Ambient Air Temperature Sensor
The ambient air temperature sensor is a 2 wire negative temperature co-efficient thermistor. A 5 volt reference and signal circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance decreases. The sensor signal varies between 0 to 5 volts. The IPC receives input from the ambient air temperature sensor and converts the signal to a working temperature range.
The ambient temperature range is between -40°C (-40°F) and 60°C (140°F). If the ambient temperature is below 3°C (37°F), the temperature display will toggle every 8 seconds for 2 minutes between the outside temperature and the word ICE. After 2 minutes the ICE feature is disabled. When the temperature is less than - 40°C (-40°F) or when there is an open in the circuit for more than 2 seconds, OC displays. When the temperature is above 60°C (140°F) or when there is a short in the circuit for more than 2 seconds, SC displays.
The ambient air temperature sensor is mounted in the forward engine area of the vehicle. In this position, it is exposed to the airflow through the grill before it reaches the radiators.
The DIC displays the ambient air temperature value that it receives from the IPC. The ambient air temperature is updated or displayed under the following conditions: