Thread: 6 Speed ATF Temperature Sensor Location?

Originally Posted by DiscoJeffster

Nope. Used search for anything torque or converter. Nothing as simple as that. There are some that show numerical values of no meaning but no torque converter status (on mine at least).

I assume you’re the 6HP26 box not 28?

The last 2 vehicles I've had reason to check have been the hp26 , but I have a 28 coming in next week , I'll check, but it lists it as a function for all 6 hp's on the gap product page , not for the 8 speeds though.

Originally Posted by gavinwibrow

Car has done 260K km, but box was rebuilt under warranty at 215K km/2017.

If the box was rebuilt and not just the valve body , there's a possibility some fine clutch material could be blocking the cooler matrix.
I guess you could have also been punching in to a head wind at the time without locked coverter.

Is this such an issue as the ECU system in the car will tell you if the ECUs think the oil is getting too hot? Doesn't the system shut the car down with a display on the dash if things get too hot. It has safety margins built in.

Garry

Originally Posted by 101RRS

Is this such an issue as the ECU system in the car will tell you if the ECUs think the oil is getting too hot? Doesn't the system shut the car down with a display on the dash if things get too hot. It has safety margins built in.

Garry

It is good the ECU does adopt a cooling strategy when the transmission gets hot and for rare instances would be adequate, but it kicks in at a pretty high temperature in my opinion. Looks to be more about preventing a catastrophic failure rather than being good for long life (what ever that means for LR).

Originally Posted by discorevy

If the box was rebuilt and not just the valve body , there's a possibility some fine clutch material could be blocking the cooler matrix.
I guess you could have also been punching in to a head wind at the time without locked coverter.

1 - Don't forget 215K km / 2017 transmission rebuild, then double ATF change at 232K km/June 19, and then a single change at 253K km / Oct 19. That many changes should provide pretty fair flushing surely? Then again we are talking LR

2 - Nope - pretty flat on from Perth via Indian Ocean Drive and then on to Geraldton and Kalbarri, (Geraldton to Northampton area hilly for 60 km then flattening out again). No wind to speak of. Hence my concern that something may have changed since the Qld/NT trip last year?

Originally Posted by 101RRS

Is this such an issue as the ECU system in the car will tell you if the ECUs think the oil is getting too hot? Doesn't the system shut the car down with a display on the dash if things get too hot. It has safety margins built in.

Garry

Partially correct - I did get one gearbox warning which I think drops the trans into 4th/5th as the revs go up. Stopped car, turn off ignition, restart, all good. I did note that before I stopped, the revs would drop to idle on a trailing throttle at speed on a downhill slope.

I had a couple of similar earlier warnings on the Qld trip whilst leaving the car in cruise up slight inclines - yes I should have known better, but did some long slow days on pretty flat ground out west. I reported them on here at the time, but got very little if any response as I recall.

Originally Posted by DiscoDB

It is good the ECU does adopt a cooling strategy when the transmission gets hot and for rare instances would be adequate, but it kicks in at a pretty high temperature in my opinion. Looks to be more about preventing a catastrophic failure rather than being good for long life (what ever that means for LR).

Not consistent with my car as subsequently described above/below depending on how you set up chronologically.

No response until about 140C (according to GAP Tool) at which point I'm getting concerned), then drops to lower gear/higher revs with then a yellow triangle warning, requiring ignition off/restart - which in turn provides an interim cooling off.

Originally Posted by gavinwibrow

Not consistent with my car as subsequently described above/below depending on how you set up chronologically.

No response until about 140C (according to GAP Tool) at which point I'm getting concerned), then drops to lower gear/higher revs with then a yellow triangle warning, requiring ignition off/restart - which in turn provides an interim cooling off.

That is interesting. The above extract was the training material from 2004 prior to release, so maybe they revised the software to allow for even higher running temps. Which would be a worry but not surprising when at the time LR also considered it was OK to never need to change the transmission fluid either.

Even the engine runs warmer than I would like, and I would hate to think what EGT the TDV6 generates under high load.

Should be easy to fit an external transmission cooler - it was a common kit for the Falcon’s and the piping changes to 1/2 inch hose just before the radiator. I know most don’t think this is required with the D3/4 but if I was doing a lot of towing I would want to keep oil temps below 100 degC.