Pinpoint Test T : B1B71:21, B1B71:22, B1B71:2F: Notes
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Automatic Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
Evaporator temperature sensor, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor: Signal Amplitude < Minimum | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the BCM senses lower than expected voltage from the evaporator temperature sensor. |
| B1B71:22 | Evaporator Temperature Sensor: Signal Amplitude > Maximum | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses greater than expected voltage from the evaporator temperature sensor. |
| B1B71:2F | Evaporator Temperature Sensor: Signal Erratic | This on-demand DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
Possible Sources
- Wiring, terminals or connectors
- Evaporator temperature sensor
- BCM