Pinpoint Test N : B1B71:11, B1B71:15
WARNING: This page is about a different variant/trim than selected.
- Refer to Manual Climate Control System
for schematic and connector information.
Normal Operation and Fault Conditions
Evaporator Temperature Sensor, 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 Condition FCIM B1B71:11 Evaporator Temperature Sensor: Circuit Short To Ground Module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. The module disables automatic-recirculation and the compressor is shut off. FCIM B1B71:15 Evaporator Temperature Sensor: Circuit Short To Battery Or Open Module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. The module disables automatic-recirculation and the compressor is shut off. Possible Sources
- Wiring, terminals or connectors
- Evaporator temperature sensor
- FCIM
- NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- N1 CHECK THE EVAPORATOR TEMPERATURE SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect FCIM C2402A.
- Disconnect Evaporator temperature sensor C296.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C2402A-19 Ground
Is any voltage present?
Yes REPAIR the circuit. No GO to N2 - N2 CHECK THE EVAPORATOR TEMPERATURE SENSOR INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C2402A-19 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to N3 No REPAIR the circuit. - N3 CHECK THE EVAPORATOR TEMPERATURE SENSOR INPUT CIRCUIT FOR AN OPEN
Is the resistance less than 3 ohms?
Yes GO to N4 No REPAIR the circuit. - N4 CHECK THE EVAPORATOR TEMPERATURE SENSOR SIGNAL AND SIGNAL RETURN CIRCUITS FOR A SHORT TOGETHER
Is the resistance greater than 10, 000 ohms?
Yes INSTALL a new evaporator temperature sensor. REFER to Evaporator Temperature Sensor . TEST the system for normal operation. If the concern is still present, GO to N5 No REPAIR the circuit. - N5 CHECK FOR CORRECT FCIM (FRONT CONTROLS INTERFACE MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect all the FCIM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Connect the FCIM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to FCIM Guided Routine . No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.