Anyone have a list of cars that use 2.7 motronics

I wonder what other cars use the 2.7 motronics. I'm wondering which of these cars also use the exhaust thermocouple (I don't think most do). The thermocouple in the exhaust connects to the Cat Exhaust ECU and is a very common type of temperature sensor.

The cat ecu is an amplifier of the voltage reading coming off the thermocouple.

The cat ECU sends back data to the Motronic ECU to tell the system if the cats are too hot. Based on the service manual if the cats are approaching an overheat value the Cat ECU sends back 0v to the motronic, over 980 degrees it sends back a signal of 13v which then tells the system to cut off (shut the bank down).

I have no schematic for his black box, but I would think that when these boxes fail it is related to some of the components inside, not due to the plastic case splitting (that is a misconception). I have one that I tore the plastic cover off of. I will post some pics, that plastic casing does nothing, its just there for added rigidity of the unit.

I'm going to discuss this with some of my Electrical Engineers and see what the hell is actually inside this thing.

google AD595 and read about this chip. very interesting stuff.

some interesting things:
http://www.amazon.com/AEM-30-2204-4-Channel-Thermocouple-Amplifier/dp/B001DX58T6
http://notes-application.abcelectronique.com/013/13-15004.pdf

 

I assum Ferrari is probably just as vague about the cat ecu in these service manuals as they are in the 348 manual. perhaps another car has a better manual tat will actually tell us what is in the cat ecu box.

this is what I resolved today after thinking about it again.

the input is the thermocouple

900 degrees it flashes the slow-down light

940 it turns the slow-down light on permanantly

980 it sends 13v to the motronic ECU and this is taken by the ECU to shut the bank down.

how this accomplished I do not know...

 

http://www.spc960.com/descargas_corp/cobertura/spc960/en/Injection%20completo%20960%20V22%20ingles.pdf

 

also, for the sake of completeness... I found this too. seems to be a slightly different configuration of the motronic 2.7 but nonetheless still good reading in conjunction with the 348 service manual

Overview:
http://www.members.lycos.co.uk/maxboost/htms/Moronic27.htm

Pin layout (different than the Ferrari from my first look)
http://www.members.lycos.co.uk/maxboost/htms/Moronic27pinsanddiagrams.htm

 

also, today I bought the 55 pin ECU interconnector tool. this allows me to T intersect into the ECU cable... seems like a fun thing to have and use with a digital multimeter or an occiliscope (? spelling).

 

this thing is a solid box of hardened rubber. it is very unlikely moisture can get inside. more than likely when you disconnected/reconnected the plugs you cleaned the contact just a little bit and that solved your issue. all that is inside is a small circuit board, moisture has nothing to do with it.

 

after a lot of investigation into these ECU, I assure you it is not moisture related. This is an electronic component, ever seen a radio out in a rain forest? no problem. what I suspect might be happening is when the casing begins to split off from the silicon block, it allows the electrical components to get hotter than allowed and this makes the unit fail. all of the components are rated for 85 degrees cel. and this is why the unit is in the silicon block to resist heat... anyway, just my 2 cents. if people have had good luck applying sealant, that is the way to go then.