Engine Coolant Temperature Sensor
A malfunction in ECT sensor circuit can set a related DTC. For test procedure with DTC set, see appropriate SELF-DIAGNOSTICS article. An out-of-calibration ECT sensor may not set a DTC. Use the following procedure to test sensor calibration.
Locate and remove ECT sensor from thermostat housing. Using DVOM, measure resistance of ECT sensor at specified temperatures. See ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE table. If resistance is not within specification, replace ECT sensor.
ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE (1)
| Temperature °F (°C) | Specification (Ohms) | ||
|---|---|---|---|
| 176 (80) | 315 | ||
| 158 (70) | 435 | ||
| 140 (60) | 580 | ||
| 122 (50) | 810 | ||
| 113 (45) | 940 | ||
| 104 (40) | 1150 | ||
| 95 (35) | 1360 | ||
| 86 (30) | 1600 | ||
| 77 (25) | 2000 | ||
| 68 (20) | 2400 | ||
| 59 (15) | 3000 | ||
| 50 (10) | 3600 | ||
| 41 (5) | 4600 | ||
| 32 (0) | 5700 | ||
| 23 (-5) | 7400 | ||
| 14 (-10) | 9800 | ||
| 5 (-15) | 12,700 | ||
| -4 (-20) | 16,000 | ||
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