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How to increase voltage?

Discussion in 'General Electronics Discussion' started by oxman504, Oct 1, 2014.

  1. oxman504

    oxman504

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    Oct 1, 2014
    I'm working on putting a Allison 6 speed in my truck and I'm trying to use the the original TPS to give the TCM a TPS signal. The problem I'm running into is the original TPS starts at .43-.45 volts DC but the TCM needs to see at least .55 volts or it will set a code. Is there a way to increase the voltage that the TCM sees but still have the same .45 volts going to the ECM? I would think that I could used a diode before the increase so the ECM won't see the higher voltage.
    Please dumb it down as much as possible.
     
  2. BobK

    BobK

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    Jan 5, 2010
    Sorry, I do not speak TLA.

    Bob
     
  3. oxman504

    oxman504

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    Oct 1, 2014
    What is TLA?
     
  4. oxman504

    oxman504

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    Oct 1, 2014
    TPS= Throttle Position Sensor
    TCM= Transmission Control Module
    ECM= Engine Control Module
     
  5. KMoffett

    KMoffett

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    Jan 21, 2009
    TLA is Three Letter Acronym. It's a slam at people that use TLA's, as if every knew what they mean.

    Ken
     
  6. oxman504

    oxman504

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    Oct 1, 2014
    Yeah I figured that already hence why I describe them. Can I I get a real answer to the original question?
     
  7. Gryd3

    Gryd3

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    Jun 25, 2014
    The .43 - .45 Volts DC is a pulsed DC is it not? Is there a problem with providing the slightly higher voltage to the ECM?

    A Diode will not usually even conduct below 0.7V, so your signal would not go through...


    I spoke too soon... and didnt think about my answer. The throttle position is variable... its the cam positioning sensors I was thinking of...
     
  8. oxman504

    oxman504

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    Oct 1, 2014
    It's not pulsed. It works off of resistance. The further you push the pedal the higher the voltage.

    I would think that if the ECM saw higher voltage it might read as a higher throttle %.
     
  9. Gryd3

    Gryd3

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    Jun 25, 2014
    Do you have any other values?
    Voltage at 0% throttle, 50% throttle, and wide-open?
     
  10. oxman504

    oxman504

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    Oct 1, 2014
    Yes it is linear. At 0% throttle it's at .43-.45 and at full throttle it's a 4.5 volts.
     
  11. Gryd3

    Gryd3

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    Jun 25, 2014
    Are there any side-affect you are trying to avoid by sending the .55V to the ECU?

    Is there a problem with sending 4.6V to the TCU?

    The only thing I can think of is an additional TPS (one for the ECU, and one for the TCU)
    or a voltage adder circuit.
    Perhaps someone else has an alternative.
     
  12. oxman504

    oxman504

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    Oct 1, 2014
    Yes there are problems with that. The Dodge Cummins Throttle Pedal or TPS has descending and ascending voltages. It is feed by two 5v wires then has two signal wires and two return wires. The ECM uses the descending and ascending voltages to check each other out.

    As a last resort I was going to use another TPS, but it's going to be challenging to make a bracket and finding a TPS with the same throw as the TPS gas pedal. The TPS is the gas pedal on a 05+ Dodge truck.
     
  13. Gryd3

    Gryd3

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    Jun 25, 2014
    Can you provide some kind of diagram of the connections required and what they do?
    Does the TCU require both sides of the TPS like the ECU does?
     
  14. oxman504

    oxman504

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    Oct 1, 2014
    I'm going to make another TPS bracket so the little crying 3 year old of a TCM will be happy. It wants its own. Thanks for you help.

    As of now I'm going to use a TPS for a 88 Chevy S10 4.3. It has a sprung arm made onto it. So that should make things a little easier.
     
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