5V source for logging fuel pressure?
Thread Starter
Drifting
Joined: Sep 2005
Posts: 1,258
Likes: 0
From: Home Southern Maine
St. Jude Donor '08
5V source for logging fuel pressure?
I am trying to use an autometer 2246 sending unit for logging fuel pressure (no gauge). There are three wires to the sending unit Black grey and Purple. Black is the ground, purple is the sending unit Volts for the appropriate pressure and Grey I thought was 12v. Seems the gauge steps down the voltage to the sending unit to 5 V, so I need a 5 V source. I put a meter to the ETC and found the Blue, yellow and green wires to have 5V, now I know the Blue is used for my TPS switch so that is out, that leaves the green and yellow as a 5V source. which should I use?
Beer
Beer
Thread Starter
Drifting
Joined: Sep 2005
Posts: 1,258
Likes: 0
From: Home Southern Maine
St. Jude Donor '08
Logging using EFI Live Scan for now, I am undecided on EFI or HTP for Tuning software.
Here is the info on the sensor
Autometer Part Number 2246: Summitracing under $100, Autometer sent me the harness for nothing when I told them what I was doing. Summit has the harness too for $35.
That sender operates based on a 5v input, a chassis ground, and a
return signal based on pressure. 0.5v = 0 psi, and 4.5v = 100 psi. This
is a linear signal.
You may purchase a harness through our Service Department at
815-899-0801. The cost is $25.00.
Thank you.
Cory
Tech/Service
I hooked up the grey to 12v and saw only 1.4V (shoulda been 2.8 or so so I sent a email to tech support. Here is their reply.
James
No the wiring is not correct you should have a +5 volt power source to
the gray wire and signal and ground are right. I think the higher input
voltage is affecting the output voltage.
Auto Meter Products
413 W. Elm St.
Sycamore, IL. 60178
Here is a spreadsheet I did on Volts vs PSI:
http://www.retrorelics.net/jim/Board...terFPgauge.xls
So Tapping into the green is my solution?
Here is the info on the sensor
Autometer Part Number 2246: Summitracing under $100, Autometer sent me the harness for nothing when I told them what I was doing. Summit has the harness too for $35.
That sender operates based on a 5v input, a chassis ground, and a
return signal based on pressure. 0.5v = 0 psi, and 4.5v = 100 psi. This
is a linear signal.
You may purchase a harness through our Service Department at
815-899-0801. The cost is $25.00.
Thank you.
Cory
Tech/Service
I hooked up the grey to 12v and saw only 1.4V (shoulda been 2.8 or so so I sent a email to tech support. Here is their reply.
James
No the wiring is not correct you should have a +5 volt power source to
the gray wire and signal and ground are right. I think the higher input
voltage is affecting the output voltage.
Auto Meter Products
413 W. Elm St.
Sycamore, IL. 60178
Here is a spreadsheet I did on Volts vs PSI:
http://www.retrorelics.net/jim/Board...terFPgauge.xls
So Tapping into the green is my solution?
Last edited by Beer99C5@FastbirdPerf.com; Aug 1, 2006 at 06:57 PM.
Safety Car
Joined: Aug 2000
Posts: 4,537
Likes: 84
From: St. Joseph MO
Cruise-In III Veteran
Cruise-In IV Veteran
Without breaking out my manuals for the time being. You can goto radio shack and buy a 5vdc regultor for a couple of $ and be done, otherwise I can look for an appropriate source tomorrow night
Drifting
Joined: Oct 2003
Posts: 1,923
Likes: 5
From: San Antonio TX
for us HPT guys with EIO I think the 5volt ref on the EIO would work well. if you use an ext. 5volt ref be sure to bond the grounds on the out put.
Last edited by M_T_0; Aug 2, 2006 at 04:38 PM.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
If you have the ECS/Alkycontrol system there's a regulated 5v supplied to the MAP. Considering that... I'd assume that there's the same supply to the stock MAP as well. Not sure what the additional load would do so hopefully someone can chime in w/ some enlightenment.
I'm going to be doing this as well so if I get it done before you, I'll post some info.
Arnel
I'm going to be doing this as well so if I get it done before you, I'll post some info.
Arnel
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Thread Starter
Drifting
Joined: Sep 2005
Posts: 1,258
Likes: 0
From: Home Southern Maine
St. Jude Donor '08
I ended up doing the 5V regulator from radio shack (Thanks for the tip Joey!), was less than $2.
I have 4.97 Volts going to it now. I think because I put 12 V to it I screwed up the sensor.
Now that I have the currect 5V going to it, it was reporting .12 or so at 60PSI which is out to lunch.
Autometer told me to send it to them, they will check it, if its messed up they will replace it
I have 4.97 Volts going to it now. I think because I put 12 V to it I screwed up the sensor.
Now that I have the currect 5V going to it, it was reporting .12 or so at 60PSI which is out to lunch.
Autometer told me to send it to them, they will check it, if its messed up they will replace it
