Engine Coolant Temperature (ECT) Sensor
A malfunction in ECT sensor circuit can set a related Diagnostic Trouble Code (DTC). For testing procedures, see TESTS W/CODES 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. Replace ECT sensor if resistance is not within specification. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE table.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (1)
| Temperature °F (°C) | Ohms | ||
|---|---|---|---|
| 212 (100) | 177 | ||
| 194 (90) | 241 | ||
| 176 (80) | 332 | ||
| 158 (70) | 467 | ||
| 140 (60) | 667 | ||
| 122 (50) | 973 | ||
| 113 (45) | 1188 | ||
| 104 (40) | 1459 | ||
| 95 (35) | 1802 | ||
| 86 (30) | 2238 | ||
| 77 (25) | 2796 | ||
| 68 (20) | 3520 | ||
| 59 (15) | 4450 | ||
| 50 (10) | 5670 | ||
| 41 (5) | 7280 | ||
| 32 (0) | 9420 | ||
| 23 (-5) | 12,300 | ||
| 14 (-10) | 16,180 | ||
| 5 (-15) | 21,450 | ||
| -4 (-20) | 28,680 | ||
| -22 (-30) | 52,700 | ||
| -40 (-40) | 100,700 | ||
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