Deck 72: Temperature Sensors

Question 1

What type of circuit is shown in this schematic?

A)Step-up transformer circuit
B)Negative temperature coefficient (NTC) thermistor circuit
C)Oxygen (O2S) sensor circuit
D)Positive temperature coefficient (PTC) thermistor circuit

Answer 1

Negative temperature coefficient (NTC) thermistor circuit

Question 2

A P0117 DTC is being discussed. Technician A says that the ECT sensor could be internally shorted to ground. Technician B says that the signal wire could be open. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 2

Technician A only

Question 3

A P0113 DTC is being discussed. Technician A says that the IAT sensor could be internally (electrically) shorted. Technician B says that the PCM could be defective. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 4

Technician A says that other temperature sensors that operate like the ECT include transmission fluid temperature (TFT), and engine oil temperature sensors. Technician B says that all temperature sensors increase in resistance as the temperature decreases. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 5

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?

A)Technician A only
B)Both technicians A and B
C)Technician B only
D)Neither technician A nor B

Question 6

This GM ECT sensor is being tested. The ambient temperature is 90° F. The sensor is ________.

A)Within specification
B)OK
C)Out of specification
D)Not being tested properly