B1B71:15

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PINPOINT TEST 26: DTCs B1B71:11 AND 15 - HYBRID

See the Tribute Wiring Diagram for schematic information.

Normal Operation

Under normal operation, the evaporator discharge air temperature 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.

- DTC B1B71:11 (Evaporator Temperature Sensor: Circuit Short to Ground) - The module senses excessive voltage drop on the sensor reference voltage circuit, indicating a short directly to ground.
- DTC B1B71:15 (Evaporator Temperature Sensor: Circuit Short to Battery or Open) - The module senses no voltage drop on the sensor reference voltage circuit, indicating a short directly to voltage or an open circuit.

Possible Causes
- Wiring, terminals or connectors
- Evaporator discharge air temperature sensor
- HVAC module

Diagnostic Procedure

Step 1-Step 2:

Step 1-Step 7: