steven91 Posted March 28, 2023 Report Share Posted March 28, 2023 Hi guys Looking some info for wiring up and fuel level sensor. Using link g4+ storm and the fuel sender make is speeding parts fuel level sensor Resistance full: 90 Ohm and Resistance empty: 0 Ohm. I have an input 5 free on the ecu and can splice into ground out. Would anyone have a diagram of where to place the resistors and what resistors are required. thanks Steven Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 28, 2023 Report Share Posted March 28, 2023 Try something like this. Make sure the 100ohm resistor is at least 1/2W, the 18K can be 1/4 or 1/2W. Quote Link to comment Share on other sites More sharing options...
steven91 Posted March 28, 2023 Author Report Share Posted March 28, 2023 Hi Adam Thanks for that diagram. Are you advising to put the 1000uF capacitor in also or try the resistors first. That would also need to be a 5v capacitor ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 28, 2023 Report Share Posted March 28, 2023 You will need the capacitor as well, the cap and 18K form what is called an R-C filter, you need this to make the signal very slow so you dont just see the fuel sloshing around on your gauge. Quote Link to comment Share on other sites More sharing options...
steven91 Posted March 31, 2023 Author Report Share Posted March 31, 2023 Hi Adam. Could you give me an idea of what settings I should be using on the link programming. Thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 1, 2023 Report Share Posted April 1, 2023 Set it up as a GP input, use a cal table with Volts Vs Percent. Start with an empty tank, enter the voltage into the 0% cell in the cal table, add 10% fuel, enter the voltage into the 10% cell, etc. DenisAlmos 1 Quote Link to comment Share on other sites More sharing options...
DerekAE86 Posted May 31, 2023 Report Share Posted May 31, 2023 Just jumping on the back of this - I'm assuming it would then be possible to get the ECU to drive an external fuel gauge from this? Wonder how well a 0-5v style digital gauge would respond to a PWM signal from the ECU. Context: The AE86 digital cluster (and probably other digi dash Toyotas of the era) use a 0-5v input for the fuel gauge. The cluster itself outputs a 5v reference and dedicated gnd for the sender unit and depending on the wiper arm position the sender unit returns an analog voltage to the cluster. The cluster itself has the damping circuit built into it that works by reading the voltage input every 4min and 15sec (255 seconds), and if the voltage has changed from the last update it will move the gauge one segment in the direction of change. So if you instantly go from full to empty the gauge wont indicate this - it will just keep ticking down 1 segment every 4min15s until it reaches empty. The problem is the sender units that are specific for the digital cluster and are no longer available to buy. You can't just connect a sender unit that was designed for a resistor style analog fuel gauge either without passing it through some kind of converter. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 31, 2023 Report Share Posted May 31, 2023 1 hour ago, DerekAE86 said: Wonder how well a 0-5v style digital gauge would respond to a PWM signal from the ECU. Having made a false TPS signal to the 4wd computer in my Stagea I would recommend using an injector drive output with a pullup wired to the 5V as I used a standard Aux which pulls up to battery voltage and so the actual output voltage would vary with battery voltage (engine not running, engine cranking, engine running). Quote Link to comment Share on other sites More sharing options...
DerekAE86 Posted May 31, 2023 Report Share Posted May 31, 2023 4 minutes ago, Vaughan said: I would recommend using an injector drive output with a pullup wired to the 5V Ah smart. I'd love to do this but I already built a converter box for myself and I don't have any free inputs/outputs on my ECU anymore. But it's nice that it'd be a viable option for others facing this situation. Quote Link to comment Share on other sites More sharing options...
DerekAE86 Posted June 1, 2023 Report Share Posted June 1, 2023 2 hours ago, Vaughan said: Having made a false TPS signal What PWM frequency did you find worked the best for this? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 1, 2023 Report Share Posted June 1, 2023 54 minutes ago, DerekAE86 said: What PWM frequency did you find worked the best for this? I didn't try different frequencies, just went to as high a frequency as possible (10kHz), same for when I was controlling an MX5 dash oil pressure gauge and MR2 dash temperature sensor. In the Stagea I did also use a low pass filter but I suspect you won't need one for your application given the internal filtering Quote Link to comment Share on other sites More sharing options...
MyStarjet Posted March 9 Report Share Posted March 9 So I have come into this issue of voltages moving around more than i would like, I am going to try the capacitor and 18kohm option what voltage would the 1000uf capacitor be 16volt or closer to 5volts.. i only got it working recently so while im back there might aswell get what is needed to make this filtering circuit..thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 9 Report Share Posted March 9 The voltage rating on a capacitor is just the max value that it should be exposed to, 25 or 35V are common. Quote Link to comment Share on other sites More sharing options...
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