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.
2009 Acura CSX Base, StandardFACTORY OEM SERVICE PROCEDURE
Outside Air Temperature Sensor Test
WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
before testing the sensor, check for HVAC DTCs (see
GENERAL TROUBLESHOOTING INFORMATION )
- Remove the outside air temperature sensor (see Outside Air Temperature Sensor Replacement )
- Dip the sensor in ice water, and measure the resistance Then pour warm water on the sensor, and check for a change in resistance
- Compare the resistance reading between terminals No 1 and No 2 of the outside air temperature sensor with the specifications shown in the graph, the resistance should be within the specifications
- If the resistance is not as specified, replace the outside air temperature sensor (see Outside Air Temperature Sensor Replacement )
Factory Service Tools
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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.