Vehicles (17 Jan 2019)
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Auto gear box
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4000rpm in 3rd before changing to 4th seems high to me.
1000rpm in 3rd is approx 15mph so you must be doing 60mph.
1000rpm in 4th is approx 20mph.
Mine shifts into 4th at about 40 mph (when hot) which is about 2600rpm in 3rd.
My conclusions based on previous cars (with limited electronics) are:-
β You must be driving it very hard
β The kick down needs adjusting
β The torque converter is slipping more than it should
Does anyone know how the Jimny auto box is controlled?
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Not to be picky but this should be in the technical forum as more responses might be forthcoming.
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If it is your first automatic it could just be a case of adjusting your driving style. I dont mean that to be patronising or cheeky but driving an automatic is very different to a manual.
As Jimkyx mentioned, you could be accelerating too hard. Automatics change down gear when the accelerator is flat on the floor, kickdown.
On your Jimny, the kickdown and automatic gearbox control is all taken care of electronically. Which means, if there is a fault and it happens enough times/for long enough that particular control unit will pick up on it and store a fault code. If the fault is detected in the engine (the throttle position for example) the engine management light will show.
If there is a problem with the gearbox the 'od off' light will flash, in severe cases the automatic gearbox will only operate in 3rd gear.
In otherwords, if there was anything serious, the control unit would probably know about it before you even noticed!
From my experience with Jimnys, sticking in 3rd gear is usually the first sign of trouble with the gearbox. Automatic gearboxes are not cheap. Torque converters are not cheap. Because automatic gearboxes are usually quite reliable, mechanics rarely get the chance to work on them so arriving at your local garage asking them to do anything with an automatic gearbox is usually met with a look of terror!
There are things you, as an owner can do like check the oil (the 1st thing I look at if I have a car at work with automatic gearbox problems regardless of the symptoms.
Drive the car until the heater blows hot.
Select P, then R, then N, D, 2, L then back to N and turn the car off.
Check the oil level on the automatic gearbox, should be on the passenger side of the engine bay.
Oil level should be between the 2 dots. The oil should resemble strawberry sauce.
It sounds simple but as the automatic gearbox is just a big hydraulic pump it needs the correct amount of oil to do anything. The colour is important too. Brown means something is burnt and on its way out. Pink means water is leaking in somewhere.
Given the age and mileage of your Jimny I'd be expecting red oil above the bottom dot on the dipstick. It takes about 100ml to raise the oil level from the bottom dot to the top and that amount can make a difference!
If your problem disappears as the car heats up I'd imagine, if there is a problem it is to do with the oil level.
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IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
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The auto box oil doesnt need changed until something ridiculous like 99000 miles.
If the car had a problem at that age/mileage that made it necessary to refill the gearbox it would probably been done at the dealers.
Even if it wasnt, I'm pretty sure Dexron II or III would be ok. I've never tested it but gear oil would either work fine or render it immobile!
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Tried mine and it did delay changing into 4th.
If the oil is OK then I don't think you have a problem.
The ECU must read the rpm and engine temp stopping an early change when cold to reduce strain on the engine.
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- Posts: 232
- Thank you received: 5
- Points: 352.00
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