Evaporator Temperature Sensor / Switch: Testing and Inspection

1. Disconnect the sensor connector at the evaporator case, and by using an ohmmeter, measure the resistance. If the resistance is within ± 10% of value of the characteristic curve, the sensor is functioning normally.




2. If the sensor is normal, there is a malfunction of the air conditioning control unit, and it should be replaced.




1. Dip the thermostat in engine oil.
2. Check for continuity across terminals (1) and ground (SOHC) or (3) and ground (DOHC) when the engine oil is heated.

Standard value:
Continuity at approx. 110°C (230°F) or less at A point
No continuity at approx. 155°C (311°F) or more at B point