Battery Temperature Sensor: Description and Operation

PURPOSE:
The battery temp sensor voltage is used to determine what goal voltage to use for the charging system based on ambient temperature near the battery.

CIRCUIT OPERATION
The battery temperature sensor draws voltage from the Powertrain Control

Module (PCM) on circuit K25. The sensor is variable resistor. As temperature changes, the resistance in the sensor changes causing a change in current draw. Circuit K25 connects to cavity 52 of the PCM connector.

The PCM provides a ground for the battery temperature sensor on circuit K4. Circuit K4 connects to cavity 43 of the PCM connector.

NAME OF CODE:
Battery Temp. Sensor Volts Out of Limit

WHEN MONITORED:
With the ignition key ON.

SET CONDITION:
There is a circuit problem in the sensor circuit internal to the Powertrain Control Module (PCM).

POSSIBLE CAUSES:
- PCM failure