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Temperature Sensor Diagnostic 200 1990

posted by  oldguy on  Sun Oct 26 09:32 CST 2008
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last visit: Mon Sep 1 13:35 CST 2014
[RELATED]

After engine overheated due to hole in a radiator hose, I had an engine diagnostic for the Temperature sensor bad.

I replaced the sensor, and tested the old one, and did not see that it was bad.

After replacement the diagnostic would not reset, and still showed a bad temp. sensor.

I pulled the wire connector and put a meter across the two wire connectors. With the engine off and ignition switched on I was getting 325 millivolts. When the engine started the voltage reversed, and I was getting 4.25 volts from the ECU.

I am not sure what the bad temperature sensor is doing to my fuel economy? but want to get the engine light off?

Anyone know what the ECU does when it thinks the sensor is bad.

I could also hook up the spare temp sensor and check DC current.

Any suggestions?

Thanks - Oldguy






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