Engine Coolant Temperature (ECT) Sensor
If a coolant sensor-related diagnostic trouble code is present, see TESTS W/CODES article in ENGINE PERFORMANCE. See ECT DIAGNOSTIC TROUBLE CODE DEFINITIONS
table. An out-of-calibration sensor may not set a diagnostic trouble code. To test sensor calibration, disconnect ECT sensor connector. Measure resistance between sensor terminals. Resistance should be high when engine is cold and drop as engine warms. See ECT SENSOR RESISTANCE VALUES
table.
ECT DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC |
Description |
| P0116 |
Excessive Change In Sensor Output Voltage |
| P0117 |
Circuit Low |
| P0118 |
Circuit High |
| P0125 |
Excessive Time To Closed Loop |
| P1114 |
Circuit Intermittent Low |
| P1115 |
Circuit Intermittent High |
ECT SENSOR RESISTANCE VALUES
| °F (°C) |
Ohms |
| 212 (100) |
177 |
| 194 (90) |
241 |
| 158 (70) |
467 |
| 104 (40) |
1459 |
| 68 (20) |
3520 |
| 23 (-5) |
12,300 |
| 14 (-10) |
16,180 |
| 0 (-18) |
25,000 |
| -4 (-20) |
28,680 |
| -22 (-30) |
52,700 |
| -40 (-40) |
100,700 |