BenGirling
Hey all,

I hope this is not too silly a question.  I have just purchased a vehicle with an SQ6 ECU.  Familiarising myself with the engine bay I have found the IAT sensor seems to have been intentionally disconnected, the signal wire has been taped back.

Does the SQ6 draw temp info from any other source? In my understanding of engine management the IAT is fairly fundamental and I should reconnect but just wondering if I am missing anything as this seems to have been done intentionally.

Thanks in advance.
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littleozfella
Hi Ben,
         You would need access to the calibration dataset (Map) to be sure of what happening in the calibration.  Usually the ACT will have effect on the calibration. There is 2 air sensors, ACT (Air Charge Temperature) and AAT (Ambient Air Temperature)  AAT usually have less effect, but that also depends on if the engine is Turbo or NA and if it is functioning in large altitude/temperature changes such as a rally car or hill climb car.

Cheers.
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BenGirling

Thanks for the reply!

The engine is super-charged and this sensor is located after the intercooler and before the inlet manifolds it is marked solely as 'AT', so I am guessing it is the ACT.  I have not located another air sensor despite repeatedly looking!

Is there a chance anything untoward may happen if I do reconnect it? Am an interested to see if this will help solve the laboured cold starting I am experiencing.

I am also seeing if I can access the Map, although pushing my knowledge here!

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littleozfella
Advise to ask previous owner if possible or the person who calibrated the ecu.

Cheers
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