AN1(D12 pin) input ethanol content anylizer

[aceman187443]

2 questions: i noticed looking over my sensors last datalog my ethanol content analyzer has not reading. It is hooked to pin D12 on my odb1 s300 ecu. i have the correct setup (caps and resisters) on the ecu to be able to read, but i don't see any reading in the senors. how can i check it is reading my zetronics sensor and display unit correctly. also when i hit the ac switch on i don't see the switch turn on or off on the sensors tab. i need to know the ecu is receiving the signals correctly before i dump in some e85 AND i need to know if the acsw is being read correctly. my ac is removed and i want to use the button to arm the nitrous. here is a datalog of me pressing the ac switch on and off every few seconds and have the zetronics gauge in a status of on and hardwired to D12 pin the AN1 input on my red board s300. thanks a million

[Hondata]

What you re-wired the AC switch in the vehicle? It will not work if you don't, because the AC thermo & pressure switches will prevent it from grounding.

hardwired to D12 pin the AN1 input on my red board s300

Is it connected to D12 or AN1? You need to use D10, D12 or B6.

[aceman187443]

No I did not rewire the ac switch, I was under the assumption that I could open the nitrous 1 tab and set the arming input to the ac switch, since that is a option under the input tab. Also for my 2nd question isn't d12 the AN1 input? I soldered in the proper cap in the proper location on the board so it would be able to read it. No voltage at all over the d12 is registering under the sensor tab of the manager. Thank you once again for the expertise on this problem!

[Hondata]

Ok, I was confusing AN1 on the s300 with Analog1 on the ECU.

The AC switch wiring needs to be altered. See this post for the wiring diagram. http://www.hondata.com/forum/viewtopic. ... 518#p63711

With D12 double check that you have got the correct pin input and that C42, which you added, is a capacitor not a resistor or a damaged capacitor. With a multimeter check for the correct voltage at pin D12. If that looks good sometimes you need to try a different ECU, but go through the steps first.

[aceman187443]

OK I just checked the ecu and the cap is defiantly a good and correctly installed cap(I've been working with electronics for many years, and pride myself in circuit building so I am 100% possitive the cap is right and that it is installed correct, also i know smanager has had its parameters double checked are set correctly. If the d12 pin is reading the analizer correctly it will show a voltage other than zero in the smanager sensor screen correct???? If I can't get it to read I'm going to throw my multimeter on the 0-5v output coming from the zetronics display(white/blue wire) and see what exactly it is outputting, but I've never had a prob with it before and has worked very well up to this point. Thank you so much once again

[aceman187443]

So it seems the zetronics gauge is outputting the correct voltage. Here is a link the vids I made hope it helps both of us get this issue taken care of. Thanks a million! https://www.youtube.com/watch?v=GMHlBbt ... ata_player

[Hondata]

Does the Analog1 (not AN1) voltage match the zetronics? If not then you need to try another ECU.

[aceman187443]

You lost me a little. You mean the large harness that plugs directly into the s300? Why would those inputs have a output? I have my gauges wired to those inputs so I can datalog. Im confused on where to check that voltage at you are asking for.

[Hondata]

Analog1 = ECU pin D12. AN1 = s300 analog input.

[aceman187443]

I have the zetronics hooked to d12 pin. The output from the zetronics is outputting about .4 of a volt since I have low content enthonal fuel rite now. So yes there is voltage being applied abd read by my fluke multimeter in the vid i attached, I have my jumper harness cut at pin d12 and the zetronics output 0-5v wire soldered and shrink wrapped there. The sensor tab in the smanager shows zero voltage as a reading on d12 pin even though I know there is voltage being applied to this pin. Any ideas on what I should do here? Is this what you are asking?

[Hondata]

If SManager is not seeing a voltage under 'Analog1' then it is usually the ECU.

What adapter harness? Let's start at the beginning. What vehicle & system do you have? You have wired to pin D12 on the ECU or the mystery adapter harness?

[aceman187443]

Its a Rywire direct jumper harness. It it just a extra length for cutting and splicing into if need be just like stock harness. I purchased directly from Rywire. I have it on a 1993 Honda prelude si 2.3ltr. Sorry I should have been more informative, probably spooked ya when I said jumper harness. Maybe it it would be worth tring the analog 2 (checking to see if i have the resistors) and seeing if it happens to read there. Seems to be a overall mystery. Ill let let yoy know what happens as soon as i get time to try it, just incase someone else bumps onto the same prob. Thank you

[aceman187443]

OK, so I've had no success getting the analizer to read properly so I'm going to upgrade to the white board s300. Now my question is before I do it, I see the white board wants the direct wire coming from the flex fuel sensor and a 2.4k ohm resister installed between the 12v pos wire and the sensor out, then the out going directly to the AN0. Problem: I have a zetronics display with a 0-5volt output to be hooked to a ecu for fuel comp, the sensor output goes to my display and if I use the sensor out instead of the display output and install this resistor it renders my display useless. What is the voltage range the white board s300 is looking for when i set AN0 to flex fuel sensor. Maybe I can get away with using by he displays 0-5v output and and still have operation of my display and a properly functioning s300. I guess what i really want to know is, what is the proper connection when using a zetronics display unit and a s300 white board?

[Hondata]

Did you try a different ECU?

The zetronics probably has its own pull up resistor. You can try connecting the sensor output to the s300 without the pull up. We did not test this configuration as the s300 was designed to connect directly to the sensor.

[aceman187443]

No I did not they my spare ecu because when I opened it up I seen someone had altered it, rendering it broken for now. I did not try the d10 pin because when reading instructions u seen it says remove OR replace with 1n4038 diode. The key was "or" I think it means "and". So it swayed me from doing that. Also the new white board has Bluetooth feature I've been complaining about now being able to use my note book and with the upgrade to the white board I can. I just have so much invested in this car that I want everything to function like Honda put it there from the factory. And this problem is a big problem for me. If worst came to worst with the white board I could purchase about he flex fuel sensor and use it stand alone to the ecu. I'm a little frustrated at the situation of having to get another ecu, socket kit, and install it all. I looking for a quick fix so everything works and I can goto the dyno with a running car that operates correctly.