Coolant Temperature Sensor
- Disconnect coolant temperature sensor. Using a DVOM, check the sensor resistance. Resistance should be as specified in the COOLANT TEMP SENSOR & MANIFOLD AIR TEMP SENSOR RESISTANCE table. Replace sensor if necessary.
- Check continuity between engine controller wiring harness terminal No. 2 and sensor connector terminal. Also check continuity between engine controller wiring harness terminal No. 4 and sensor connector terminal. Repair wiring if an open circuit is indicated.
NOTE:
Also see coolant temperature sensor tests in appropriate TESTS W/CODES
article in this section.
COOLANT TEMP SENSOR & MANIFOLD AIR TEMP SENSOR RESISTANCE
| Temperature °F (°C) | Minimum Ohms | Maximum Ohms |
|---|---|---|
| -40 (-40) | 291,490 | 381,710 |
| -4 (-20) | 85,850 | 108,390 |
| 14 (-10) | 49,250 | 61,430 |
| 32 (0) | 29,330 | 35,990 |
| 50 (10) | 17,990 | 21,810 |
| 68 (20) | 11,370 | 13,610 |
| 77 (25) | 9120 | 10,880 |
| 86 (30) | 7370 | 8750 |
| 104 (40) | 4900 | 5750 |
| 122 (50) | 3330 | 3880 |
| 140 (60) | 2310 | 2670 |
| 158 (70) | 1630 | 1870 |
| 176 (80) | 1170 | 1340 |
| 194 (90) | 860 | 970 |
| 212 (100) | 640 | 720 |
| 230 (110) | 480 | 540 |
| 248 (120) | 370 | 410 |