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.
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HOMESERVICE MANUALSMITSUBISHI2009LANCER L4-2.4L (4B12)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGAMBIENT TEMPERATURE SENSOR / SWITCH HVACTESTING AND INSPECTION
2009 Mitsubishi Lancer L4-2.4L (4B12)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Testing and Inspection
INSPECTION
AMBIENT AIR TEMPERATURE SENSOR CHECK
CAUTION: The ambient air temperature sensor should be checked without removing it. If the sensor is removed, it is no longer serviceable.
Measure the resistance between the sensor terminals under least two temperatures. The resistance values should meet the values shown.
NOTE: The temperature should be within the shown range.
AMBIENT AIR TEMPERATURE SENSOR CHECK
CAUTION: The ambient air temperature sensor should be checked without removing it. If the sensor is removed, it is no longer serviceable.
Measure the resistance between the sensor terminals under least two temperatures. The resistance values should meet the values shown.
NOTE: The temperature should be within the shown range.
RENDER: 1.0x
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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.