Testing coolant temperature gauge voltage

[horizontalkev]

When I test for voltage for the wire to the sensor, I am getting 2.3v. I know approximately 4.5v is normal, so what's it mean to have half of what's normal? Brand new battery showing 12 volts. Thanks

 

[4g63t]

That sensor is a variable thermistor. The resistance is going to change as the coolant changes temperature in which changes the voltage back to the ecu. So yeah sounds right.

 

[horizontalkev]

Im talking about testing the wires, not The sensor itself. I have a new sensor that tested good.

 

[4g63t]

Sounds like you need to test it at the ecu to see if it is sending the right voltage. Then it can only be one thing. Sorry i misread.

 

[miguelmcv]

Just disconnect the sensor connector and test for continuity from one end to the other end at the Cluster.

 

[4g63t]

Just disconnect the sensor connector and test for continuity from one end to the other end at the Cluster.

We are not discussing the single wire for the gauge cluster, nor does it contain a 5v power source.

 

[miguelmcv]

We are not discussing the single wire for the gauge cluster, nor does it contain a 5v power source.

Then I'm confused now.

Im talking about testing the wires, not The sensor itself. I have a new sensor that tested good.

Is it just the wire you are trying to test?, or the sensor?.
Sorry but the post before me just confuses me.

Can you explain a little more so He/me/we are on the same track.

 

[horizontalkev]

Sorry guys just realised the title of my thread was slightly wrong. Im talking about the wires for the coolant temperature sensor for the ecu. Checking the voltage of the wire that sees voltage. I get around 2v when it should be 4.5v I will test at ecu later tonight