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Thursday, October 9, 2008

On Board Diagnostics via the HVAC Controls

I mentioned this in passing in an earlier post but I think I should highlight it as its fairly interesting. You can read the output values of various sensors (albeit mostly trivial ones) on the car via the readout on your air conditioning controls:
http://www.audiworld.com/tech/int6.shtml


The most useful one I see is:
51 Engine Coolant Temperature (ECT) in deg C

You can check this reading against the reading on your cluster to determine if your cluster is bad or if your car is in fact overheating.

2 comments:

Brandon said...

49C gives more accurate temp read outs and is generally more useful. 51C is a rounded value that I believe is fed to the ECU.

HealthTips said...

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