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Engine Coolant Temperature Sensor 200 1991

posted by  Art Benstein on  Tue Aug 14 11:00 CST 2018
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

The idea is to measure what the computer sees from the sensor. The simplest way is to turn the car off, and measure the resistance of the sensor from the computer's connector, and compare that resistance to a table with resistance values versus temperature.

A better way is to measure it with the car on, backprobing the input to the computer with a voltmeter, watching the voltage change from a high value to a low as the engine warms up, checking the operation under all temperature/vibration combinations you can create.

An introduction to this can be found in the 7/9 FAQ which applies quite well to the 240 in this instance: https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#DiagnosingECTFailures

I say it is worth the trouble to learn. Besides, it is nice and comfortable compared to attempting anything similar under the intake manifold. Many times the connection is just poor, so fooling around under the manifold could drive you batty with both good and bad results.
--
Art Benstein near Baltimore

What's the definition of a will? It's a dead giveaway.






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