Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B0160: Outside Air Temperature (OAT) Sensor Signal Circuit LowDTC B0161: Outside Air Temperature Sensor Signal Circuit Open
DTC B0161: Outside Air Temperature Sensor Signal Circuit High
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Ambient Air Temperature Sensor Signal | B0160 | B0161 | B0161 |
Ambient Air Temperature Sensor Low Reference | -- | B0161 | -- |
Circuit/System Description
The instrument panel cluster (IPC) monitors the signal circuit of the ambient air temperature sensor. The ambient air temperature sensor 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 the ambient air temperature signal circuit and the low reference circuit.
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
B0160
Sets when the instrument panel cluster (IPC) detects that the ambient air temperature is greater than 190°F (88°C) for more than 2 seconds.
B0161
Sets when the IPC detects that the ambient air 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Driver Information Center (DIC) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the ambient air temperature sensor.
- Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
- Ignition ON, verify the driver information center (DIC) displays "OC".
- Ignition ON, install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the DIC displays "SC".
- If all circuits test normal, test or replace the ambient air temperature sensor.
| ⇒ | If greater than the specified value, test the low reference circuit terminal B for an open/high resistance. If the circuit tests normal, replace the IPC. |
| ⇒ | If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the IPC. |
| ⇒ | If not the specified value, test the signal circuit terminal A for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for the IPC replacement, programming and setups |
