Ryan Heagney Posted August 20, 2022 Report Share Posted August 20, 2022 Hey! I’ve managed to get these to work on the scope but just not seeing enough voltage change to see a signal in the link think? using the 8v output for signal then 120R to ground on the DI seems to hold the voltage at .80v when not rotating the wheels and .9v change when rotating with two 120R resistors in series holds 2.4 v when not rotating the wheels and 1.7v when rotating any suggestions? Maybe use a 12v input to the Sensor? Or try a different resistance to ground? GT86 wheel speed sensors on a link g4x extreme changing settings in the ecu doesn’t seem to make it work Quote Link to comment Share on other sites More sharing options...
Ryan Heagney Posted August 21, 2022 Author Report Share Posted August 21, 2022 Tried it on 12v and can get a larger voltage difference from high to low, but still nothing on the link? Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 21, 2022 Report Share Posted August 21, 2022 The scope is in AC mode so cant really see what the high and low voltage is. Can you see if you can find a "coupling" setting and set it to dc. Usually under channel settings where you set v/div etc. . Quote Link to comment Share on other sites More sharing options...
Ryan Heagney Posted August 21, 2022 Author Report Share Posted August 21, 2022 Hey! sorry forgot it resets to AC every time you turn it on! this is with 12v input and 120R to ground on the signal 120R to ground 360R to ground (3x 120R in series) Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 21, 2022 Report Share Posted August 21, 2022 If im reading that scope correctly it looks to me like the waveform is switching between about 4V and 7V. For G4X it needs to fall below about 1V and rise above about 2V from memory. Quote Link to comment Share on other sites More sharing options...
Ryan Heagney Posted August 21, 2022 Author Report Share Posted August 21, 2022 Yeah so with just the 120R in there is goes down to .9v and then rises to 1.7v seems like when I increase the resistance it does make the voltage high and low wider but then doesn’t drop down Low enough to below 1v Is there a way to calculate what resistor to try? I’m thinking 120R has the voltage low enough but then doesn’t quite get high enough so maybe try 140R or 150R? Because you go to 240R the voltage doesn’t drop low enough Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 21, 2022 Report Share Posted August 21, 2022 You could possibly try something like a 500ohm potentiometer in place of the resistor so you can more easily experiment Ryan Heagney 1 Quote Link to comment Share on other sites More sharing options...
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