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Engine Coolant Temperature Sensor 200 1991

posted by  joe_1991_240 on  Wed Aug 15 13:38 CST 2018
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Using the instructions at the link you provided

https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#DiagnosingECTFailures

the temperature sensor passed all tests with both voltage and ohms. Including warm-up conditions (I watched the ohms and voltage decrease in value, within range of values at link), I also unplugged the sensor to check wiring, and that test passed.

I wonder if this indicates possibly bad cold start valve or ECU... I'll keep investigating. It still starts much easier with the cold start valve unplugged.






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