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Transmission info A750 (Auto 5 sp)

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Isthatahemi, Apr 9, 2010.

  1. Apr 9, 2010 at 9:39 PM
    #1
    Isthatahemi

    Isthatahemi [OP] Well-Known Member

    Joined:
    Apr 29, 2009
    Member:
    #16582
    Messages:
    1,156
    Gender:
    Male
    Vehicle:
    TRD OFF ROAD
    BFG AT's, Weathertechs, Hoppy's brake controller.
    I will add more if there is any interest...
    A little info on the Auto 5 speed in the Taco. Summarized,
    1. if your trans light comes on, your trans is already overheated.
    2. If your truck is shifting really rough, it is likely overheating, and trying to preserve itself
    3. If you are driving with the TC locked in 3rd, your trans and engine is hot, but still withing it's acceptable range. This is as close to a tow / haul mode as our truck will ever have. Reference fron the FSM

    • ATF temperature more than
    150
    °C (302°F) =
    • ATF temperature warning light
    remains on
    Light shuts off at......
    • ATF temperature less than
    135
    °C (275°F) *2


    • ATF temperature more than
    130​
    °C (266°F) =

    • Shift point too high •
    Shifting returns to normal if...

    ATF temperature less than
    110​
    °C (230°F)

    When the conditions (a) and (b)
    are satisfied continually
    (a) ATF temperature more
    than 130
    °C (266°F)
    (b) Engine coolant temperature
    more than 95
    °C (203°F)
    =
    • Lock-up in 3rd gear *
    1

    • ATF temperature less than
    110​
    °C (230°F) *2 and engine
    coolant temperature less than

    95
    °C (203°F)
     
  2. Apr 9, 2010 at 9:54 PM
    #2
    Isthatahemi

    Isthatahemi [OP] Well-Known Member

    Joined:
    Apr 29, 2009
    Member:
    #16582
    Messages:
    1,156
    Gender:
    Male
    Vehicle:
    TRD OFF ROAD
    BFG AT's, Weathertechs, Hoppy's brake controller.
    Occasionaly I see a post where someone thinks their trans may be slipping, if it is slipping, it will turn on the check engine light before damage occurs, (theoretically)

    MONITOR DESCRIPTION
    The ECM calculates the amount of heat absorbed by the friction material based on the difference in
    revolution (clutch slippage) between the turbine and output shaft. The ECM turns on the MIL and outputs
    this DTC when the amount of heat absorption exceeds the specified value.
    When the shift solenoid valve SLT remains on, the oil pressure goes down and the clutch engagement
    force decreases.
    NOTE: If driving continues under these conditions, the clutch will burn out and the vehicle will no longer

    be drivable.

    Notice how the truck firms up the shifts when you beat on it?




    The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation
    based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the
    duty ratio* of the SLT solenoid valve output signal to control the hydraulic line pressure coming from the

    primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
     
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