Engine Coolant Temperature (ECT) Sensor
A malfunction in ECT sensor can set a related Diagnostic Trouble Code (DTC). For testing procedures 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 an ohmmeter, measure resistance of ECT sensor at specified temperatures. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE table. If resistance is not within specification, replace ECT sensor.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE(1)
| °F (°C) | 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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