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  1. R

    Allison code 6600

    The TC in the allison locks in 3rd and above 100% of the time and does all shifts with TC locked. Somewhere in 2nd when downshifting it unlocks the TC. have one person report maintaining ex brake and TC lock when manually shifting down to 2nd until ~10MPH. 3-2 is a large ratio step, and the...
  2. R

    Allison PTO

    Holy @#$% !
  3. R

    Problems M1078 A0 voltage collapses

    Check your messages(letter icon top right of this page)…
  4. R

    Diagnostic Plug on a 1998 M1078

    Sort of. I have an old FL-50 ambulance at work with a cummins and a WTEC2, that has that round trans diagnostic plug… Or its a 3 with a 2 control pad:)
  5. R

    Diagnostic Plug on a 1998 M1078

    I think the drawing is a little off, which is not out of the ordinary for that manual, but I am pretty sure that is the same 6 pin Deutsch test plug that we are familiar with. The 24P identifies it as J117. 48 PAOZZ 19207 12421844 .CONNECTOR,RECEPTACL (J117)........ 1 and a...
  6. R

    Allison code 6600

    Well with Allison doc you can program different target and max RPMs, but if you have 2:1 hubs/7.8:1 axle ratio, it probably won’t shift any smoother until you put 2.5+ tons in the back… The Allison is constantly learning/refining its shifts, its base program looks at the engagement speeds and...
  7. R

    Diagnostic Plug on a 1998 M1078

    It appears to be in the 24P manual(they both are deutsch and GM connectors)… In the end they use the same 4 pins. +DC, Ground and two serial lines
  8. R

    What have you done to your FMTV or LMTV today

    Pulled my muffler for my “stack”, straight out the back:), Re-arranged my air dryer and wet tank plumbing for the hydraulic pump and habitat box install… have been thinking that some driveline hoops might keep a failed DS/U-joint from wiping out a transfer case…
  9. R

    Diagnostic Plug on a 1998 M1078

    they still call it J117, same as the old GM connector. Its on the WTEC3 interface page(shows the panel relays used in place of the VIM) in the A0 schematic…
  10. R

    Diagnostic Plug on a 1998 M1078

    That 6 pin round deutsch plug is an Allison comms option for WTEC 2 and 3, besides the GM dual inline connector the earlier A0 trucks came with… I have both the GM and a round adapter for my pro-link. Also have a FL-50 ambulance at work with a WTEC2/cummins and the 6 pin round plug…
  11. R

    Differential lock solenoid

    The center differential lock in the transfer case (goes from 70/30 AWD torque split to 50/50 4WD) is accomplished directly by the transmission when mode is selected. The TCU outputs a signal to power that second solenoid under the dash that feeds that 1/4” line to the power divider differential...
  12. R

    Differential lock solenoid

    It locks the power divider, which is basically a center differential between the axles, like the center diff in the transfer case is a differential between the front and rear axles on a 4X4(or a 6x6). Basically when not in mode if you lift any single tire, all the torque can escape thru that...
  13. R

    Problems M1078 A0 voltage collapses

    it could be a PPD issue, but I doubt it as is just a set of diodes and quite robust. The only issues I have seen with them are due to corrosion at the terminal studs as it is out in the weather. Don’t recall a diode failure. Clean all those therminals… The A0 manuals are available here on...
  14. R

    ECO Hubs Who needs 3:07 gears?

    Small boat anchors, ashtrays, the possibilities are only limited by your imagination:)
  15. R

    Problems M1078 A0 voltage collapses

    You have 3 paths to follow. Start at the batteries, follow the ground wire hand over hand to the inst shunt, then on to the front of the starter motor, then the strap over to the drivers frame. Next check the alternator ground strap, then the cab ground strap from passenger frame rail to the...
  16. R

    2008 LTMV goes into over charge dash shuts off

    Yes, you can delete the LBCD regardless of using 2 or 4 batteries. You can also simply unplug it... It does control the charge system failure light, but it only does so if it sees low voltage above a certain alternator RPM. The LBCD's main function is as a polarity protection device. its...
  17. R

    Who are the experts on the Air compressor

    I suspect you will still find leakage elsewhere. There is an output check valve on the air dryer, so once the air is pumped past that, there should be no going back to the compressor... If it is happening while driving, i would first inspect the park air lines, anti-compound valve and spring...
  18. R

    Allison code 6600

    The Allison will operate without TPS input, it falls back to its shift-point RPM table, but that can make for harsher shifting, and it looses the ability to call for a kick-down when calling for acceleration at speed… Not sure if there is a different/separate code for TPS data issues when using...
  19. R

    Allison code 6600

    I don’t see any way to get ECU TPS info from ECU to TCU except via the J1939 buss…
  20. R

    Allison code 6600

    what General said:). Probably a bad or missing buss term resistor. hard shifts are not uncommon unloaded due to the final axle gearing. Basically the mechanical advantage puts the trans clutch roll-on/roll -off PWM signaling at the end of its range. Put a ton or so in the back and it should...
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