im getting these afr rich spikes while test driving... and when i get the datalog, its showing a pulsewidth spike. some of the spikes are from accelenrichment, and some low spots are from decel... but i got these spikes for no reason. im posting a clip that i zoomed in on real good. i would say that i had a voltage spike i guess, but the rpm is rock solid. so any ideas?

 

as far as i know... the only things that would affect my pulse width are coolant temp, accel enrich. and ve i guess. but it is pretty irratic throughout, and is making my afrs really hard to control. obviously.

edit... and also staged injection. but that isnt happening here where i have recorded for your viewing pleasure.

 

ok ok... i did a bunch of complaining for nothing. i switched out the pulsewidth for dutycycles on the log viewer. duty 1 and 2 and i guess this shows primary and secondary fuel duty. and it looks like the spikes in afr and pw were due to the staged injection on/off. i need to see how to smooth that out some. ignore the secondary ignition portion of the datalogs... i do that just to clear some graphs off the screen, cuz i cant figure out how to get rid of the graphs once you put them up there. and that one seems to not be used in our/my application.

 

im back on my fan relay issue. i had to come back to this since i still am using a switch. i probed my circuit today and found that i have power coming from js0 through the 1K resistor to the transistor. at no coolant temp is the transistor letting the relay ground to ground on the board.

i have 88*C for my trigger temp and 6 is my hyst. in the settings under IAC2. when below my trigger temp, i probed about 13.7mV i think. when above my trigger temp, i get about 8mV. i think its mV on my multimeter. the setting says 2000m under DCV on the dial.

so js0 is putting out 13.7 mV when its not triggered and 8mV when it is triggered. this seems backwards. but anyway, its not enough voltage to make the transistor ground out. im concerned with why the voltage goes down and not up when it is supposed to trigger. but it does trigger when the temp reaches the trigger point.

maybe ken, do you know what the js0 output voltage should be when triggered? i need to dig up my pack of transistors and check the specs on it, to see where it operates. pretty sure i have the right series transistor.

thanks in advance

 

dangit

 

Any of the CPU output pins should be at +5v when they trigger.

The measured voltage may vary depending on what's hooked to the pin though.

Ken

 

then the only thing i can see is that my settings arent correct. i have them set up as directed, and im only reading mV when i test js0 pin even before the resistor. it doesnt matter whether its triggered on or off. i still get a mV reading. its more when js0 isnt triggered through IAC2 than it is when its triggered.

so i will post my settings. can you confirm that they are correct?

i did some research and it looks like i cant test for continuity on transistor using resistance test. like the way i see it, is that the material in the trans wont allow any passage through unless there is a proton and neutron supply. being voltage of course. ive been testing the ground/emitter, and collector for resistance continuity. and if there isnt any positive voltage at collector, then there wont be any flow of neutron from the emitter. but reguardless, there is no obvious sign of 5V coming from js0 pin before or after its should be triggered.

so yeah. can you tell me my settings are correct and if you have any ideas why i wouldnt be getting this 5Volts you speak of?

 

Actually, as long as you test in the right direction across the emitter and collector of the transistor, you can test using resistance (it's how I test mine).

Do whatever it is you need to in order to make the transistor output go high so the transistor is letting current through, then put the + on the side coming in from the relay, and the - on ground. You should get close to 0 ohms resistance.

Ken

 

ok. im going to mess with the transistor some. but i really need to get a decent voltage from js0 i think. you say it should be 5V on any output pin when triggered, and i dont get even 1V. so im going to play around a little and see if i can get 5V to come out of it. feel like im kinda pissing in the dark here. hope i dont get any one my shoe...

my internet will not be available for a while, as i have moved where there is no highspeed connection(country). and id rather have no connection instead of dialup. cuz it would just **** me off something terrible waiting for pages to load. cable company said they could connect me if i paid $3000 to have a line run another .25 miles. ***********! i think im going to rent a trencher and run it my damn self. so it maybe a couple days before i get back.

