Question about Mitsubishi Expo

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Fails to shift, but intermittent. Going to pass get neutral instead of down shifting to another gear or staying in gear. Trans replaced by Certified Transmission, behavior did not change. Replaced speed senor & syncronizer, they called it, still fails. The 1st transmission lost fluid & totally failed,but unknown to me, the above behavior was going on before this happen. A low mileage transmission did not change this at all. It has got to be something external to the transmission, but I spent to much already. Your my last effort even though it runs really good & efficiently. We like it but it is untrust worthy. You got any ideas? Last failure was different. It would not go out of second gear until the car was turned off. Then dead normal operation after that. Some how it is not being told to shift in both cases?

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  • Master
  • 6,784 Answers

HI. I suspect the tcu, in this case. I will need your vehicles engine specs to confirm this. Your particular model is not clear, as well. Please post this much needed information, asap.

Thanks..

Posted on Jul 06, 2010

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  • Michael Masters
    Michael Masters Jul 06, 2010

    Additionally; Is your check engine or engine maintenance light illuminated during travel?

  • wynruf Jul 07, 2010

    It is a 1995 2.4L Expo. I am convinced the transmission is not the problem, but something external that causes it not to work. It has been scaned for error codes twice by Certified Transmission. The engine fault light is on, but it does not help them at least. However, it senses even washer level, and everything you can think of, but it can and does run fine with the fault showing. It comes and goes.

  • Michael Masters
    Michael Masters Jul 07, 2010

    I see. There are to areas i would inspect, in this case. These areas are the throttle position sensor and the TCU(Transmission Control Unit). Both components can interrupt normal shifting patterns if they are malfunctioning. The TPS is mounted just to the side of the throttle body. This should be tested first. If you TPS proves to be functional, have the mechanic replace the TCU, which is mounted under the dash near the ecm. You will find the culprit in on of the areas stated. I suspect that your transmission control unit has failed.

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