10502173

ENGINE COOLANT TEMPERATURE (ECT) SENSOR

CIRCUIT DIAGRAM

SENSOR CHECKING

USING HI-SCAN (PRO)

Check item	Data display	Check conditions	Intake air temperature	Test specification
Engine coolant temperature sensor	Sensor temperature	Ignition switch : ON or engine running	When -20°C (-4°F)	-20°C
			When 0°C (32°F)	0°C
			When 20°C (68°F)	20°C
			When 40°C (104°F)	40°C
			When 80°C (176°F)	80°C

USING MULTI-METER

1.

Remove the engine coolant temperature sensor from the intake manifold.

2.

With the temperature sensing portion of the engine coolant temperature sensor immersed in hot engine coolant, check the resistance.

Temperature [°C (°F)]	Resistance (kΩ)	Voltage (V)
0 (32)	5.9	3.4 ~ 3.6
20 (68)	2.5	2.5 ~ 2.7
40 (104)	1.1	1.5 ~ 1.7
80 (176)	0.3	0.5 ~ 0.7

3.

If the resistance deviates from the standard value greatly, replace the sensor.

HARNESS INSPECTION PROCEDURES

TROUBLESHOOTING PROCEDURES

TROUBLEHSOOTING HINTS

INSTALLATION

1.

Apply sealant LOCTITE 962T or the equivalent to the threaded portion.

2.

Install the engine coolant temperature sensor and tighten it to the specified torque.

Tightening torque

Engine coolant temperature sensor :

20~40 Nm (200~400 kg·cm, 14~29 lb·ft)

3.

Securely connect the harness connector.