Connect a fuel pressure sensor (or other pressure sensor)

T

Turbo 6

Well-Known Member
Also, I have the truck coil and need to run the yellow wire to the ecugn, where do I find the correct pin?
 
EricM

EricM

Administrator
Staff member
That pin's part# is GM 12089649, NAPA 725180, or Pico 5841PT. Many times you can find it a local auto parts store. It's also on Amazon.
 
T

Turbo 6

Well-Known Member
Can I connect it to a wire on the Casper’s harness? It’ll be a few days before I can get the connector. I can wait but figured I’d ask.
 
EricM

EricM

Administrator
Staff member
If you are using the caspers harness, then you are using all the inputs available there at the egr connector.
 
EricM

EricM

Administrator
Staff member
It depends on which logging you're using, SD card or laptop.
Laptop logging automatically will add the fuel pressure reading. Whatever you named the fuel pressure sensor in the generic sensors will show up on the list of things to log.
For SD logging, you'll have to go to the Datalogging menu/SD Card Datalogging, and pick that name on the list on the left, press the single arrow to the right to add it. It should appear on the right list. Then it will add that to the SD log.
 
G

gunslinger

Member
Any chance you have the part number for the male pin that goes to the coil adapter harness?
I'm looking to just make my own harness to run to the f/p transducer.

Thanks
 
T

Ttopo8284

Active Member
DukeGN said:
I recently hooked up the Casper's wiring harness with the sensors that came with it. First, for fuel pressure you need to use Analog 2 for Sensor 6 in Generic Sensor inputs based on the two lengths of the connectors on the harness. This is the grey wire in the Casper's harness and the EGR connector, which uses A4 in the ecu wiring harness. Analog 1, the brown wire, will go to an oil pressure sensor and is the longer part of the harness. Second, the sensors are SSI P51, which use 1V to 5V. Referencing the formula on page 241 of the TunerStudio MS Lite Reference Guide, the 0V for a fuel pressure sensor is -25.0 and the 5V is 100, according to my calculations. If you also add Sensor 7 with Analog 2 to that tracks fuel pressure by reference to kPA, the values are -172.4 at 0V and 689.5 at 5V.
Click to expand...
What settings did you use for oil pressure?
 
T

turbobuick

Well-Known Member
EricM said:
It's similar, but a 2-wire temperature sensor doesn't output a 0-5v signal on its own. You have to feed 5v into the circuit using a resistor (called a pull up resistor). The ecuGN has one input that has a built in pull up resistor for this purpose, which is CAN ADC04. To enable the pull up resistor, you have to open the lid and set a jumper. Then one wire from the temp sensor will connect to CAN ADC04 and the other wire to ground. Then you can can configure the input like a 0-5v input in the generic sensors.`
Click to expand...
How do you set it up in generic sensors? I am "Assuming" this is correct? It reads 180 at room temp
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EricM

EricM

Administrator
Staff member
Looks like you selected "Same as CLT", which will make the calibration the same as your coolant sensor. If your tranny temp sensor type is not the same as your coolant sensor, then you will need to set the transformation to linear, and create a calibration for 0 volts and 5 volts (if its a linear sensor).
 
T

turbobuick

Well-Known Member
EricM said:
Looks like you selected "Same as CLT", which will make the calibration the same as your coolant sensor. If your tranny temp sensor type is not the same as your coolant sensor, then you will need to set the transformation to linear, and create a calibration for 0 volts and 5 volts (if its a linear sensor).
Click to expand...
Sorry, I used a TX73 GM CLT sensor just like you suggested in this thread. I figured the "same as CLT" was a preset for a GM CLT sensor since MOST other systems have that option. It does NOT read what the CLT sensor reads it is stuck at 180 with that options and does not read correctly no matter which selection I make. I have no idea what the linear calibration is for a TX73 CLT sensor and can not seem to find it and was hoping you or someone can help with how to set up the calibration or figure out if there is another issue. I did change the jumper in the box to use the pull up sensor and ran one wire to #12 and the other to #4 on the pinnout.
 
EricM

EricM

Administrator
Staff member
Ok, now that I know what sensor you are using... that one is indeed "same as CLT".
You have it set up on sensor 09 as Trans Temp, I assume you set up a gauge that references sensor 09?
If so, then I would check that you have 5vdc at pin 4.
 
T

turbobuick

Well-Known Member
Thanks, I dont have 5v at the pin. I will pull the ECU and check the jumper again. I tried all the selections in the generic sensors nothing worked.
 
T

turbobuick

Well-Known Member
I do have 5v at the terminal strip #4 and the jumper is correct and it reads 180 on the dash. I do have the correct location selected on the dash i I change sstuff on Sensor 9 like going to GM Calibration the dash gauge does change too.
 
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