AFK-S2K

So I have been doing a lot of research on adding multiple sensors to the AEM Series 2 EMS. The MAC EBC, SOS Flex fuel sensor and one of the AEM pressure sensors seems to be an easy hook up, all of which go to the "D" plug.

The problem im having is hooking up the second AEM pressure sensor which will be used for fuel pressure.

I have used this for a guide
https://www.s2ki.com/s2000/topic/961...s-2-explained/

so far i am planning on using the following:

EBC: D16, D13

Flex fuel (from the SOS guide): pwr: D4, Grd: D1, Signal: D11

Oil Press: Pwr: D6, Grd: D9, Signal: D8


By doing this, i am using "Avail, 5V sensor reference power" output for the Oil Pressure sensor.

There only seems to be one of these outputs on the "D" plug.?

so i looked into using this option for my second pressure gauge (fuel pressure)
https://www.s2ki.com/s2000/topic/737...-ems-question/


...but when i look at my HELMS manual it shows

C18 as a sensor ground, that seems OK, but i already have a wire here in my harness
C19 as a power source to my MAP sensor, of course there is already a wire in the harness here
c24 as a signal from the air pump, that seems OK since i deleted that

i also considered using C6 as an option for the pressure sensor signal input, as that is shown to be as "ADCR11 Input
Available, 0-5V in" according to the AEM Manual.

So.. where should i get my 5v power and ground source for this fuel pressure sensor?

all insight will be appreciated.

baZurk

Can you use power from the small fuse box under the steering wheel? There are three pins; 5v power, 5v accessory power (always on), and I think the third is ground although I'm not sure.

AFK-S2K

Those are 12V. Good for gauges...

baZurk

Oops you are right. Sorry about that. I went full derp on that one.

hybrdthry911

I wouldn't use D8 as your sensor input, it is wired for a resistor based input(typically a temp sensor) and not an actual 0-5v input, or so the instructions say (D8 --- ADCR14 Input Available, 0-5V in, 100k pull up to 5v). The 100k pull up changes the way the ecu reads this signal.

Just go with D7 or D15

AFK-S2K

OK. I must of overlooked that.

D7 calls out as "Avail, jumper set for 0-5V Input." Im not sure what "jumper set" means? will this have and effect of setting it up?

hybrdthry911

It means there is a jumper that would allow it to alternately route to a pull up resistor+5v signal to read resistance instead of a 0-5v signal.

Saw this a while back on s2ki. I don't have the link though, so don't know who to credit.

AFK-S2K

OK, so basically that jumper is available if needed, but is not currently hooked up to the resistor, right? it would have to be physically jumped inside the ecu, correct?


Im thinking about using the 5v power source from D6 for both the fuel pressure and the oil pressure. anyone see a problem with this? maybe to many amps being drawn?

that would leave me with:

Oil Press: Pwr: D6, Grd: D9, Signal: D15

Fuel Press: Pwr: D6, Grd: A7, Signal: C6 (ADCR11)

AFK-S2K

After hooking up power (5v) for both my oil pressure and fuel pressure to D6 i have had no problems.

so for information purposes, i have the following:

EBC: D16, D13

Flex fuel (from the SOS guide): pwr: D4, Grd: D1, Signal: D11

Oil Press: Pwr: D6, Grd: D9, Signal: D15 (BARO VOLTS)

Fuel Press: Pwr: D6, Grd: A7, Signal: C6 (ADCR11)


Now to figure out how to get the Serial Guage reading ethanol content.

hybrdthry911

Edited: See link below.