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 MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESDIAGNOSTIC TESTSDTC P0111: IAT SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM
1998 Acura 3.5RL Special Edition
DTC P0111: IAT Sensor Circuit Range/Performance Problem
1998 Acura 3.5RL Special EditionSECTION DTC P0111: IAT Sensor Circuit Range/Performance Problem
NOTE:
As intake air temperature increases, IAT sensor resistance decreases.
- Turn ignition off. Disconnect Intake Air Temperature (IAT) sensor 2-pin connector and remove IAT sensor. Reconnect sensor connector. Ensure sensor is exposed to ambient air temperature. Turn ignition on. Using a scan tool, check IAT sensor data. If ambient air temperature is indicated, go to next step. If ambient temperature is not indicated, replace IAT sensor.
- Using a hair dryer, warm IAT sensor. Using scan tool, check IAT sensor data. If IAT sensor temperature increases 1.8°F (1.0°C) or more, problem is intermittent. System is okay at this time. If IAT sensor temperature does not increase as specified, replace IAT 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.