How To Test A One Wire Coolant Temp Sensor

How To Test A One Wire Coolant Temp Sensor. You can do that, but it’s not a very accurate test. Find the coolant temperature sensor and remove the connector plugs.

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As the control system receives the temperature from the cts, it may trigger the cooling fan to either shut off or turn on. Measure the resistance across the terminal pins using a digital multimeter and write this value down. Go find the t14a connector to the right of the battery.

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Do this before running the engine, it must be cold for this test. Locate the coolant temperature sensor in your vehicle by referring to the service manual.

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Fill a cup or small container with ice and water. The engine coolant temperature sensor is located on the back of the right cylinder head and is integral with the ect sensor.

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Depending on the temperature, voltage readings should be in. Get the engine surface temperature using an infrared thermometer or suitable cooking thermometer.

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If the reading is not way lower than 2000ohm, you have a broke coolant temperature sensor. The cold water will serve as a reference measurement for your sensor.

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Go find the t14a connector to the right of the battery. Start the engine form cold state.

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You should have a reading of approximately 2000 ohms. Connect the black lead of the meter to the body of the cold sensor and the red to the terminal.

How Many Wires Should Be In A Coolant Temp Sensor?

Get the engine surface temperature using an infrared thermometer or suitable cooking thermometer. While you are there, you can also do resistance test on the other side of the connector to see. To test the sensor, you can remove the electrical connector and check the resistance value of the sensor and compare it to specs.

Determine Which Are The Signal And The Ground Terminals.

Not trying to sound rude here but for reference on the 350tbi the coolant temp sensor is mounted up by the thermostat housing with a dual wire connector(which is for the pcm to read the engine temp to allow the right fuel mixture), and the temp switch is mounted between the number 1&3cyl on the drivers side head with a single wire (this runs your guage cluster) The reading should be 2000 ohm approx. Testing the ect/cht sensor resistance:

How To Test An Engine Coolant Temperature Sensor An Engine Coolant Temperature Sensor Is Usually A Variable Resistor That Changes Resistance And Thus Voltage As The Coolant Temperature Changes.

Rmistor and rtd units change in resistance when temperature is above a certain level. Connect the black lead of the digital ohm meter to a solid grounding. Measuring the resistance of the engine coolant temperature (ect) sensor.

To Do This, Use Your Multimeter To Measure The Coolant Temperature Sensor’s Resistance Value, And Then Follow That Up By Connecting Your Multimeter’s Leads On One Of The Sensors Of The Electrical Connector Terminal And Consequently The Other Lead On A Different Terminal On The Electrical Connector’s Sensor.

Many inexpensive shop manuals tell you to test an engine coolant temperature sensor using an ohmmeter. Additionally, how do you test a coolant sensor? You can do that, but it’s not a very accurate test.

Do This Before Running The Engine, It Must Be Cold For This Test.

Disconnect it and see what voltage you get there. If playback doesn't begin shortly, try. The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself.