KUN26 engine light coming on

General discussion of basically anything Hilux related

Re: KUN26 engine light coming on

Postby Username_here on Fri, 15 Oct 2021 6:56 +0000

I don't do it all in one hit, I've just been somewhat counting my stops between trips and it's roughly 4. The guy at the mechanics did see some other codes he told me about which were auto transmission overheat codes. He asked if I was aware and said no. I've owned the car for 6 years and done 150,000kms without seeing a warning light but the car was originally a Coates hire vehicle so I gather was towing all sorts of hire equipment and would have overheated the trans a few times. I know this generally means bad news but I tow with it all the time and haven't had any issues which is good. Knock on wood

By the way, I've noticed I'm getting roughly 100kms extra out of a tank of fuel too so that air filter must have been hell dirty! Used to be about 560kms, got 660 this week...
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Re: KUN26 engine light coming on

Postby Rob_Wood on Sat, 16 Oct 2021 3:31 +0000

Username_here wrote:The guy at the mechanics did see some other codes he told me about which were auto transmission overheat codes. He asked if I was aware and said no. I've owned the car for 6 years and done 150,000kms ...


Just a thought here ... Auto Transmissions NEED a service every 10 thou ( usually around once a year)
Also, if you do a lot of towing, consider installing a trans'-fluid cooler.
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Re: KUN26 engine light coming on

Postby Username_here on Sat, 16 Oct 2021 5:06 +0000

Thanks Rob, yet another thing I've neglected! Yes the fluid is quite brown. Will try do this today. I wonder if these have a filter too? Looks like there's a drain bolt for easy fluid changes

Fwiw I've only been changing the oil because a good mechanic told me when I originally bought the car: just change the oil and you'll be good to go. It's a Hilux! Not realising he probably meant the atf too..
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Re: KUN26 engine light coming on

Postby Gipsy on Sat, 16 Oct 2021 8:38 +0000

Rob, not sure I'd be changing transmission fluid after 10ks, that's the best way to contaminate the fluids, the modern fluids last much more than 10ks and Toyota claims their transmission fluid is 'lifetime' but yes at 150ks it's probably time to drop the pan, change the filter and flush the whole system. Especially if the fluid is discoloured AND there's codes to suggest overheating.

Username, the 'good mechanic' was probably talking engine oil change... I do mine at 5ks and include a new filter. Atf changes are not required regularly. If the engine light goes off after 4 or 5 restarts it's probably because the fault didn't return in those on-off cycles but the code would remain in 'pending codes'. As I said before, if there's a fault, sometimes it requires a certain number of times before it sets the MIL and at that point the pending codes become a MIL.
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: KUN26 engine light coming on

Postby martynvella on Sat, 16 Oct 2021 9:42 +0000

Consider putting an inline filter in the cooler plumbing, there is no filter in the transmission just a screen. According to the penrite tech help suspended particals is the second biggest killer of transmissions after over heating tbe fluid.
I use a cooper WTF 01 transmission filter and change it every 20k.
Drop the fluid from the sump cold and get about 4 litres and replace it with new once a year just to keep it fresh.
I did flush the original fluid by doing this 3 consecutive days using full synthetic penrite fluid, gave a much smoother operation and better engine braking after the fluid change.
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Re: KUN26 engine light coming on

Postby Username_here on Sat, 16 Oct 2021 3:16 +0000

Yea just went to change the fluid and low and behold: sticker on the dipstick from Toyota says "Lifetime fluid, do not change under normal circumstances". How sweet is that :D and who am I to argue?!
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Re: KUN26 engine light coming on

Postby Rob_Wood on Sat, 16 Oct 2021 11:37 +0000

Username_here wrote:Thanks Rob, yet another thing I've neglected! Yes the fluid is quite brown. Will try do this today. I wonder if these have a filter too? Looks like there's a drain bolt for easy fluid changes

Fwiw I've only been changing the oil because a good mechanic told me when I originally bought the car: just change the oil and you'll be good to go. It's a Hilux! Not realising he probably meant the atf too..


After seeing the lifetime sticker on the dipstick, I'd still wanna check that brown is the correct colour for the fluid. 20 plus years since I had anything Auto, and the fluid was a Reddy pinky sorta colour. I've got no idea what colour this lifetime stuff might be, but I figure it don't hurt to check.
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Re: KUN26 engine light coming on

Postby martynvella on Sun, 17 Oct 2021 6:03 +0000

Any fluid will last the lifetime of the transmission.
The lifetime of the transmission ends when the fluid is no longer capable of doing the job.
Shoot the tech help people of penrite an email and ask them what they think of lifetime fluid.

