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re: resistance of temp sensor
Believe it or not, I could not find any information in Bentley on the
specific resistance for that sensor (did I miss it, anyone?). They provide
nice charts for the FI temp sensor, but nothing for the multi-function sensor.
You would think for $100 you would get a COMPLETELY comprehensive
workshop manual; on more than this occasion Bentley has left me
Assume this. The resistance between a contact on the temperature
sensor and ground will more than likely decrease with increases in
temperature; i.e. your typical inverse relationship. Take a multimeter
and measure the resistance between all contacts on the sensor and ground
at various engine temperatures You should see less resistance at higher
engine temperatures. If the guage is dead and the resistance measured
the same at cold and hot engine temperatures, then you have your answer...
You may have to mess with the sensitivity switch on your multimeter to get
an accurate measurement of the resistance. Resistance might be above
2 kohms when the engine is cold and might be below 250 ohms when hot.
More than likely, the sender is bad; an all too common problem with Audis...