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Thread: How about working of Automatic Transmission after removal of ECU

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    Question How about working of Automatic Transmission after removal of ECU

    HI. I am modifying swift 89 (khyber shape) and installed automatic transmission of cultus which was already available. All mechanical work is complete and is in working condition. At present car is in running condition but gear does not shift automatically. Although original complete wiring, ECU and sensors are available but I want to let this transmission work without ECU like older transmissions in which gears were shift according to pressure of ATF.

    Is it possible?

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    Pressure of ATF ? can u elaborate please ?

    Is there a torque converter or is it CVT ?
    All life is an experiment. The more experiments you make the better.

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    ATF = Automatic Transmission Fluid. And Since it is Automatic transmission and not Continuously Variable Transmission therefore there must be torque converter inside it. I have used this transmission in suzuki cultus earlier along with ECU. Now it is being installed in Khyber. everything is available except Throttle position sensor which is the main cause to think about converting its nature from Electronically controlled (without electric sensors and switches) to conversion of torque by manually like Auto transmissions in early days.

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    Quote Originally Posted by asix View Post
    ATF = Automatic Transmission Fluid. And Since it is Automatic transmission and not Continuously Variable Transmission therefore there must be torque converter inside it. I have used this transmission in suzuki cultus earlier along with ECU. Now it is being installed in Khyber. everything is available except Throttle position sensor which is the main cause to think about converting its nature from Electronically controlled (without electric sensors and switches) to conversion of torque by manually like Auto transmissions in early days.
    I dont think the old carby car had ECU I had 1976 Accord with auto.

    I think it works with transmission kick down cable.
    All life is an experiment. The more experiments you make the better.

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    Quote Originally Posted by asix View Post
    ATF = Automatic Transmission Fluid. And Since it is Automatic transmission and not Continuously Variable Transmission therefore there must be torque converter inside it. I have used this transmission in suzuki cultus earlier along with ECU. Now it is being installed in Khyber. everything is available except Throttle position sensor which is the main cause to think about converting its nature from Electronically controlled (without electric sensors and switches) to conversion of torque by manually like Auto transmissions in early days.
    That is not possible / not even remotely economical

    Better to get its ecu connected and make it work as it should..

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    the electric shift transmission has electric solenoids in the valvebody to open oil ways to apply the required clutches, it also has no speed governor, exactly how are you planning to make this work? Are you casting your own custom valve body and rigging a governor?

    Why not wire the transmission up like its supposed to be wired up.

    I believe its the same old Aisin trans that was also used in the G100 charades - and it required a TCU even with carburettor engine, it would read the speedo sensor in the dash, engine coolant temperature sensor, throttle position sensor, engine rpm and gear selector lever position to activate the shift solenoids. The so called kickdown cable was there to tune the shift aggression not timing.

    It was a pretty basic system - not too bad to wire up unless the TCU was "smoked" - usually caused by A/C mechanics fiddling with it with test lamps thinking it was part of the A/C.
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    After a lot of research, it is now clear that it will not work without wiring and ECU. I have all its accessories but throttle sensor was not available as it was of cultus and I am installing it in Khyber. So got throttle sensor and just got it fit with minor modification. Now will try that after having body work after two days. Need prayers...

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    Quote Originally Posted by Xulfiqar View Post
    the electric shift transmission has electric solenoids in the valvebody to open oil ways to apply the required clutches, it also has no speed governor, exactly how are you planning to make this work? Are you casting your own custom valve body and rigging a governor?

    Why not wire the transmission up like its supposed to be wired up.

    I believe its the same old Aisin trans that was also used in the G100 charades - and it required a TCU even with carburettor engine, it would read the speedo sensor in the dash, engine coolant temperature sensor, throttle position sensor, engine rpm and gear selector lever position to activate the shift solenoids. The so called kickdown cable was there to tune the shift aggression not timing.

    It was a pretty basic system - not too bad to wire up unless the TCU was "smoked" - usually caused by A/C mechanics fiddling with it with test lamps thinking it was part of the A/C.

    Sir g it is with ECU. I was having problem regarding throttle position sensor. Now got it and that is installed with minor modification. Since car is being painted so will have road test after two days. Lets see will it work or not

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    Quote Originally Posted by bradpit View Post
    I dont think the old carby car had ECU I had 1976 Accord with auto.

    I think it works with transmission kick down cable.

    But it is not so old and there are all sensors, switches and ecu with it. Only problem is with throttle sensor. Unable to find with fits with khyber carburetor.

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