Removal
- Drain the engine coolant. (2-20)
- Remove the air cleaner chamber and throttle body. (6-13)
- Disconnect the ECT sensor coupler 1.
- Remove the rear intake pipe and thermostat assembly. (3-13)
- Remove the ECT sensor 2.
Inspection
- Check the ECT sensor by testing it at the bench as shown in the figure. Connect the ECT sensor 1 to a circuit tester and place it in the oil 2 contained in a pan, which is placed on a stove.
- Heat the oil to raise its temperature slowly and read the column thermometer 3 and the ohmmeter.
- If the ECT sensor ohmic value does not change in the proportion indicated, replace it with a new one.
Temperature sensor specification
| Temperature | Standard resistance |
| 20°C (68°F) | Approx. 2.45 kΩ |
| 50°C (122°F) | Approx. 0.811 kΩ |
| 80°C (176°F) | Approx. 0.318 kΩ |
| 110°C (230°F) | Approx. 0.142 kΩ |
Cooling fan operating temperature:
- Standard (OFF→ON): Approx. 105°C (221°F)
- (ON→OFF): Approx. 100°C (212°F)
Note: As coolant temperature rises, the cooling fan operates for 5 seconds when the temperature arrives each at 50 - 70°C (122 -158°F), 70 - 90°C (158 - 194°F) and 90 - 110°C (194 -230°F)/above 4 000 r/min.
If the resistance is noted to show infinity or too much different resistance value, replace the ECT sensor with a new one.
Caution:
- Take special care when handling the ECT sensor. It may cause damage if it gets a sharp impact.
- Do not contact the ECT sensor and the column thermometer with a pan.
Installation
- Install the new sealing washer 1.
- Tighten the ECT sensor 2 to the specified torque.
- ECT sensor: 18 Nm (1.8 kgf·m, 13.0 lb·ft)
Caution:
- Replace the removed sealing washer 1 with a new one.
- Take special care when handling the ECT sensor. It may cause damage if it gets a sharp impact.
