Technician A says that temperature sensors decrease in resistance as the temperature increases; this is called positive temperature coefficient (PTC). Technician B says that some vehicle manufacturers use a stepped ECT circuit inside the PCM to broaden the accuracy of the sensor. Who is right?

Question

Quizplus · Accepted Answer

Technician B is correct because some vehicle manufacturers do use a stepped ECT circuit to improve sensor accuracy. Technician A is incorrect because a sensor that decreases in resistance with increasing temperature is called a negative temperature coefficient (NTC) sensor, not PTC.

Technician a Says That Temperature Sensors Decrease in Resistance as the Temperature