P1111low severityPowertrain
Intake Air Temperature Sensor Circuit Low/Intermittent
on 2005 Hyundai Tucson 2.0L I4 · AWD
What this code means
The PCM has detected an intermittent low-voltage condition on the Intake Air Temperature sensor circuit. The signal drops below the expected minimum voltage sporadically, affecting air density calculations.
Symptoms
- Check Engine Light
- Minor driveability issues during signal dropout
- Slightly rough cold starts
Common causes
- Loose IAT sensor connector
- Corroded IAT sensor wiring
- Intermittent open in IAT sensor circuit
- Faulty IAT sensor with internal intermittent fault
Diagnostic steps
- Wiggle test IAT sensor connector while monitoring voltage on scan tool
- Inspect IAT sensor connector pins for corrosion
- Test IAT sensor resistance at various temperatures
- Check wiring continuity in IAT circuit
Repair notes
Repair or replace the IAT sensor connector; replace the IAT sensor if it has an internal intermittent fault.
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