Prado S mode

Submitted: Tuesday, Oct 03, 2017 at 20:07
ThreadID: 135696 Views:2544 Replies:2 FollowUps:11
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I'm sure this is a dead simple question to answer but ...
The car is a 2013 SWB Prado auto - 5 speed. I read that when towing I should use S4 rather than Drive. Here's the question(s) I can't find an answer to ...
When do I change into S4? From start-up or when I'm up to speed?
When I'm in S4 does the transmission still behave as an auto box and change up and down but just not go beyond 4th?
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Suitcase
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Reply By: Gronk - Tuesday, Oct 03, 2017 at 20:53

Tuesday, Oct 03, 2017 at 20:53
You can change into S4 whenever you like, but easier to remember to do it if done at startup.
It will still behave like an auto, but won't go above 4th.
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Follow Up By: Member - RUK42 (QLD) - Tuesday, Oct 03, 2017 at 20:58

Tuesday, Oct 03, 2017 at 20:58
Thanks Gronk
Just what I wanted to hear.
Cheers
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Follow Up By: Member - Wildmax - Tuesday, Oct 03, 2017 at 22:22

Tuesday, Oct 03, 2017 at 22:22
Good question :-) I'm about to start driving an auto after having towed with a manual for years.
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Follow Up By: Member - David M (SA) - Tuesday, Oct 03, 2017 at 22:29

Tuesday, Oct 03, 2017 at 22:29
Just remember Wildmax that R is for reverse and not race.
Dave.
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Follow Up By: Life Member - Rob 49 - Wednesday, Oct 04, 2017 at 08:17

Wednesday, Oct 04, 2017 at 08:17
Also remember P is for Park and not for Pass

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Follow Up By: Member - Wildmax - Wednesday, Oct 04, 2017 at 10:06

Wednesday, Oct 04, 2017 at 10:06
But what if you want to race in reverse?!
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Follow Up By: tazbaz - Thursday, Oct 05, 2017 at 12:00

Thursday, Oct 05, 2017 at 12:00
And D is for drive, not drag
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Reply By: Athol W1 - Wednesday, Oct 04, 2017 at 09:01

Wednesday, Oct 04, 2017 at 09:01
IN the case of the Toyota products the S mode normally operates as a full auto up to the gear selected, this is not the case with ALL auto's.
In the case of the Isuzu the S mode will not change up automatically but will change down automatically, and always starts from 1st from rest requiring the driver's input to attain any up shift.
Both these vehicles are using Aisin transmissions, and in the case of the Prado and Dmax even the same basic 5 speed transmission, so the mode of operation comes down to the personal preference of the chief engineer of the respective vehicle manufacturer.

Just try yours if in doubt. These electronically controlled transmissions will not allow any operation which is outside their design parameters (ie they will not allow any downshift that is attempted when the road speed is too high
Regards
Athol
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Follow Up By: Member - RUK42 (QLD) - Wednesday, Oct 04, 2017 at 09:35

Wednesday, Oct 04, 2017 at 09:35
Thanks Athol
Will have to try it out soon - just wasn't sure what I should try - I'm a bit like Wildmax - only driven manuals for umpteen years.
cheers
Kevin
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Follow Up By: Athol W1 - Wednesday, Oct 04, 2017 at 10:25

Wednesday, Oct 04, 2017 at 10:25
RUK42
As you have indicated that this is your first auto, and it being a Prado, may I suggest that you look very closely at fitting an additional transmission cooler, and especially if your vehicle is a diesel (Prado diesels normally only have the oil to water cooler in the radiator whereas their petrol versions have both oil to water and oil to air coolers).

I would also suggest that the fitting of a Scangauge 2 (or similar) would be beneficial so that you can keep a check on the transmission temp, and drive (select the appropriate gear) to minimise the trans temps. By selecting the gear that will allow continued operation with the convertor clutch in 'lock up' mode then this will minimise the trans temps, and for every 10 degrees that you can reduce the trans temp you double its life. The main reason for Toyota recommending that you tow in S4 is to maintain the convertor in lock up mode thereby reducing trans temps.

Enjoy your drive with an auto, you will not go back to the old stick shift (been there, done that about 15 years ago).

Regards
Athol
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Follow Up By: RMD - Wednesday, Oct 04, 2017 at 10:36

Wednesday, Oct 04, 2017 at 10:36
Not sure about doubling the life with each 10C cooler running, sounds a bit far fetched, but the reduced temp will reduce the risk of premature failure and control overheating by the use of the cooler. They all wear out no matter how cool they run.

Running it 50 C cooler can't make the auto last to 2,500,000km instead of 500,000km
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Follow Up By: Member - RUK42 (QLD) - Wednesday, Oct 04, 2017 at 11:27

Wednesday, Oct 04, 2017 at 11:27
Where/How do people mount the Scangauge2? Will it fit with a bit of double sided tape on the steering column?
Any particular brand of transmission cooler?
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Follow Up By: Athol W1 - Wednesday, Oct 04, 2017 at 11:46

Wednesday, Oct 04, 2017 at 11:46
The Scangauge 2 comes with some stick on velcro tape, and it is a matter of preference as to where yo fit it.You simply plug it into the OBD11 port which should be under the dash and then go through the fairly simple basic programming. You do need to programme in the codes for the transmission temp.

I would go to Repco or similar and purchase the largest cooler that they have with the 10mm or 3/8" outlets, and I would also purchase an extra 1 metre of hose. Whilst there are arguments as to which side of the radiator cooler it should be fitted either side will remove sufficient heat load from the system to have a marked effect on the operation of the entire cooling system when put to the test.

Regards
Athol
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