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Mack vision egt senor not working.

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Good day. Got a 2005 mack vision equipped with the aset engine. Got a 3-1 code for exhaust temp senor. At engine start up the gauge cycles with the rest of the gauges but does not move after that. I replaced the sensor, still does not work. Followed wires back into cab to the connector behind the radio, unplugged harness there and checked voltages. I am getting 1.8 volts on both pins. Anyone know what I should be seeing here for voltage? Also tested new and old sensors on the bench with heat gun and ohm meter and both seem to be operating the same. Any help would be appreciated.

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