Allison 1000/M74 P0746 Code

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  • Allison 1000/M74 P0746 Code

    Hi Everyone

    Did some troubleshooting on the P0746 code and found a wire diagram and some spec's for the solenoids.
    Checked the solenoids with a multi-meter thru the main electrical connector, my diagram showed that pins "L" & "M" are the positive and negative for the trim A solenoid from the "L" pin witch my diagram shows as trim solenoid A power i get continuity to the case of the transmission.
    Am i correct to assume this is not supposed to happen and the solenoid is shorted.

    Thanks
    Neil

  • #2
    neil, hope fully the DMAXDR will chime in. You can PM him as well

    Comment


    • #3
      Originally posted by neil504 View Post
      Hi Everyone

      Did some troubleshooting on the P0746 code and found a wire diagram and some spec's for the solenoids.
      Checked the solenoids with a multi-meter thru the main electrical connector, my diagram showed that pins "L" & "M" are the positive and negative for the trim A solenoid from the "L" pin witch my diagram shows as trim solenoid A power i get continuity to the case of the transmission.
      Am i correct to assume this is not supposed to happen and the solenoid is shorted.

      Thanks
      Neil
      Just saw your post I'll look into what you've got going on when I get in to the shop on the morning and get back to you ASAP.
      2006 LBZ Daily Driver, Tractor, School Bus, Hot Rod Diesel , Crew Cab, Lifted, Hunting Rig , Cowboy Cadillac

      Comment


      • #4
        What year is your DMAX and what upgrades have been done. The trans code that you have is a code that will set if there is a oncoming clutch apply that is slipping , a flare or did not apply, it is possible to have a trim solenoid that is stuck slow to apply or nonoperational. An open of shorted trim solenoid would set a P0748.
        Last edited by DMAXDR; 12-02-2015, 10:34 AM.
        2006 LBZ Daily Driver, Tractor, School Bus, Hot Rod Diesel , Crew Cab, Lifted, Hunting Rig , Cowboy Cadillac

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