Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Humidity/In-Car Temperature Sensor Test
2010 Acura TL FWD V6-3.5LSECTION Humidity/In-Car Temperature Sensor Test
Humidity/In-car Temperature Sensor Test
Humidity Sensor Test
NOTE: Before testing the sensor, check for HVAC DTCs Initial Inspection and Diagnostic Overview.
1. Remove the humidity/in-car temperature sensor Service and Repair.
2. Connect the humidity/in-car temperature sensor 4P connector.
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode. Measure the voltage between the terminals with the (+) probe on terminal No. 2 and the (-) probe on terminal No. 3 with the connector connected.
4. If the voltage is not as specified, replace the humidity/in-car temperature sensor Service and Repair.
In-car Temperature Sensor Test
NOTE: Before testing the sensor, check for HVAC DTCs Initial Inspection and Diagnostic Overview.
1. Remove the humidity/in-car temperature sensor Service and Repair.
2. Test the humidity/in-car temperature sensor while holding it in front of the dashboard center vent.
- Measure the resistance with the system set to Max Cool.
- Measure the resistance with the system set to Max Hot.
3. Compare the resistance reading between terminals No. 4 and No. 3 of the humidity/in-car temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.
4. If the resistance is not as specified, replace the humidity/in-car temperature sensor Service and Repair.
5. Clear any DTCs set when you disconnected the humidity/in-car temperature sensor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.