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Gregconboy158

Fuel level calibration

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Hi, I'm planning on using a windows tablet as my main dash, this is getting rid of the original clocks. Do we know if possible and if so how to do so to add fuel level to the g4+ ecu? It's a Honda PnP if makes a difference. 

 

I have the ohms readings for full, half and empty. 

Please let me know if it is possible or not 

 

Thanks, 

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You will need to wire an external pull up and an RC filter to damp to signal from the fuel sloshing around.  See the bottom of this post for an example:

 

You can then set the analog input up as a GP input and use a cal table to scale it 0-100%

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This should do roughly what you want. The values wont be used for any calculation but it would be enough that you could output it on a gauge in pclink.

Obviously swap in your own values for ohm readings -> percentages. Also note that the raw value off these sensors is quite jumpy as the fuel sloshes around. I dont think there is a way to dampen them in the software but you can do it with some external electronics.

 

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16 hours ago, Gregconboy158 said:

Will the diagram on that post still be ok for mine Adam? 

Yep, the 100ohm pull up will give you roughly a 3V range so that will be good.  Make sure the resistor is at least a 1/2W size, the circuit will be pulling about a 1/4W when the level sensor is at 15ohm so would probably fiz a 1/4w resistor.

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Right had a chance to try this out, for some reason I can't get it to read though lol. I've wired as per the pictures you put on that other thread Adam and here are my settings and all it will read is 0% lol. Have i done something wrong? I'm not with the car currently but these are the values stored into the ecu. 

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You don't have to pull the sender, that just makes it easier to work out the full voltage swing to check the potential divider values are correct.

  I always calibrate with the sender in the tank.  With a partial tank of fuel I disconnect the union at the fuel rail and pump the fuel into a container until the fuel pump draws the last pure fuel.  That voltage is empty.  Then add in 5 litre increments until full, noting the voltage at each point.

HTH,

Richard.

 

 

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I got it working using ANVOLT4 on my PnP ecu. 

What I was wondering was, can I use ANTEMP instead though? I've got 3 spare ANVOLT on the expansion loom which I've currently used all of and I need another! If I had known it had so little 96-98 civic PnP instead of the 95! As that has an extra 3 ANVOLT over my one. 

 

If it isn't possible to use the ANTEMP for it, is there any way of adding more ANVOLT at all or is that just not possible? 

 

Thanks, 

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If you're not using narrow band lambda you could nick the analogue volt for that off the main ECU header plug...

The problem with temp. Inputs is they have an internal pull up resistor which is quite a high value, which will result in a low reading.  If you can work around this then yes, although the calibration will show temperature, I guess you could create a custom calibration and ignore the temperature units. Calibrate as  a percentage or maybe litres.

HTH

Richard.

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On 1/13/2019 at 10:12 PM, Richard Hill said:

If you're not using narrow band lambda you could nick the analogue volt for that off the main ECU header plug...

The problem with temp. Inputs is they have an internal pull up resistor which is quite a high value, which will result in a low reading.  If you can work around this then yes, although the calibration will show temperature, I guess you could create a custom calibration and ignore the temperature units. Calibrate as  a percentage or maybe litres.

HTH

Richard.

Thanks for your reply Richard, I think I'll leave it as ANVOLT for now. 

Do you know why when I put the readings in of 0,50,100 it autocorrects to the nearest whole number? 

Example of mine is;

0.64v - 100%

1.96v - 50%

3.64v - 0% 

 

It will change it to 

0.6v

2v

3.6v

 

Anyway on stopping it doing this? 

 

Thanks, Greg

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