Battery Temperature Sensor: Description and Operation

CIRCUIT OPERATION
On circuit G31 the ambient temperature sensor draws voltage from the Powertrain Control Module (PCM). The sensor is a variable resistor. As air temperature changes, the resistance in the sensor changes causing a change in current draw. Circuit G31 connects to cavity C15 of the PCM connector.

The PCM provides a ground for the ambient temperature sensor signal (circuit G31) through circuit K4. The K4 circuit connects to cavity A4 of the PCM connector.