Td5 Auto lock up and resetting adaptive values

I'm sure theres a tutorial here [somewhere] on overhauling the XYZ switch

Yeah cheers, Pedro. I'll dig it up.....but I will be doing it after the holiday season.

As it turns out, resetting the adaptive values doesn't make it go into lockup. Must have just been a coincidence the first time it happened.

Something tickles my memory that the torque converter won't lock up until a number of conditions are met. One of these is the correct engine temp.
If your nano-com suggests that the auto is seeing a low temp then that may be the reason. I have also found that oil in the engine harness sometimes causes these types of niggles.

Simon.

Thanks Simon. I will read through the nanocom documentation to determine what the Engine temp for the gearbox is actually referring to. Cheer.

Ok, have emailed black box to ask them what the engine temp in these gearbox means and have cleaned the connections going to the box.
I also upgraded the nanocom to 1.15 and scanned the engine for fault codes and it found some about temps and gearbox (24,7).

Engine temp refers to engine temp as the description would suggest. There is a correction factor that is applied in the engine module but not the autobox reading which accounts for the apparent discrepancy.

24,7 is basically logging that the gearbox has reported that it has a fault code set. You need to read the gearbox fault codes to determine what that is.

The adaptive values are are essentially compensation for wear.

Cheers
Paul

Thanks Paul. No fault logged on the box ecu. Or at least none reading with the nanocom.

So would appear that the information either being sent to or read by the box ecu regarding engine temps are incorrect.

Disconnected both batteries and the engine ECU and cleaned all connections with contact cleaner. Checked the earths which appear OK. Disconnected and cleaned both plugs connected to the box from under the car.

On connection of the ecu and batteries, checked with nanocom and no faults on the box but three faults found on the engine - 4,3 - 6,3 - and the 24,7. The first two are coolant temps (logged high, current) and the third the gearbox fault.

Reset the engine faults, exit, and come back in and only the 4,3 and 24,7 are still there.

Could this be as simple as the thermostat? It's never been changed in 223k. Can't see how, but I guess that's why I'm posting :)

Could I also rule out the XYZ switch as this probably doesn't have anything to do with the temp being read by the GB ECU?

Cheers

4-3 coolant temperature circuit (current)
6-3 coolant temperature circuit (current)
24-7 problem detected with auto gear box (current)

Check wiring to the coolant temp sensor, see if it hasn't rubbed through.
Maybe the sensor itself.
Do you get a consistent engine temp on the Nanocom?
I suggested thermostat before but you said you had done all that

I hadn't replaced the thermostat, my bad. I had cleaned the connector. And thanks for your suggestion. I'll go and check the wire to the thermostat now as I know it can rub through if not shielded properly or enough.