While testing temperature sensors: Technician A says typically the PCM supplies a reference voltage of 5 volts to the sensor.
Technician B says if the sensor is at its highest value on the scan tool, the sensor or its circuit is shorted.
Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question

​While testing temperature sensors: Technician A says typically the PCM supplies a reference voltage of 5 volts to the sensor.
Technician B says if the sensor is at its highest value on the scan tool, the sensor or its circuit is shorted.
Who is correct?
A)​A only
B)​B only
C)​Both A and B
D)​Neither A nor B

Quizplus · Accepted Answer

Technician A is correct because the Powertrain Control Module (PCM) commonly supplies a 5-volt reference to various sensors, including temperature sensors, for them to function properly. Technician B is also correct because if a sensor displays its highest possible value on a scan tool, it often indicates that the sensor or its circuit is shorted to ground, causing it to read at the extreme end of its range.

​While Testing Temperature Sensors: Technician a Says Typically the PCM

While Testing Temperature Sensors: Technician a Says Typically the PCM