Pinpoint Test D : B1B71:21, B1B71:22, B1B71:2F: Notes
Refer to Manual Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
Refer to A/C Compressor Operation. Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor: Signal Amplitude < Minimum | This DTC sets in continuous memory and on-demand when the BCM senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. |
| B1B71:22 | Evaporator Temperature Sensor: Signal Amplitude > Maximum | This DTC sets in continuous memory when the BCM senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
| B1B71:2F | Evaporator Temperature Sensor: Signal Erratic | This DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
Possible Sources
- Wiring, terminals or connectors
- Evaporator temperature sensor
- BCM