 

ok... with further testing: i have determined 1) with "power on" value of 1 and "trigger" value of 1, there is continuity with ground and js0 when not triggering IAC2. 2) with "power on" value of 0 and "trigger" value of 1, ground and js0 continuity happens when in trigger temp.

so the first setting of 1 and 1 makes sense, by displacing the 5V or whatever to ground when not triggered, and then allowing it to pass through js0 when it is triggered.

however; i tested voltage on js0 with the ground on proto area after removing the connection to the "fan circuit". so js0 is just a pin hanging off the bottom of my board now... i still only get mV when triggered and not triggered. tested about +14mV when not triggered at js0, and about -11mV when triggered. this really confused me. especially that i confirmed continuity with my settings and ground when not triggered. so there should be no voltage flow? i have my + lead on js0 and - on ground. i think im going to go buy a new multimeter. mine is old and i dont trust it anymore. its been dropped and kicked... ALOT. but it is pretty consistant. even after i smack it around some.

ken do you know how i can figure out what is happening to the 5V that should be on js0? i know its triggering at the right temps. the switch from +14mV to -11 happens at my trigger temp of 88* and returns to "off trigger" at 82* like i set it up to do. so the chip is doing its thing at the right time, but i dont seem to be getting the right voltage. so uh, yeah. hopefully you can hit me back before my net is discontinued today.

what are the possible reasons 5V would not come out of js0? is that even possible if its triggering properly?

or any other electronic genius' in this forum with some insight. its been too long since i took an electronics class.

 

Did you jumper the circuit that powers the stepper motor controller? I forgot off the top of my head exactly what pad you're supposed to jumper. I had the same problem on my mustangs MS and ended up soldering and unsoldering a bunch of components thinking that was the problem. Ended up, since I was using JS0, the stepper controller was not enabled on the board.

 

ahh, your results make sense now, you're running your input off the IAC chip on an MS2?

In that case, you should get +12v from that pin when it's on, and 0 v when it's off.

Also, IAC1 and IAC2 are reversed. So if you want something to happen on JS0, you need to use the settings in the generic port settings for "IAC2"

Ken

 

S12C needs to be connected to JS9, on a V3.0 board. If it's not connected you won't get 12v at JS0 in the "on" state like Ken describes.

 

its all making sense now guys. i have the v3 board, ms2 and i have been using the js0 pin for my signal. at this i havent been getting any voltage worth while to activate anything. i think the mV i was getting was my old tester just being quirky, because the js0 was switching between on and off. however, i did not have js9 and s12c connected. and if this is what supplies voltage to js0, then it makes sense why i was not getting a voltage.

i was not using the iac stepper controller. but i i guess if it switches on and off with the same output settings and supplies 12V instead of 5V or whatever... it would work to activate the transistor. so long as the base current doesnt over power the collector current.?.?

but yeah, ive been using iac2/pt7 settings in the generic outputs window. im connected to js0, but have not yet made the jumper from s12c to js9. i will do this in the next hour and maybe i can report back tomorrow or something. still no internet at home.

 

ok guys. i got the fan working with the previous few posts. that helped tremendously. got new brakes all around and new tires and im almost ready for inspection lanes. i just need to tweak my ignition timing a little. still a little weak on power. that i associate with my timing map. i believe it is rather conservative. id like to post my map but i cant. i still dont have any internet and im using my parents apple computer and dialup internet. and i dont know how to load my stuff on here. i have a memory stick but not sure if it will read on apple os. im using a map that is very close the the bdc extended port map. my aux ports are always open on my s4 na block, so its a little different i suppose. i do lose power the farther up the rpms i go. and i still am not running any boost yet until i get through inspection and can tune in my normal driving range. with no boost, i know that a little detonation wont really hurt me yet. i think around 5k rpm, im seeing mid 30's to low 40's advance. and at about this area, the motor is really struggling to get above that. it misses a lot despite my afr. i guess i need to get on the singles forum and research some more. i appreciate all the help guys.