Hilux Surf 1KZ-TE Auto Trans Oil Cooler

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PostPosted: Sat Oct 27, 2012 6:41 pm 
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Hard Yaka

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Looking at getting rid of the sh*t setup Toyota has for cooling trans oil and just wondering if anyone else on here has done the same and has any tips or info that could potentially help me out.

Rang a few radiator places and it's a lot more expensive than I thought to get the oil cooler that's blocking the water outlet taken out of the radiator. So, is the best thing to do simply look for a manual 3L diesel surf radiator and fit an external trans cooler?

Had a look on trademe and there's a load on there. What size and how many rows would I need to effectively cool the trans for both on-road and off-road driving?

Thanks in advance.


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PostPosted: Sat Oct 27, 2012 7:05 pm 
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Hard Yaka

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Location: start of northland
the silverdale radiator brass ones look alright. thicker cores, i think they are Aussie built which is why they are thicker.
they say there is manual option so make sure you ask for it.
probably cheaper than removing the cooler out of the old one.


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PostPosted: Sun Oct 28, 2012 3:42 pm 
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Hard Yaka

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Thanks, what sort of price do they go for? Are they on trademe? Could you give me a link to the ones you're talking about?

I have actually been looking for a second hand manual 3L diesel one from a wrecking Surf as all the brand new ones I've found are super expensive and apparently not that great.


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PostPosted: Sun Oct 28, 2012 5:02 pm 
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Hard Yaka

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Location: Christchurch
http://www.trademe.co.nz/motors/car-par ... 214184.htm


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PostPosted: Sun Oct 28, 2012 5:22 pm 
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Hard Yaka

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Thanks for the link will save it. Might keep looking for a 2nd hand (tested) manual radiator for now see if I can pick up something a little cheaper.


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PostPosted: Sat Dec 01, 2012 3:22 am 
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Hard Yaka

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Got my 12" oil cooler in today, in series before standard cooler, and the bloody a/t oil temp light still coming on just with normal road and motorway driving. Will sometimes go out for a bit then come back on, seems semi random. Engine temp has def dropped about 5'C since cooler install today. I am unsure if the a/t oil temp light is coming on because the oil is overheating.. Are there any other reasons this light may come on? Trans oil is still nice and red, smells good, and has been topped up to full. I don't understand how it'd still be running hot. It also never used to come on, only started happening a little while ago.. Any ideas?


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PostPosted: Sat Dec 01, 2012 3:34 am 
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Hard Yaka
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Location: Massey, Auckland
Perhaps the temp sensor is faulty.....or a wire on the sense line is chaffed and earthing out causing the light to come on?

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PostPosted: Sat Dec 01, 2012 4:56 am 
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Hard Yaka
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Location: Rolleston, Chch
kbushnz wrote:
Perhaps the temp sensor is faulty.....or a wire on the sense line is chaffed and earthing out causing the light to come on?


Beginning to think this way as well. get a rag, wipe down the wires and look for chaffing/arcing.


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PostPosted: Sat Dec 01, 2012 1:56 pm 
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Hard Yaka

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Yea I was thinking the same about the sensor, so, where abouts is the sensor for the trans oil temp? And is the chaffing (if that is what it is) likely to be around the box or could it be anywhere even up in behind the dash (please tell me no lol). Also, how do I test the sensor? If it is cheap enough I will just buy a new one and replace it to tick that off the list of possible faults/reasons.


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PostPosted: Sat Dec 01, 2012 2:09 pm 
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Hard Yaka
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Location: Massey, Auckland
Sensor is here...
Image
As for the wiring, follow it back. Chaff more likely to be under the truck.
P/N is 89429‑34010 and used in many different vehicles.

http://www.toyodiy.com/parts/xref?s=894 ... J=on&mG=on

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PostPosted: Sat Dec 01, 2012 2:23 pm 
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Hard Yaka

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Awesome thanks bud will have a geeze soon. Is it worth checking fault codes or would that give me nothing? Could it be the ecu temp sensor? Or the ecu caps? Just reading on other forums and apparently those 2 things can cause odd problems for transmissions.


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PostPosted: Sat Dec 01, 2012 3:35 pm 
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Hard Yaka

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Could this be the issue? This is the correct plug, right? I tugged quite hard on the exposed wire and it didn't budge so it's not like it's falling out - **** knows how it got like that still being in there damn tight. Also tried pushing it back in but it won't budge. Where it's positioned it's not like that exposed wire can touch anything to arch out so could it be that the wire has come out just enough to sometimes have contact and sometimes not? If it didn't (i.e. like the plug being un-plugged) does/would that cause the A/T OIL TEMP light to come ON?

Next step, how do I test the actual temp sensor? And is removing it just a case of just undoing the nut below the plug and taking it out?

EDIT: Just left it un-plugged, started it up for a little bit and no A/T OIL TEMP light, so now I'm thinking that (if this plug is the cause) it actually is overheating and then the wire loses contact which cuts the light out? I also have no idea how to fix that plug from under the truck, anyone have any ideas?


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PostPosted: Sat Dec 01, 2012 4:59 pm 
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Hard Yaka
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Location: Massey, Auckland
From what I can find out it uses resistance to trigger light.
Note: triggered at 110C
The manual states if the resistance is too high or too low it will trigger.
Image
Here is a test which I have found in several manuals online...
Image
The ECU doesn't use this to control the auto..
The ECU uses water temp to control when the OD and Torque converter lock can be applied.
Its possible the ECU board could be damaged and effecting this light..
As stated in other posts the Caps tend to pop at about the 10 year mark.

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KZJ78 Landcruiser Prado...


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PostPosted: Sun Dec 02, 2012 12:53 pm 
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Hard Yaka

Joined: Mon Oct 08, 2012 12:31 am
Posts: 389
Don't have time to read that properly this morning, in a rush, will read this arvo.

But on the way home from beach yesterday the lights started doing more crazy stuff. The A/T Oil Temp light decided to stop staying either on of off for prolonged periods of time and start flickering on and off quite quickly, the O/D Off light decided to start doing the same thing although not as much as the AT light.

So is this another problem that has arisen? Or, is it likely to be the same (or similar) fault causing the O/D light to stuff around too?

Anyone run into this before? We drive through fresh water up to about door to top of wheel arch height a few times for about 5 seconds and the rest of the water driving doesn't even come up to bottom of doors. Would the water be doing something somewhere causing these probs?

Will check back tonight after work, cheers.


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PostPosted: Sun Dec 02, 2012 1:19 pm 
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Hard Yaka
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Location: Massey, Auckland
The blinking OD light can also be the ECU sending out its error codes...
Need to do a diag on the ecu..
Download a manual for the 1KZTE its all in there how to do it..
Plenty of links in here just need to search the forum..

My next guess is the ECU is on the way out (CAPS)
Some people get strange things with lights and Auto... Some just wont start one day...

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KZJ78 Landcruiser Prado...


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