1. Check the coolant temperature switch sensor.
a) Using an ohmmeter, check that there is no continuity between the terminals of the sensor-switch when the coolant temperature is above 93°C.
b) Using an ohmmeter, check for conductivity between the terminals of the sensor-switch at a coolant temperature of no more than 83°C.
Coolant Temperature Switch Sensor [Toyota Carina T190]
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