Pinpoint Test Q : DTC 4-4: Notes
WARNING: This page is about a different car, the 2015 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.
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.