Pinpoint Test Q : DTC 4-4: Notes
Refer to Manual Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
A 5-volt reference voltage is supplied to the temperature and air distribution door actuators from the HVAC control module.
Diagnostic Trouble Code (DTC) Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| 4-4 | Feedback Reference Circuit/Performance | This DTC sets when the HVAC control module senses less than expected voltage on the reference voltage circuit, indicating a short directly to ground or the module senses greater than expected voltage on the sensor reference voltage circuit, indicating a short directly to voltage or an open circuit. |
Possible Sources
- Wiring, terminals or connectors
- Air distribution actuator
- Temperature door actuator
- HVAC control module
Visual Inspection and Diagnostic Pre-checks
Inspect loose or corroded HVAC control module connections.