Jamiem

Thank you so much Bill. Really appreciate your help.

Changed the torque converter with a spare one and problem fixed. Suspect there is a seal/O ring inside the converter that is leaking so I will send it off to be cut open and repaired

Will pull the trans and change the converter as the valve body seals didn't change the issue.

Have swapped the tcm and trans is working again. Have sent the bricked tcm away to see if it can be saved.

Thanks Roland To confirm that comms and power etc in the vehicle are making it to the zf I plugged another trans into the loom and can read that one OK. Will pull the module from the trans over the weekend. Jamie

Hi, Thanks for the response, just checked the last 4 logs before the comms loss and trans temp wasn't above 54 degC as it has a front mount trans cooler. i did try depowered over 24 hrs and still no comms and that is when i checked batt power and key on power to trans plug. i have been looking into purchacing module 77 (jlr zf 6hp26) for pcmflash to try to recover data from another zf and load it to the bricked one but may be send it to someone to do that.

Hi. I have flashed a zf 6hp26 tcm about 30 times and now it won't communicate with pcmtec or forscan. Have checked power to trans plug from battery and key on. What is the chance that I have bricked it ?

I added 6000 rpm oss to converter lock schedule to confirm it was the one in use so the converter wouldn't lock up. I am now going to replace the o rings on the valve body as I think it is loosing oil pressure to the converter before I pull the converter.

I should mention that the trans cooler is infront of the radiator and not connected to the coolant system so it doesn't get any walm up from the coolant. I populated the converter lock schedule 1 with 4000 rpm OS's for 5th and 4500 rpm OS's for 6th but still was locking/unlocking tcc. I will change schedule 3 next then 4 to see if one is for cold tot ( I am assuming there is one for cold one for walm up and 1+2 for normal temperature plus Lhm or over temp )

have a couple data logs and tot temp probably low as log 1 is from cold start. log 2 is in drive and near the end i put it into manual mode and dose it. log 3 is just after i changed the line pressure for 5th and 6th from 9.2 to 10.5 bar. log 1 patrol from cold 24-09-2023 02-46-48 PM Log.teclog log2 patrol 24-09-2023 02-54-55 PM Log.tecloglog 3 patrol 24-09-2023 03-05-42 PM Log.teclog V3 trans and fuel mod terry patrol with trans read HACCKBA _Stock.tec

Doesn't do it cold only after like 10 minutes of walm up then dose it. I have re gapped the plugs to 0.7mm and changed the coils and found the fuel pressure regulator was only at 3.3 bar so replaced that and fuel pressure is now back to normal 4 bar (originally it appeared to be in sync with wideband swinging rich / lean but wasn't fuel) Was when I held it back in 4th that it didn't do it until shifted to 5th or 6th. Was also thinking it could be a tot walm up strategy but it continues for a 20min highway drive also.

Thanks for the reply. I had added some numbers to the 5th L and M as well as the 6th L and M columns to make it softer as it comes in. will try a more aggressive approach and report back.

HI. i have a friends Patrol with a 2006 Territory engine +turbo and zf hp26 that in 5th and 6th gear around 100kph / oss 3000rpm the tcc is locking then unlocking continuously at about 15% trans throttle. in the screen shot near spk total you can see the tcc pressure saw tooth pattern that matches the surge but the converter state doesn't show it. i have changed the converter lock schedule 1 but not sure if it is for cold tot and through to schedule 5 is hot oil? also can someone enlighten me on what the situation table (converter state w/t) dose please. thanks Jamie.