'98 e36 m3, quoting from another forum here, but figured I'd ask you guys too...
Quote:
Originally Posted by 95325i5sp
you realize it gets 5v from the ecm then modifies it? thats how a temp sensor works, its a variable resistor that changes resistance in proporion to temp. ti recieves the 5v reference voltage from the ecm then depending what the temp is it drops the voltage a corresponding amount which the ecm interprets as temp. 3.4v sounds about normal for a temp sensor. dtheway to test it would be findwhat the resistance should be at a specific temp adn if thats good the sensor is fine, its the wiring to the pcm thats bad or has excessive resistance, you'd have to test for continuity between the connector on the sensor to the appropriate pins on the ecm connector.
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Does anybody know at what resistance the coolant temp sensor triggers the dme to turn the fan on faster?
IIRC, Normal operating temp (i.e. when the temp gauge in the cluster stays at middle~ assuming the temp sender sensor is O-K) is somewhere between 190-215.
What should resistance read on the CTS around 205?