I have a Audi 80 car with TDi engine, that has a diesel fuel consumption pwm signal from ECU. I installed factory trip computer for my car, it works, but it shows about 2 times bigger fuel consumtion. It's an expected result, as Audi has not produced trip computers for diesels, only for gas engines. Is there any way to convert pwm signal, that it is half the original one?

Is there any pwm value or frequency converters? Like PWM->DC->newPWM?

I had an idea of solution, to just filter out every other pwm pulse. Is there a simple circuit that could do such a thing?

Main problem is I dont have an osciloscope, so I have no way to know what kind of pwm signal is generated by car ECU. Also I dont have any microcontroler programmers nor knowledge how to do that.

 

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