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Thread: Allison 6speed Range inhibit after DVT

  1. #11
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    Quote Originally Posted by JoshH View Post
    Well, I think there are still a few bugs in the 6 speed DVT. If you have the DVT enabled it seems to work fine. Then when you deactivate it it drops into neutral, bangs real hard, and throws up a "Shift Range Inhibited" message on the DIC.

    Also, I was at the Diesel Power Challenge with IdahoRob this week. We were using the DVT feature on EFILive to lock the converter and hold the truck in 5th gear. We started the dyno pull at around 1500 RPM. It got up to somewhere around 2500 and all of a sudden it jumped into neutral and the "Shift Range Inhibited" message popped up again.
    Do you guys have any idea about what's going on here? Is there anything I can do to help get it figured out?

  2. #12
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by JoshH View Post
    Well, I think there are still a few bugs in the 6 speed DVT. If you have the DVT enabled it seems to work fine. Then when you deactivate it it drops into neutral, bangs real hard, and throws up a "Shift Range Inhibited" message on the DIC.
    Josh, just by chance when you deactivate the bi-di controls, are any of the overrides still enabled? I'm just trying to get my head around a possible process error, in other words if you deactivate the bi-di controls before disabling the individual control this might cause a problem (it shouldn't, but who knows!). If that is actually the cause then we need to address that to happen automatically.
    Meanwhile I will endeavour to get a number of the PID's in the scantool that will help show us why the shift inhibit came up. Also, thanks for your assistance and patience on getting the DVT's working for the 6 speed. I always seems so odd that some trucks seems to play nice whilst others don't. Just out of interest, have you used a TechII for bi-di on the truck recently?

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #13
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    Quote Originally Posted by GMPX View Post
    Josh, just by chance when you deactivate the bi-di controls, are any of the overrides still enabled? I'm just trying to get my head around a possible process error, in other words if you deactivate the bi-di controls before disabling the individual control this might cause a problem (it shouldn't, but who knows!). If that is actually the cause then we need to address that to happen automatically.
    Nope, I disabled each individual control, and then disabled the whole thing (the enable/disable buttons next to the drop down menu).
    Meanwhile I will endeavour to get a number of the PID's in the scantool that will help show us why the shift inhibit came up. Also, thanks for your assistance and patience on getting the DVT's working for the 6 speed. I always seems so odd that some trucks seems to play nice whilst others don't. Just out of interest, have you used a TechII for bi-di on the truck recently?

    Cheers,
    Ross
    Nope, no Tech II hooked up to my truck for a while. I'll keep an eye on everything to see when you get a new update out. Thanks.

  4. #14
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    Hey this was happening to me too. I tried this in 4th gear with the tcc locked and just about the same rpm range it popped out into neutral with the DIC message.

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