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Thread: Corolla se saloon automatic transmission problem

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    Default Corolla se saloon automatic transmission problem

    From last few days I am experiencing problem of reverse in my corolla se saloon automatic transmission. The reverse gear sometime don't work at all. If I switch off the car and start it again it starts to work satisfactory. If the reverse is not working their is some Anamolly in forward shifting too e.g the pick is not good and gear goes one down un necessarily. I have changed the transmission oil and cleaned its filter too, after this problem.
    The car is cng/petrol. This problem is not permanent, some it is and some time absolutely normal.
    Can any body share his expertise.


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    does it also fail to engage forward 1st gear when cold?

    what ATF did you use and was this transmission ever serviced?
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    Dear thanks for the reply, i also tried to send my problem thru message but your inbox is full.
    There is no problem in forward gear except some time it goes one gear down which i feel is un necessary.
    I have used toyota recommended ATF IV transnission oil. The transmission is not serviced

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    is the ATF full? usually such case is hardening of the O rings in the clutch packs. But low ATF also can cause this.
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    Yes the ATF is full and changed three days ago and filter cleaned also

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    this cannot be diagnosed correctly without proper pressure tests, go to a good dealership / showroom and ask if they can perform pressure tests on the transmission. If they can then ask for reports.

    The engagement of reverse is not electric. its purely mechanical.
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    Today I called three Toyota service centres , nobody has the the facility of pressure testing

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    that is a tub of poo poo. Every Toyota service centre in Pakistan has those tools, I used to get called for these services and it was very laughable when the head mechanic would tell me

    aisa meter set andar rakha hai - magar kissi ko nahi pata kaise istemaal hota hai.

    trust me they have it, because IMC (Indus Motors Co) actually sold A/T cars in Pakistan and TMC (Japan) has a requirement of such SST (special service tools) to be available in workshops with the toyota brand name.

    the gauges are not anything special - just simple pressure gauges with pipes and adapters that thread into the transmission.

    however the reverse ocassionally not working and the sudden downshift at high ratio is an indication of either a worn out direct clutch or faulty line pressure regulator (thats why I said for the line test)
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    I agree with you, these tools should be available in their workshop store with layers of dust. Well I shall be in contact with my trusted mechanic next week, whatever is diagnosed I shall be sharing with you. BTW one more pakwheeler also said that problem may be due to worn out clutch.

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    Quote Originally Posted by flarik View Post
    I agree with you, these tools should be available in their workshop store with layers of dust. Well I shall be in contact with my trusted mechanic next week, whatever is diagnosed I shall be sharing with you. BTW one more pakwheeler also said that problem may be due to worn out clutch.
    Brother there are 4 separate clutches and a torque converter in SE Saloon.

    Have u consulted with Toyota Eastern motors at Rashid Minhas road ?

    Even if everything is destroyed completely it will not cost more than 40K from 3S dealership with parts and labour to rebuild transmission to factory specifications.
    All life is an experiment. The more experiments you make the better.

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    Bradpit : Dear is for every gear their is separate clutch in automatic transmission e.g D, D2, L and R

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    no its not like that, the clutch packs engage different drive ratios on the planetary sets.
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    I was suppose to handover my car to mechanic for repairs on Monday, 2nd sep. but since last three days there is no problem of not engaging reverse gear. Discussed this new development with my mechanic and he advised if it not giving problem then keep on driving.

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    happened to our car due to low ATf and due to my father's illness it wasn't taken care of and resulted in permenant damage and the gear wasnt engaging at all had to buy a qabli gear afterwards, the car is ae100 corolla with 5afe auto
    h@mI 91

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    Well when the problem started I drained old oil and filled with new one, also cleaned filter

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    Quote Originally Posted by flarik View Post
    Well when the problem started I drained old oil and filled with new one, also cleaned filter
    did u check the level of ATF at time of oil replacement/ secondly it used to happedn in cold weather? i mean at morning or evening?
    h@mI 91

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    Gear Shift Lever ka problem hai, jab reverse gear na kam kry to engine off na krna or gear shift lever ke position (P,R or D Position par lever ko move kro) change kro or pher chek kry. agar aisy krny sy reverse gear theak ho jata hai to Gear Shift Cable ya Gear Shift Postion Sensor ka Problem hai.
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    there is no gear shift sensor in D or R for this transmission, by default at no VSS signal the transmission is fully mechanical and waiting for the fluid relief ports in the shift gate in the valvebody to open which is done by the linkage cable from the lever. The only thing that the "NSS and shift position switch" does is to lockout the starter and provide voltage to the PRND2L indicator in the dashboard.

    btw - OP

    if your trans is now shifting correct, then great but please check ATF level when the transmission is fully hot. Do an ATF change in short interval too if this was not a full flush.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    there is no gear shift sensor in D or R for this transmission, by default at no VSS signal the transmission is fully mechanical and waiting for the fluid relief ports in the shift gate in the valvebody to open which is done by the linkage cable from the lever. The only thing that the "NSS and shift position switch" does is to lockout the starter and provide voltage to the PRND2L indicator in the dashboard.

    btw - OP

    if your trans is now shifting correct, then great but please check ATF level when the transmission is fully hot. Do an ATF change in short interval too if this was not a full flush.
    i waqnted to ask a question i got my ae100's ATF changed a day ago! it was flused by removing the pan from underneath due to a slight leak poured in 4l of toyota ATF fluid, now when i checkad the levelin the morning it was way above hot and cold levels? so i guess more oil was poured probably! is it ok for the level to be above normal?
    h@mI 91

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    Atif3carzs : i have tried it, but it doesn't work until one switch off engine and switch on again.
    Hamza91 : the level of ATF was slightly above normal mark. No it was not giving problem in only morning, even when engine was hot it gives problem.
    Xulfiqar : usually I use to change ATF after 40000km, what is recommendation after how many Kms I should change it, let me tell that it was a full flush by removing the pan and also cleaning filter.

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