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Hi!,
I'm a new member! One of your members has been highly recommended to me for his knowledge and expertise.... that was "Bushwacker", so I'm hoping that he, too, will be able to offer his help to me? This is the problem, then :-
I have changed the throttle position sensor (TPS) on my 1991 Mercedes 190 to a type that gives a varying voltage output that is related to the throttle position. This was necessary because the car also runs on L.P.G. and the gas E.C.U. required such an input. The TPS that was replaced had simply provided a signal to the car's petrol E.C.U. to indicate the the throttle was fully closed, and another signal to indicate that the throttle was wide-open (W.O.T.). I have now lost those signals and the car would not run correctly when using petrol. So, I need to fabricate some electronics that will re-establish those signals to the car's E.C.U. The latest TPS fitted gives an output of 4.45 volts at W.O.T. and an output of 1.18 volts when the throttle is fully closed. So, what I need is a circuit / device that will transmit a 12 volt signal when 4.45 volts is detected and again a further independant 12 volt signal when the voltage from the TPS drops below, say, 1.2 volts. It would obviously be preferable if there was provision to fine-trim these two voltages to exactly correspond to throttle wide-open and fully closed. I have tried so hard to get to the bottom of this, and have posted on another electronics forum... but nobody has even read that posting, let alone replied to it! My car is at present unuseable, so any help would be so appreciated! Thanks a lot!.... David
t
I'm a new member! One of your members has been highly recommended to me for his knowledge and expertise.... that was "Bushwacker", so I'm hoping that he, too, will be able to offer his help to me? This is the problem, then :-
I have changed the throttle position sensor (TPS) on my 1991 Mercedes 190 to a type that gives a varying voltage output that is related to the throttle position. This was necessary because the car also runs on L.P.G. and the gas E.C.U. required such an input. The TPS that was replaced had simply provided a signal to the car's petrol E.C.U. to indicate the the throttle was fully closed, and another signal to indicate that the throttle was wide-open (W.O.T.). I have now lost those signals and the car would not run correctly when using petrol. So, I need to fabricate some electronics that will re-establish those signals to the car's E.C.U. The latest TPS fitted gives an output of 4.45 volts at W.O.T. and an output of 1.18 volts when the throttle is fully closed. So, what I need is a circuit / device that will transmit a 12 volt signal when 4.45 volts is detected and again a further independant 12 volt signal when the voltage from the TPS drops below, say, 1.2 volts. It would obviously be preferable if there was provision to fine-trim these two voltages to exactly correspond to throttle wide-open and fully closed. I have tried so hard to get to the bottom of this, and have posted on another electronics forum... but nobody has even read that posting, let alone replied to it! My car is at present unuseable, so any help would be so appreciated! Thanks a lot!.... David
t
but what I actually said at that time was, "I don't know how to make the item you need, it is beyond my expertise" at being asked for anyone that _might_ I remembered how fantastic bushwackers technical knowlage was on all things surf and suggested the gentleman in question try asking your good self.
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