Best place to tap +5V in engine bay?
#2
Super Moderator
iTrader: (1)
$lacker,
Good luck finding a +5V power source in the engine bay. Have you already sifted through the wiring diagram manual? Nearly all of the FD's power circuits utilize +12V. I haven't seen anything as I perused the schematics. You may have better luck finding a sensor that uses +12V. Speaking of which, what 3-wire sensor are you attempting to use?
Cheers,
George
Good luck finding a +5V power source in the engine bay. Have you already sifted through the wiring diagram manual? Nearly all of the FD's power circuits utilize +12V. I haven't seen anything as I perused the schematics. You may have better luck finding a sensor that uses +12V. Speaking of which, what 3-wire sensor are you attempting to use?
Cheers,
George
#4
I'm looking at using an AEM 30-2131-150 oil pressure sensor in place of the stock one - I've got an Adaptronic ECU and AEM CD-7 digital dash.
If there's no engine bay 5V source I'll need to draw from the cabin, which isn't terrible, just slightly inconvenient
If there's no engine bay 5V source I'll need to draw from the cabin, which isn't terrible, just slightly inconvenient
#5
rotorhead
iTrader: (3)
A lot of the factory sensors use a 5V supply. Throttle position, water temp, and air temp are examples. Look through the pinout of the Adaptronic, find the +5V supply wire's pin, and trace it through the harness. It should branch out and go to the different sensors that use it.
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#8
RX-7 Bad Ass
iTrader: (55)
I would be hesitant to tap 5v off another circuit - as stated, most of the 5v supplies are for sensors, like the TPS or MAP sensor. If you are drawing current from that supply there is a possibility that it could reduce the input voltage on that sensor and cause a faulty reading. I may be overthinking it though .
The fuel temp sensor uses a 5v input, if you've eliminated that you could tie into that wire.
Dale
The fuel temp sensor uses a 5v input, if you've eliminated that you could tie into that wire.
Dale
#9
I would be hesitant to tap 5v off another circuit - as stated, most of the 5v supplies are for sensors, like the TPS or MAP sensor. If you are drawing current from that supply there is a possibility that it could reduce the input voltage on that sensor and cause a faulty reading. I may be overthinking it though .
The fuel temp sensor uses a 5v input, if you've eliminated that you could tie into that wire.
Dale
The fuel temp sensor uses a 5v input, if you've eliminated that you could tie into that wire.
Dale
It comes from ECU pin 3I, which is the 5V feed that is designed for that purpose.
#10
RX-7 Bad Ass
iTrader: (55)
Makes sense - I think I was over thinking it .
Sensors draw a tiny amount of amperage. If you do tap into a primary sensor (especially the MAP sensor) I would make certain that the quality of that electrical connection is top notch. If the MAP sensor loses input (due to a break in the 5v wire) that would be a real pain.
I think you're on the right track, I'm mainly commenting for anyone else reading this thread .
Dale
Sensors draw a tiny amount of amperage. If you do tap into a primary sensor (especially the MAP sensor) I would make certain that the quality of that electrical connection is top notch. If the MAP sensor loses input (due to a break in the 5v wire) that would be a real pain.
I think you're on the right track, I'm mainly commenting for anyone else reading this thread .
Dale
#12
Rotary Enthusiast
iTrader: (8)
You're over thinking it at this point, in my opinion. If you're running a new ECU designed to have a fairly massive amount of sensors compared to stock you can tap off of almost any one, just make sure its clean. ECUs tend to have only 1 or 2 pins supplying 5v and the same for sensor grounds.
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