Hey everyone,
This might be a good question for Disco Mike or Savanah but I have been going through the wiring diagrams off of rave and wondering were is the tranny picking up is signals from. What I want to know is what is telling it when to shift and tourque converter lockup etc..
I know the tranny is all electronic but something must be telling the TCU what to do or when to do it.

 

The tranny ECU and the engine ECU are connected on a buss and send more data messages than a whole high school cheerleading team with texting. A fellow on the down under island once had that line with a skinned spot that would ground whenever, made all sorts of strange transmission behavior. Of course to know what the pilot in command has selected, there is the XYZ switch.

 

So, why are you asking, what is your tranny doing that makes you concerned, how many miles on it, any fault code numbers and when was the fluid last changed?

 

No problems just curious as we are looking at putting a Megasquirt standalone engine management system on our new engine and need to research what sensors are feeding signals to the ECU and TCU so that I might be able to keep the auto tranny behaving correctly. There are standalone TCU's for the ZF4 but I would like to check this route first. What my main concern is if I leave the stock sensors on the engine to tell the ECU what's happening and run the fuel and timing in standalone will this have an adverse effect.
The easiest way around it would change the tranny to a LT77 or R380 and not worry about the TCU at all. We love our Disco but do not like the fragile electronics that run it and with us days into the backcountry I don't want to be worring about a bad O2 or crank sensor stranding us there. The engines are fine if built correctly and properly maintained as with the tranny its just the electronics that worries me.

 

Carry spare CKP sensor.

See - D2 owners will like the relocated coil brackets...

 

Haha..
Already checked it out but I believe he is running a manual tranny.

 

For what it is worth, the tranny has little or no computer issues and I would be hard pressed to ad some after market set up that will involve a lot of wiring which may be a pain in the ***.

 

I know the tranny doesn't but its the engines issues I want to get around.
These trucks throw codes for almost everything and are linked always to something else the shuts down the vehicle and I can't have that while I'm out in grizzly country. We need to have the security of knowing it can be fixed easily and affordably with off the shelf parts in remote areas.

 

Yep, adding parts to the system before heading out to distant spaces might be a good reason for a SAT phone. Or multiple vehicles. Any vehicle can be brought to a halt by parts that are cheap, plentiful back home, and not thought of on any check list.

Not sure how Megasquirt would interface with the hill descent and other features.

 

Have the sat phone already, as for the hill descent and the other features I have to still figure out if they can keep working.
I don't mind and always do bring spare parts but changing them in the great wide open isn't always pleasant.