4 Pin Mfts

[220bhp]

Can I use a 4pin MFTS if I have the 3pin connector. The 3pin on the car has failed again its cutting the boost,I know this because it runs on full boost if I disconnect it.I have a working spare 4pin but the connector on the car has the new 3pin connector.

[dest]

What symptoms were you getting?
Mine is currently not seeing full boost too, I get 15psi (homefried) no matter what gear or revs when I floor it, so something is stopping it getting full boost

[UrS4boy]

Can I use a 4pin MFTS if I have the 3pin connector. The 3pin on the car has failed again its cutting the boost,I know this because it runs on full boost if I disconnect it.I have a working spare 4pin but the connector on the car has the new 3pin connector.

This might help:

http://www.sjmautotechnik.com/trouble_shooting/cooling.html#mfts_design

[S2central.net]

From my memory when I tested this little Motronic featurette - when that temp alarm is active on the ABY you fallback to pure mechanical boost (0.4bar / 6psi with factory WG & spring)... So you wouldn't see 15psi in that scenario.

[220bhp]

Paul, is that the case with the 3b aswell,or just the aby.

[220bhp]

Thanks for the link,urs4boy .
Dest my symptoms are boost a little low and won;t hold as well.car not as smooth or as agile. I unpluged thE MFTS,and it back to normal.

[dest]

Ok, cheers.
I unplugged mine just to rule it out and its made no difference, so atleast I know that is ok

[quattro20v]

But if the mfts is broken and gives false overheat signal and then you unplug the mfts. After that it can't give the overheat signal to ecu ---> normal pressure.

I don't think that you can use the 4-pin sensor becouse it needs 12v what the missing ping is used for.


From SMJ page:

You can temporarily run the car with the Multi-Function Temperature Sensor connector unplugged to verify if the sensor has malfunctioned and is causing the low boost problem.