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Thread: gearbox and cruise control.

  1. 9th November 2022, 06:14 AM #1
    lewy
    lewy is offline Wizard Silver Subscriber
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    gearbox and cruise control.

    Not sure if this is just mine but why if I accelerate using the cruise control the converter will never ever lockup, using the foot throttle to excelerate it works as intended but not so using the cruise. I.E drive along at 70km with cruise control engaged so the G\B would be in either 3-4th gear with converter unlocked, then accelerate to 90 kms using the cruise buttons. drop the buttons, you should be now in gear 4 with no lockup and it never will lock. simply touch the brake pedal to disengage the cruise and the converter instantly locks up. What stops the lockup, electrical somewhere.not an issue unless you are towing and expect the g\b to be locked.td5
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  2. 9th November 2022, 11:21 AM #2
    shack
    shack is offline ChatterBox Supporter
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    If you keep increasing the speed with the cruise button, it should eventually lock.

    For some reason certain revisions of the TCU run vastly different cruise settings, it's really annoying!
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  3. 9th November 2022, 05:11 PM #3
    lewy
    lewy is offline Wizard Silver Subscriber
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    I have run it for 20ks at 100ish and it never locked.isn't an issue as long as you know about it.specially if you tow a heavy van in 3rd and think it is locked.
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  4. 10th November 2022, 05:30 PM #4
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    sierrafery
    sierrafery is offline YarnMaster Silver Subscriber
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    Normally the TCU should do it's job based on it's operation mode described in the WSM:

    Increased load/reduced torque compensation
    To aid performance and driveability in the high range economy mode, the EAT ECU has three adaptive shift and lockup
    maps. These maps delay upshifts and torque converter lock-up similar to the sport mode if the inputs from the
    engine indicate:
    - A sustained high load on the engine, such as occurs when the vehicle is ascending a steep gradient or towing a
    trailer.
    - A lower than normal engine torque, such as occurs at altitude or high ambient temperatures.
    The EAT ECU monitors the engine inputs and selects the most appropriate adaptive map for the prevailing conditions.
    Discovery Td5 (2000), manual, tuned
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  5. 12th November 2022, 10:12 PM #5
    johnp38
    johnp38 is offline Master Supporter
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    @lewy - have you got a nanocom? if so (if not borrow one) you can go into the TCU and reset the adaptive learning and let it relearn again, may or may not make a difference but no harm in doing.
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