outside temperature sensor
Thread Starter
Intermediate
Joined: Nov 2008
Posts: 33
Likes: 9
From: Albertson New York
outside temperature sensor
Anybody ever had this happen?
Had a constant reading on dash of outside temperature of 53 degrees even though it was 65 plus in New York. Put in new sensor now reading is constant 58 degrees.
Nothing disconnected or moved in engine bay.
Thanks for any suggestions.
Had a constant reading on dash of outside temperature of 53 degrees even though it was 65 plus in New York. Put in new sensor now reading is constant 58 degrees.
Nothing disconnected or moved in engine bay.
Thanks for any suggestions.
Tech Contributor
Joined: Jan 2007
Posts: 19,240
Likes: 1,091
From: Dyer, IN
Check the reistance to ground at the connector itself.
Drifting
Joined: May 2000
Posts: 1,917
Likes: 3
From: Southern NH
Yes, measure the impedance from the connector to ground. One pin should be grounded (0 ohms) and the other should be almost open circuit (high ohms). It's likely that your connector is corroded and either the pins in the connector are shorted or one of them is open. If you can't fix the connector it's easy to replace.
Tech Contributor
Joined: Jan 2007
Posts: 19,240
Likes: 1,091
From: Dyer, IN
Yes, measure the impedance from the connector to ground. One pin should be grounded (0 ohms) and the other should be almost open circuit (high ohms). It's likely that your connector is corroded and either the pins in the connector are shorted or one of them is open. If you can't fix the connector it's easy to replace.
Drifting
Joined: May 2000
Posts: 1,917
Likes: 3
From: Southern NH
Uhh yes. If there's a short it will show 0 ohms. BTW, that circuit uses a varying impedance of the temperature sensor (thermistor) to determine temperature by measuring the voltage drop across the sensor compared to a reference voltage. If the impedance at the connector is shorted or opened system will detect this condition and the temperature will default to 58F.
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Le Mans Master
Joined: Feb 2006
Posts: 5,267
Likes: 40
From: Phoenix AZ
Uhh yes. If there's a short it will show 0 ohms. BTW, that circuit uses a varying impedance of the temperature sensor (thermistor) to determine temperature by measuring the voltage drop across the sensor compared to a reference voltage. If the impedance at the connector is shorted or opened system will detect this condition and the temperature will default to 58F.
Chances are the plug is corroded/rusted.
Tech Contributor
Joined: Jan 2007
Posts: 19,240
Likes: 1,091
From: Dyer, IN
Uhh yes. If there's a short it will show 0 ohms. BTW, that circuit uses a varying impedance of the temperature sensor (thermistor) to determine temperature by measuring the voltage drop across the sensor compared to a reference voltage. If the impedance at the connector is shorted or opened system will detect this condition and the temperature will default to 58F.
Tech Contributor
Joined: Oct 1999
Posts: 40,995
Likes: 9,759
From: Charlotte, NC (formerly Endicott, NY)
Quote:
Originally Posted by lucky131969
Impedance? In a DC circuit?
I think he was questioning the use of the word impedance. AC circuits have impedance which includes resistance plus the effects of reactance of capacitance and inductance to an AC current. A DC circuit only has resistance as capacitance and inductance do not react to a DC current (except on initial closing of the circuit).
Bill
Originally Posted by lucky131969
Impedance? In a DC circuit?
Uhh yes. If there's a short it will show 0 ohms. BTW, that circuit uses a varying impedance of the temperature sensor (thermistor) to determine temperature by measuring the voltage drop across the sensor compared to a reference voltage. If the impedance at the connector is shorted or opened system will detect this condition and the temperature will default to 58F.
Bill
Drifting
Joined: May 2000
Posts: 1,917
Likes: 3
From: Southern NH