It amazes me how many people on this forum change the engine oil at half the australian and a third of the NZ recomended interval but believe the dealers never change transmission fluid. IF the engone oil would last out the warranty period they would call that lifetime as well.

Back in the seventies hypoid diffs never needed oil changes but now after oil has evolved beyond all expectations the dealers recomend new oil every 40k.
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Re: KUN26 engine light coming on

Postby Gipsy on Sun, 17 Oct 2021 6:13 +0000

Yes 'lifetime' probably means your transmission will have a short lifetime. If there's history of overheating and the fluid is discoloured I'd be changing it! I use my Hilux as a tow vehicle so 5ks engine oil change is a good idea. As for diff oil, I struggle to see why we need to change it at 40ks, just seems like a scam for Toyota to empty our wallets. Especially the front diff in my case I never use 4x4!
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: KUN26 engine light coming on

Postby Username_here on Sun, 17 Oct 2021 10:06 +0000

I'm headed out to grab that fluid. Good call boys. Thanks!
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Re: KUN26 engine light coming on

Postby Rob_Wood on Sun, 17 Oct 2021 12:47 +0000

martynvella wrote:Any fluid will last the lifetime of the transmission.
The lifetime of the transmission ends when the fluid is no longer capable of doing the job.
Shoot the tech help people of penrite an email and ask them what they think of lifetime fluid.

It amazes me how many people on this forum change the engine oil at half the australian and a third of the NZ recomended interval but believe the dealers never change transmission fluid. IF the engone oil would last out the warranty period they would call that lifetime as well.

Back in the seventies hypoid diffs never needed oil changes but now after oil has evolved beyond all expectations the dealers recomend new oil every 40k.


My last Auto was a HJ with a 350 Chev on a Turbo 400. Only a little bit of lump. Didn't have it long enough to need it but being a preteen in the back seat of the family falcon pulling a caravan stuck in the middle of nowhere in the middle of the night rings a bell. Dad had the auto transmission serviced before the trip and so the auto service mob came to the party in getting us going again. Moral ... Dad always swore that an annual service was a requirement of driving an auto. As I understand it, a service includes fluid change, filter, check& adjust bands and check other stuff as well, not sure exactly what else.
Last edited by Rob_Wood on Sun, 17 Oct 2021 12:50 +0000, edited 1 time in total.
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Re: KUN26 engine light coming on

Postby Username_here on Sun, 17 Oct 2021 12:50 +0000

Well the local hardware store only had one type and it didn't mention T-iv. Will pick some up during the week

Yes, I remember changing my diff oil on the 1997 80 series and straight away regretting it because the oil coming out looked just like the oil going in
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Re: KUN26 engine light coming on

Postby Rob_Wood on Sun, 17 Oct 2021 1:07 +0000

Username_here wrote:Well the local hardware store only had one type and it didn't mention T-iv. Will pick some up during the week


Hardware stores aren't usually the place to get auto products, Supercheap Auto, Auto One, Repco, and more. There's a myriad of places to get these products. I'd strongly suggest however that you read my previous post about the family being stuck on the side of the highway, the number of Semi's flying past only inches away was no fun at all. If you're only starting out at home servicing, with what I've read in this thread, I'd STRONGLY suggest that your first auto transmission service be done by a professional auto-trans' service centre. They :
1. SHOULD know what they're doing
2. They will bring it up to scratch, from which point you may choose to do future services if you wish.
3. It'll provide you with a back stop IF something does go wrong.
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Re: KUN26 engine light coming on

Postby Gipsy on Sun, 17 Oct 2021 1:14 +0000

Rob, and more importantly... username, I once had a Mercedes 280SEL and after getting the auto transmission 'serviced' by a 'professional' even though I told him the Benz required a special fluid, he argued naa any old dexron type 3 will be fine... Next week and 400klms from nowhere the tranny, you guessed it... Crapped itself all over the road thanks to the wrong fluid and a shonky 'professional'. The lesson is... Always use the correct ATF and NEVER TRUST A PROFESSIONAL. Cost me several thousand for a rebuild and the tranny specialist tells me a commodore would have cost heaps more! So much for Mercedes being expensive to fix... This was the only time it ever let me down in 10years. :( But the next owner had a great car and paid next to nothing for it. I bet it's still running fine after another 20years! As Martyn suggests, use penrite synthetic ATF FS and refresh it every couple of years especially if there's any sign of overheating or discolouration. FS is Toyota type 1V equivalent.
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: KUN26 engine light coming on

