Temperature gauge is not working

Hi,

First, it sounds like the ohms were correct at room temperature. How far did it drop? If you look at the attached pic (pic 1), it shows the range based on temperature.

If the readings seem to parallel what you found, I need you to disconnect the sensor wiring connector. There should be two wires to it, a yellow and a black.

Check the yellow wire for power with the key in the run position. You should see a 5v reference signal to the sensor.

Let me know what you find.

Joe

The 2 wire ECT on the intake is fine and working properly. It’s the one on the DS head with a single dark green wire that goes to the gauge that isn’t working.

Hi,

Okay, on the firewall under the hood is a large connector plug that sends power into the vehicle. Disconnect the battery and then disconnect that plug. Pin 35 is what covers the gauge. See if there is a corrosion issue or damage at that connector.

You mentioned the dark green wire. That is the one I am referring to. It runs to the cluster. Pic 1 below shows the wiring between the sensor and the cluster.

See pic 2 shows power from the firewall to the panel. I highlighted the green wire. See if there are any breaks at any point.

Let me know.

Joe

There are no breaks in the wire. The gauge goes to hot when I ground the connector.

Do me a favor. Disconnect the battery and check the power supply wire for continuity to ground. Also, with the battery connected, check to see if there is power at the ground wire. Something is shorting unless the gauge itself is bad.

Let me know.
Joe