Circuit Description
The driver information center (DIC) 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 DIC senses a larger voltage drop across the sensor, indicating a lower temperature. As the resistance of the ambient air temperature sensor decreases, the driver information center senses a smaller voltage drop across the sensor, indicating a higher temperature.
Conditions for Running the DTC
The DIC must be fully operational within a continuous voltage supply of 9.0-16.0 volts.
Conditions for Setting the DTC
The DIC detects that the temperature is greater than 140°C (284°F) for more than 2 seconds.
Action Taken When the DTC Sets
SC is displayed by the DIC in the compass/temperature mode when the condition 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 DIC receives the clear code command from the scan tool. |
Test Description
The number below refer to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Driver Information System Schematics | |||
1 | Did you perform the Driver Information Center Diagnostic System Check? | Go to Step 2 | |
2 | Turn the ignition ON, with the engine OFF. Does the DIC display SC? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
Does the DIC display OC? | Go to Step 5 | Go to Step 4 | |
4 | Test the signal circuit of the ambient air temperature sensor for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the ambient air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the DIC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Gage Sensor Replacement . Did you complete the replacement? | Go to Step 9 | -- |
8 |
Important: Calibrate the compass on the replacement DIC. Refer to Electronic Compass Calibration . Replace the DIC. Refer to Driver Information Center Replacement . Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