Postby Username_here on Sun, 17 Oct 2021 2:16 +0000

Thanks Gips', yes unfortunately my experience also tells me you're most of the time far better off doing things yourself if you're confident. My repair manual has the steps and it' seems very simple. They show a 5 speed transmission with a drain plug, overflow bolt and fill bolt but mine must be the 4 speed cause only 1 bolt I assume would have to be the drain. My fluid is actually quite a bit above the "hot" marks too which is weird

I was considering going in to Toyota tomorrow but if you think the Penrite full synthetic is a better option I'll go for that. I'm just a long way from anywhere hence the hardware store today. They had the blue label Penrite
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Re: KUN26 engine light coming on

Postby Gipsy on Sun, 17 Oct 2021 2:44 +0000

Yours would be 4 speed, but check to be sure... The transmission lever should only have 3rd and drive. 5speed uses different fluid!!! As Martyn says, wait until it's cold before you drop the oil as
1 it gets very hot!
2 the crap settles in the pan so unless you are dropping the pan the drain plug should drain around 4 litres but you might get more if it's overfilled. Make sure you don't overfill. And repeat some time later to help flush out the old fluid. It must be FS for the 4 speed. It has a green lable. LV has blue green lable.
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: KUN26 engine light coming on

Postby Username_here on Sun, 17 Oct 2021 3:19 +0000

This one looks like a good guide? He replaces the filter as well https://youtu.be/WPZS7Jl4njo which looks like a pretty good idea, though is more work tha I don't really want to do but probably should.

I like the idea of those magnets Toyota place inside the pan to collect any stray filings
Last edited by Username_here on Sun, 17 Oct 2021 3:40 +0000, edited 1 time in total.
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Re: KUN26 engine light coming on

Postby martynvella on Sun, 17 Oct 2021 3:34 +0000

Check the level with the engine running or within 10 seconds of turning off or it will read too high.
You will need at least 3 four litre packs and drain and refil 3 times after a days running and cooling down over night, hopfully on the third go it will be bright clean red, or it might need a fourth go.

Did you get to the bottom of the engine light coming on?
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Re: KUN26 engine light coming on

Postby Username_here on Sun, 17 Oct 2021 3:56 +0000

Thanks Marty, great advice. I was reading that half will be locked up inside the casing but wasn't really sure what to do about it.

No I'm still waiting for my obd scanner to arrive in the mail but will surely update as soon as it gets in. Really appreciate the help so thanks guys
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Re: KUN26 engine light coming on

Postby Rob_Wood on Mon, 18 Oct 2021 1:46 +0000

Gipsy wrote:Rob, and more importantly... username, I once had a Mercedes 280SEL and after getting the auto transmission 'serviced' by a 'professional' even though I told him the Benz required a special fluid, he argued naa any old dexron type 3 will be fine... Next week and 400klms from nowhere the tranny, you guessed it... Crapped itself all over the road thanks to the wrong fluid and a shonky 'professional'. The lesson is... Always use the correct ATF and NEVER TRUST A PROFESSIONAL. Cost me several thousand for a rebuild and the tranny specialist tells me a commodore would have cost heaps more! So much for Mercedes being expensive to fix... This was the only time it ever let me down in 10years. :( But the next owner had a great car and paid next to nothing for it. I bet it's still running fine after another 20years! As Martyn suggests, use penrite synthetic ATF FS and refresh it every couple of years especially if there's any sign of overheating or discolouration. FS is Toyota type 1V equivalent.


Interesting perspective, The anacdote about the family trip was a bloke in Kirrawee, he later handed over to his son and dad swore he'd never go to that little "sh..". I do understand what you say about finding the "right" professional to go to. A friend a few years ago went to a bloke in Port Macquarie and said nothing to put her finger on, but it just didn't feel right. So she went to a bloke in Coffs Harbour who went out of his way to chase up a warranty repair and he got her business after that. As with dealing with "ANY" outsourced work you need to find someone you can trust. Not always easy, but once you find a good one you know you can go back there and lean on them when you need them.
The bloke from Kirrawee drove from there to Yass to collect the transmission, take it back to Kirrawee to fix and then drove it back to Yass to put back in the car the following morning. He must have done at least a 36 hour day just to get us rolling again. Not the kind of service I can easily knock.
The bloke from Coffs Harbour. She dropped into the Fire Shed on her way home after having just collected the vehicle from an annual service. Someone noticed fluid on the ground under her vehicle. She rang him and he sent the apprentice AND the apprentices' supervisor down to refill and check the vehicle AND offered her a free complete service at her convenience. Not the greatest beginning, but still pretty good follow up.
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