Circuit Description
The DIC applies 5 volts to the ambient air temperature sensor. The ambient air temperature sensor is a thermistor which will vary in resistance with temperature change. 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 DIC senses a small 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 less than -40°C (-40°F) for more than 2 seconds.
Action Taken When the DTC Sets
OC is displayed by the DIC in the compass/temperature mode when the condition is present.
Conditions for Clearing the DTC
| • | The DTC will become history when the DIC no longer detects a failure. |
| • | The history DTC will clear after 100 fault free ignition cycles. |
| • | You may clear the DTC with a scan tool. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
SCHEMATIC REFERENCE: Driver Information System Schematics | ||||
1 | Did you perform the Driver Information Center Diagnostic System Check? | -- | Go to Step 2 | |
2 | Does the DIC display OC? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
Does the DIC display SC? | -- | Go to Step 5 | Go to Step 4 | |
4 | Test the signal circuit of the ambient air temperature gauge sensor for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 |
5 | Test the ground circuit of the ambient air temperature gauge sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the ambient air temperature gauge sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the DIC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
8 | Replace the ambient air temperature gauge sensor. Refer to Ambient Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 |
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 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
