Engine Coolant Temperature Sensor

Engine Coolant Temperature (ECT) sensor uses a 5-volt reference voltage during engine operation. To check ECT signal voltage, backprobe between signal terminal and ground with engine running. To check sensor resistance, disconnect sensor and measure resistance between sensor terminals. For specifications, see ENGINE COOLANT TEMPERATURE SENSOR SPECIFICATIONS table. For additional testing information, see CIRCUIT TEST DA under CIRCUIT TESTS in appropriate G - TEST W/CODES article.

ENGINE COOLANT TEMPERATURE SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Volts

⁽³⁾ Ohms

50 (10)

3.51

58,750

68 (20)

3.07

37,300

86 (30)

2.60

24,270

104 (40)

2.13

16,150

122 (50)

1.70

10,970

140 (60)

1.33

7700

158 (70)

1.02

5370

176 (80)

0.78

3840

194 (90)

0.60

2800

212 (100)

0.46

2070

230 (110)

0.35

1550

248 (120)

0.27

1180

⁽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.