Test Description
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
3. This step checks for a default action by the actuator. The actuator will default to 128 counts if the air temperature door position circuit is open, shorted to ground, or shorted to voltage. It will also default to this value if the low reference circuit or the 5 volt reference circuit is open.
4. Tests for the air temperature actuator operating within its specified range.
5. Tests for the air temperature actuator ignition 3 voltage circuit for an open.
6. Tests the air temperature actuator 5 volt reference circuit for an open
7. Tests the air temperature actuator control circuit for an open, short to ground, or short to voltage.