Engine Coolant Temperature (ECT) Sensor

Turn ignition on. Backprobe and measure voltage between ECT sensor connector terminals No. 1 and 3. See WIRING DIAGRAMS . Compare voltage with expected value. See ECT SENSOR SPECIFICATIONS table.
To check sensor resistance, turn ignition off. Carefully remove ECT sensor. Immerse sensing portion of ECT sensor in water and heat water. Measure resistance between ECT sensor terminals No. 1 and 3 as water is heated. Compare resistance with expected values. See ECT SENSOR SPECIFICATIONS table.

ECT SENSOR SPECIFICATIONS

Temperature °F (°C)

Ohms

⁽¹⁾ Output Voltage

14 (-10)

8160-10,740

⁽²⁾

32 (0)

5180-6600

4.05

68 (20)

2270-2730

3.44

104 (40)

1059-1281

2.72

140 (60)

538-650

⁽²⁾

176 (80)

298-322

1.25

194 (90)

219-243

⁽²⁾

⁽¹⁾	Backprobe ECT connector or ECM connector during engine operation.

⁽²⁾	Value is not available from manufacturer.