Engine Coolant Temperature Sensor

Engine Coolant Temperature (ECT) sensor uses a 5-volt reference voltage during engine operation. To check sensor signal voltage, backprobe between signal terminal and ground with engine running. See WIRING DIAGRAMS article. To check sensor resistance, disconnected sensor connector and measure resistance between sensor terminals. For ECT sensor specifications, see ECT & IAT SENSOR SPECIFICATIONS table. For additional testing information, see TEST DA under SYSTEM TESTS in SELF-DIAGNOSTICS - VILLAGER article.

ECT & IAT SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Volts

⁽³⁾ Ohms

14 (-10)

4.4

9,200

68 (20)

3.5

2,500

122 (50)

2.2

800

194 (90)

0.90

200

⁽¹⁾	Values may differ by as much as 15 percent.

⁽²⁾	Backprobe between signal terminal and ground with engine running.

⁽³⁾	Measure resistance between sensor terminals.