Motronic 2.7 codes not pullable and Vescovini 142581 unplugged

You want to make sure that the push button device is actually connected to the ECU diagnostic ports/pins.

On a 2.7, the vescoviny does not need to be connected at all for the engine to run and to function correctly. It's like your appendix. You don't need it.

 

The connector in that SPC figure that seems connected to nothing is connected to the main harness (which is not shown in that SPC figure) where it gets +12V and ground and connects to the slowdown warning light in the dash (or it might connect to the Motronic 2.7 ECU that then connects to run the slowdown warning light in the dash -- I don't have a schematic for your model to check).

PS That metal jumper wire in the red/yellow connector in your photo connecting the two female pins is there to simulate the conductivity of a thermocouple and "fool" the Vescovini unit -- so some shenanigans were going on. Do you have cats still present on your car?

 

If you have real, working cats in place, IMO, you should have a working system to detect overheating cat(s). Know that this won't be cheap if you have to buy new Vescovini units and thermocouples (and find those missing harness connectors). One way to judge the "health" of the Vescovini units is to confirm/deny if the self-test always works properly (i.e., the warning lights should come "on" for a second, or two, at first key "on" and then go out). If you can find the harness connectors and plug in the Vescovini units (and leave the thermocouple jumpers in place), the self-test should work. If the self-test doesn't work (like the warning light never come "on" or it stays stuck "on") = you can be pretty sure that the corresponding Vescovini unit is bad (which is very common failure).

No, I don't think that it should have anything to do with getting the flashing light Motronic failure codes.

However, I thought on Motronic 2.7 that Ferrari had implemented sending the Vescovini "happy" (or maybe unhappy) signal to the Motronic ECUs since no one ever stopped when those warning lights came "on" and just kept driving -- but this conflicts with Mitchell's post (and I have no information otherwise). Could be that on some models (like 512TR) they do connect this Vescovini signal to the 2.7 Motronic ECUs and go into a "limp" mode (or shutdown that bank's fuel supply) if it reports unhappy, but don't connect it/use it on other models (like yours). If you can find those missing harness connectors, there may be some shenanigans going on there, too (to artificially create a "happy" signal). Of course, if the schematic shows that there is no signal connected from the Vescovini units to the 2.7 Motronic ECUs = would prove Mitchell is correct. Also, if the Vescovini units are connected to the 2.7 Motronic ECUs, but the "happy" signal is no signal, and unplugging the Vescovini unit is no signal = unplugging them would have no effect as Mitchell indicated.

 

When the Mondial was built, Ferrari only had ceramic Cats from Fiat. These were not temperature resistant. Hence the Vescovinos , which switched off the Motronic for the respective cylinder bank at relatively low temperatures. Modern metal Cats are much more temperature-resistant and do not require temperature monitoring in a vehicle such as the mondial. Vescovinos can and should therefore be removed without replacement. I did this in two Mondials without any Problems over more than ten years.

 

If the cat survives, it doesn't help much if your surrounding coachwork is on fire

What year(s) Mondial or what injection system used on these Mondial you mention? Certainly on the Bosch CIS model Mondial there is zero functional operational difference whether the Vescovini-type unit(s) is(are) plugged in or not -- but that doesn't prevent the cat from overheating if there's a problem.

 

Ts with motronic 2.5 and 2.7. If you feel better keep the Vescovinos. My mechanic removed them and I trust him.