B0161
DTC B0161
CIRCUIT DESCRIPTION
The instrument panel cluster (IPC) monitors the signal circuit of the ambient air temperature sensor. The ambient air temperature is a thermistor which varies in resistance as the temperature changes. As the resistance of the ambient air temperature sensor increases, the IPC senses a larger voltage drop across the sensor, indicating a lower temperature. As the resistance of the ambient air temperature sensor decreases, the IPC senses a smaller voltage drop across the sensor, indicating a higher temperature. The ambient air temperature is displayed in the DIC by the IPC. The ambient air temperature sensor is interfaced with the IPC via two discreet inputs.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
- DTC B0160 Outside Air Temperature Sensor Circuit Low
- DTC B0161 Outside Air Temperature Sensor Circuit High
CONDITIONS FOR RUNNING THE DTC
The IPC must be fully operational within a continuous voltage supply of 9-16 volts.
CONDITIONS FOR SETTING THE DTC
DTC B0160 sets when the instrument panel cluster (IPC) detects that the temperature is greater than 190°F (88°C) for more than 2 seconds.
DTC B0161 sets when the IPC detects that the temperature is less than -40°F (-40°C) for more than 2 seconds.
ACTION TAKEN WHEN THE DTC SETS
- "SC" is displayed in the DIC by the IPC when the ambient air temperature sensor resistance value is less than the lowest ambient air temperature sensor resistance threshold and DTC B0160 is present.
- "OC" is displayed in the DIC by the IPC when the ambient air temperature sensor resistance value is greater than the highest ambient air temperature sensor resistance threshold and DTC B0161 is present.
CONDITIONS FOR CLEARING THE DTC
- The DTC becomes history when the DIC no longer detects a failure.
- The history DTC clears after 100 fault-free ignition cycles.
- The IPC receives the clear code command from the scan tool.
TEST
