S300 AFR Voltage issue P06

[EbrahimSR4]

Hi, hope someone can point me in the right direction. I am not reading the full voltage from the afr output. I have removed R136 and R138 as well as J2 and J3 on a P06 ecu. I have tried B06, D10, D12 and D14. The highest voltage I get is 1.8v reading through SManager. If I test with a multimeter the reading is 2.2 odd volts at the ecu pin, so the afr is sending the correct voltage. maybe some how I am missing something where the ecu is able to read the full voltage sent by the afr. Kindly see attached and advise me am I maybe missing something. In the sensor setting I have set display min to 0 and display max to 5. I have also tried using voltage adjustment but it does not come any where near the afr gauge.

on the current map and datalog my low cam is between 14.7 and 15.5 on the afr gauge and my vtec is on 11.5 to 11.8 on the afr gauge.

I have tried a number of basemaps and my old maps with no success, I am hoping to get to the tuner in a weeks time and would like to get this sorted before I go there. I have attached images and files maybe someone can see what I am missing.

I noticed with the ELD wire cut and ELD disabled in MISC tab I still get a reading of around 0.5v on smanager, wondering if this is normal.

AFR - PLX-SM-AFR
Engine B20Vtec high comp with pro 2's with stock injectors. not sure if any other info may be required
ECU - P06 with s300v3

[Spunkster]

All inputs except for the D14 input should be able to see the full 0-5v range. If you cannot go above 2.2 volt then it may be an issue with the output on the wideband.

[EbrahimSR4]

Thank you. when I use D14 SManager reads 1.8v however when I test the physical wire at the ECU D14 connector it reads above 2.2v inline with afr gauge reading. I have removed R136 and R138. Not sure if I should try reconnecting it and see if it does anything. Are there any other options to use or try.

[EbrahimSR4]

I think I have been using the wrong option. I think the Lambda Voltage is correct. I will test tomorrow and confirm.

[EbrahimSR4]

Okay I have tried the sensor settings and still nothing my lamda voltage is 1.54v when the afr voltage is 2.3v and the v offset does not help me. can I use the narrow band signal from the afr to datalog

[Spunkster]

In the calibration you have posed you are using the D14 input with a voltage offset of .61. First you should not use the D14 input as it cannot see the full voltage range. Second you should not have a voltage offset when it is wired correctly.

Use the ELD input instead and if there are still issues post the calibration used as well as a datalog showing the issue.

[EbrahimSR4]

Using D10 with eld disabled in misc tab. voltage still out.

[Spunkster]

Is the ELD wire cut or is it still connected to it's original location?

[EbrahimSR4]

ELD wire is Cut, so no connection between ELD and ECU port D10.

[Spunkster]

Have you measured the voltage using a multimeter to see what voltage is actually being output from the wideband controller?

[EbrahimSR4]

Yes the voltage measures with the reading of the gauge. when the voltage reads 2.3v the gauge is about 14.5 afr. The ground is attached at the thermostat housing. The voltage at the plxsmafr output is the same at the ECU input(D10). however the smanager reading does not read as high.

Am I correct in thinking the lambda voltage should show the full input voltage i.e. gauge 14.5 aft with output voltage at 2.3 and d10 2.3 the Lambda voltage should reflect 2.3v which is then translated into the AFR value's

[EbrahimSR4]

on the last datalog uploaded my idle afr was 14.5 on the gauge

[Spunkster]

Are you just converting the AFR to voltage or are you measuring with an actual multimeter?

[EbrahimSR4]

I am using an actual multimeter and checking the multimeter reading with what the gauge shows me.
I am looking between O2 sensor, AF and Lambda Voltage to try and align with the gauge.
voltage checked at both ends of the plxsmafr 0-5v output to ensure no change in between.

[Spunkster]

You can try another ECU, but there is nothing within the software that would cause this and since it is input directly to the ECU it has nothing to do with the s300 either.