I am trying to get Fuel Level to the ECU. I have a 0-90 OHM sender. I am Fuel Level sensor input set as analog 1. The fuel level cal. table shows 0-5V. I have 5V feeding one side of the fuel level sender and was going to run the other wire to analog 1, however. I has testing the sender and it produces the proper ohm range when i move the float, but when I have 5V being supplied it doesnt mater where the float is I get a constant 5V. What am I missing here
Hi,
what are ur sensor settings?
If u connect it to 5V u need to use a pulldown resistor. U can select with SW 4700 Ohm. But this is probably too high for ur 0-90Ohm range. Try it an check the readings…if they are too small u need to put a pulldown or pullup resistor with a lower value in ur wiring harness.
I think atm ur settings are at 1M pulldown thats why u see perma 5V.
If it’s a standard type resistive sender, you should wire one side/connection to sensor ground and the other side/connection to an analog in with a pull-up resistor to 5V. The pull-up resistor should be approximately the same value as the ‘mid point’ of the sender resistance however you also need to consider current draw. Basically you need to find a good trade-off between resolution and current draw, as both decrease as the pull-up resistor is increased (bad for resolution, good for current draw).
If you must keep 5V to it, then you’re just playing the game the other way with 5V to one side and analog input with a pull-down resistor to sensor ground on the other side.
I will put a pull up resistor in and let you know the results but, I’m pretty sure that will fix my issue. thank you.
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The Pull up resistor did the trick. The fuel gauge now works
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