent of the analog output settings in the LC-1,so u can treat them separately.
I have verified against other equipment that the XD-16 is reading correct & hondata wrong,so u are probably correct in assuming this also.
I have also verified the analog output voltage readings to match what the XD-16 is saying as well.
Something just goes amiss once this info enters the ECU.
I have been using D10 input for these tests.
B6,is a deadend on the circuit board in my ECU,u will have to open yours up & see if it is the same.
I dont know what the original intention of B6 was,i assume it is maybe an auto tranny input of some sort.
D12 EGR input could also be a dead end,u will have to check this also,but if u would like to enable it,u can find some more info of my journey along the D12 path here below
viewtopic.php?t=8259