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 MANUALSBUICK1996CENTURY SEDAN L4-2.2L VIN 4REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )TESTING AND INSPECTION
1996 Buick Century Sedan L4-2.2L VIN 4
Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
1996 Buick Century Sedan L4-2.2L VIN 4SECTION Testing and Inspection
SCAN TOOL TESTING
A scan tool displays the temperature of the air entering the engine, which should be close to ambient air temperature when engine is cold, and rise as underhood temperature increases. If the engine has not been run for several hours (overnight), the ECT and IAT temperatures should be close to each other. A fault in the IAT sensor circuit should set either a DTC P0112 or DTC P0113. This DTC charts also contain a chart to check for sensor resistance values relative to temperature.
A scan tool displays the temperature of the air entering the engine, which should be close to ambient air temperature when engine is cold, and rise as underhood temperature increases. If the engine has not been run for several hours (overnight), the ECT and IAT temperatures should be close to each other. A fault in the IAT sensor circuit should set either a DTC P0112 or DTC P0113. This DTC charts also contain a chart to check for sensor resistance values relative to temperature.
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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.