PINPOINT TEST D : DTCs B1A61:11 OR 15: Notes
Diagnostic Overview
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.
Refer to Automatic Climate Control System , for schematic and connector information.
Normal Operation and Fault Conditions
The in-vehicle temperature and humidity sensor receives a ground from the HVAC module. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls the resistance rises. The HVAC module measures this resistance to determine the temperature at the sensor. The sensor DTCs set if there is a fault in either the temperature or humidity part of the sensor or circuits.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A61:11 | Cabin Temperature Sensor: Circuit Short to Ground | This CMDTC and on demand DTC sets when the HVAC module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. |
| B1A61:15 | Cabin Temperature Sensor: Circuit Short to Battery or Open | This CMDTC and on demand DTC sets when the HVAC module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
Possible Sources
- Wiring, terminals or connectors
- In-vehicle temperature/humidity sensor
- HVAC module
Visual Inspection and Diagnostic Pre-checks
- Make sure the in-vehicle temperature/humidity sensor harness is not chaffed.