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Thread: Automatic Transmission Overdrive

  1. #1

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    Question Automatic Transmission Overdrive

    I have a 1995 Mitsubishi Mighty Max SWB 2.4L Auto. The trans won't go into overdrive what can I do to fix it cheaply I don't want to send it to a trans shop.

  2. #2




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    there is a sensor on the intake manifold near the throttle body that closes when the engine is warmed up thats bad - take the wire off the sensor and ground it to the intake on one of the lugs on the manifold under the throttle body and the O/D will work any time the button on the shifter does not lock it out.
    Pennyman1
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  3. #3

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    Ok Thank you and I will try that when it is up and running after I replace the seals and timing belts.

  4. #4

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    I found a single wire not connected to anything looks like it broke off from a something near the throttle body but it is just laying there and is that maybe the wire I need to ground to the intake?

  5. #5




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    try grounding it and see - it could be the wire for the O/D sensor.
    Pennyman1
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  6. #6

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    will do Thanks!

  7. #7

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    You wouldn't know the color of the wire do you because I found out the broken wire was the connector was still on the bottom temp sensor I believe it is the temp sensor but I could be wrong lol but the point is the wire was broke from the connector and I fixed that but no change in a/t overdrive not engaging at all

  8. #8




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    should be a black wire - to be sure, look in our manual section for your truck.
    Pennyman1
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  9. #9

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    anyone got a pic of it so I would know what i am looking for or something sorry im just really confused and there are 3 sensors. 2 on the water outlet where the thermostat sits and one on the intake under the thermostat housing. Am i close to it?

  10. #10

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    Just wanted to say I found the wire and grounded it to the intake and still no overdrive but I did find the A/T ECM and I took it out and opened it and it has hot marks and corrosion where the electronics are soldered to the board in some places so I believe the ECM is toast or half-way working. So one the hunt for a new or used one.

  11. #11




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    got to fix that first - thats the trouble with electronics, they don't work after the magic smoke escapes...
    Pennyman1
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  12. #12

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    Yea I know right hahaha

  13. #13

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    Anyone have a source for the tranny ecu?

  14. #14

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    RockAuto.com has them rebuilt. Or car-part.com or row52.com for a used one.

  15. #15

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    Will you please show some pictures???????????????????
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  16. #16

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    I looked on rockauto but have no idea what it is called.

  17. #17

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    from what I have read on A500.. you can actually you a switch to lock the converter and overdrive if you don't want to replace the control unit. This is what people do when they swap the A500 and A518 into older vehicles.

  18. #18

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    What and where is the tranny ecu?
    ~~~~~~My toys~~~~
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    1990 Mitsubishi Mighty Max (Trying to figure out no power and sputtering)
    2006 Harley Davidson Heritage Softail (Rider when it's not raining and cold)
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    1974 Honda CB350F1 (In paint for tins)
    1972 Honda CB175K6 (Just a rolling chassis, no engine)
    1972 Honda CB100K2 (Needs an engine, and rebuilding) (shhhh...if wife knew I had this, she be pizzzed)
    ~~~~~or headaches~~~~~

  19. #19

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    Quote Originally Posted by pennyman1 View Post
    there is a sensor on the intake manifold near the throttle body that closes when the engine is warmed up thats bad - take the wire off the sensor and ground it to the intake on one of the lugs on the manifold under the throttle body and the O/D will work any time the button on the shifter does not lock it out.
    Is it called a thermo switch?

  20. #20

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    Quote Originally Posted by Rperales25 View Post
    Is it called a thermo switch?
    Yes, but be sure if you are ordering a replacement unit you specify what it's for or you may end up with a temperature gauge sender unit (it happens all the time...)
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  21. #21

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    Thread needs pics.

  22. #22

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    Quote Originally Posted by geezer101 View Post
    Yes, but be sure if you are ordering a replacement unit you specify what it's for or you may end up with a temperature gauge sender unit (it happens all the time...)
    My shop ordered the temperature gauge sender unit, they got the thermo switch. twice

  23. #23

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    Wanted to follow up on this. Did this fix your issue?

  24. #24

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    Quote Originally Posted by Chargerx3 View Post
    Wanted to follow up on this. Did this fix your issue?
    Not sure if you are referring to my issue, or someone one of the other earlier posts on the thread. But yes it was resolved, but not in a way that sheds much light on the sensors question.
    After trying two different temp gauge sensors, both of which turned out ot be on/off type sensors and were giving crazy readings (back and forth between all the way cold and all the way hot), put the old sensor back in and replaced the thermostat. Temperature readings went back to normal, turns out the sensor was fine the whole time, but the thermostat was stuck open so the engine temperature never got hot enough for the gauge to show a normal reading.

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