Auto temps using scangauge, V8 petrol Landcruiser

Submitted: Tuesday, Jun 14, 2011 at 14:47
ThreadID: 86972 Views:6054 Replies:2 FollowUps:5
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Hi all, I thought that I would give a report on using the scangauge in my vehicle for my last trip, there will be 2 reports this one for auto temps, so details of vehicle and caravan first.
2003 Toyota Landcruiser 100 series V8 petrol 5 speed auto, 285.75.16 BFG AT tyres, has draws loaded and usual other stuff also 50 litres of water behind front seats.
Caravan, Regent Legend 19ft duel axle pop top ATM of 1960 kg I do not over load the van and believe / hope I am a little under this weight.

There has been a lot of discussion regarding towing in 5th gear in a 5 speed auto, this report is for the 5 speed auto only in my vehicle , I have read that its the high temperature that kills an auto, so I thought I would see how the temps changed when using 4th gear to the overdrive 5th gear, I checked this with the scangauge and yes the scangauge does work in a 2003 V8 petrol Landcruiser, now I am not saying the temp is the only thing that can destroy an auto but would like your feedback on what I record here.

Normal driving not towing auto temp around 90c
Towing normal roads with some small hills 90c to 95c
Towing very hilly this was up the Moonbi Range the temp went up to 115c but cooled down very quickly.
Now to the difference in temps between the 4th and 5th gears was not noticeable under normal conditions, I only let the vehicle go into 5th when the conditions are suitable to do so.

I have posted this just as info, hope it helps. Pete.
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Reply By: youngharry52 - Wednesday, Jun 15, 2011 at 10:42

Wednesday, Jun 15, 2011 at 10:42
Hi Peter,

As a matter of interest, how did you get your Scangauge to read Auto Transmission temperature? I can only get Coolant temperature with mine.


AnswerID: 457493

Follow Up By: Member - Peter S (NSW) - Wednesday, Jun 15, 2011 at 11:05

Wednesday, Jun 15, 2011 at 11:05
Hi Chris, these are the codes needed for the auto trans temp, you need to look in the instruction book on how to enter these in the scangauge hope it helps. Pete

TXD: 686AF101B4 
RXF: 044105B40000 
RXD: 2808 
MTH: 000100010000 
FollowupID: 730651

Follow Up By: youngharry52 - Thursday, Jun 16, 2011 at 08:46

Thursday, Jun 16, 2011 at 08:46
Hello again Peter,

Will those codes work on the 200 series TTDiesel? The guys on the LCOOL website have been unable to find any codes for the Auto Tranny Temp. Where did you find these if you don't mind me asking?


FollowupID: 730753

Follow Up By: Member - Peter S (NSW) - Thursday, Jun 16, 2011 at 14:29

Thursday, Jun 16, 2011 at 14:29
Hi Chris,

I am not sure if these codes work on any other than the 100 series V8 petrol cruiser, but its worth a try, I searched for the codes in the net and found that another person had already found them and he kindly posted them, where he got them I am not sure, no problem asking that's what the forum is for, exchange of info, it all helps.

FollowupID: 730787

Follow Up By: youngharry52 - Friday, Jun 17, 2011 at 08:16

Friday, Jun 17, 2011 at 08:16
Thanks Pete, I will give it a crack.


FollowupID: 730871

Follow Up By: Gone Bush (WA) - Saturday, Jun 18, 2011 at 21:33

Saturday, Jun 18, 2011 at 21:33
I just tried those codes in my 200 Series.

No success, unfortunately.

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FollowupID: 731117

Reply By: snoopyone - Friday, Jun 17, 2011 at 09:43

Friday, Jun 17, 2011 at 09:43
It is not the Auto temp you need to worry about .
I have an oil temp gauge on my auto in a 2005TD and get similar but lower results . Normal running 70-75 Highest 95 as below. Nothing to worry about.

THe discussion about towing in 5th in relation to temperature has been ENGINE temperature.

You would be better checking a point on the heads or the block.

In my TD which has a chip etc I have an EGT post turbo which in 4th at 90kph ran at 325 deg on a flat road towing 2850 kg.

Drop it into 5th and it went straight up over 400-425 deg.

Remembering that the preturbo temp is about 200deg above that you dont want to get it too high as pistons melt at a bit above 800deg.

Especially in "Grenades" LOL

The highest I have had mine was 515deg at the top of the Willunga hill on a very hot day.
Had to drop down to 2nd and back off considerably.

That is what the discussion was about and also the fact that you use more fuel when the engine is lugging as low revs, more fuel, more heat.

V8's may have different characteristics but the principle would be the same.

AnswerID: 457689

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