Coolant Temperature Sensor
- Turn ignition off. Remove coolant temperature sensor connector. Connect ohmmeter between sensor connector terminal No. 1 and ground and between terminal No. 2 and ground. Ensure readings are as specified. See COOLANT TEMPERATURE SENSOR RESISTANCE table.
- Turn ignition on. Using voltmeter, check voltage between connector terminal No. 1 and ground, and between terminal No. 2 and ground. Voltage readings should be 4.5-5.5 volts. If voltage is not as specified, repair break in wiring. If wiring is okay, replace FICU.
COOLANT TEMPERATURE SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 68 (20) | 2200-2600 |
| 104 (40) | 1000-1400 |
| 176 (80) | 285-315 |
| 212 (100) | 180-220 |