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Home / DTC / P0111 — Intake air temperature SNS.range

P0111 — Intake air temperature SNS.range

Detailed page for trouble code P0111.

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Code

P0111

MITSUBISHI P — Powertrain

Intake air temperature SNS.range

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty IAT sensor (NTC thermistor)
  • Open or shorted wiring between IAT sensor and ECM
  • Poor or corroded connector or pins at sensor or ECM
  • Intermittent connection (broken wire, damaged terminal)
  • Incorrect reference voltage or ECU ground problem
  • Aftermarket or incorrect replacement sensor

Symptoms

  • Check Engine MIL illuminated (P0111 stored)
  • Unstable or incorrect intake-air temperature reading on scan tool
  • Poor cold/hot start behavior or extended open-loop operation
  • Rough idle or hesitation under some conditions
  • Higher than normal fuel consumption and altered drivability
  • Possible reduced engine performance or limp behavior depending on other systems

What to check

  • Read and record freeze-frame and live IAT values with scan tool; compare IAT to ambient air temp.
  • Inspect IAT sensor connector and wiring for damage, corrosion, or loose pins.
  • Check for proper reference voltage and ground at the sensor (consult service manual for pinout).
  • Measure sensor voltage at the harness with engine cold and warm; compare to expected trend (voltage should change with temperature).
  • Measure sensor resistance out of circuit at known temperatures (ice water ~0°C, ambient, hot water ~50–60°C) and compare to spec.
  • Perform wiggle test on wiring while monitoring live data for intermittent changes.

Signal parameters

  • Type: NTC thermistor (resistance decreases as temperature increases)
  • Typical signal: 0.1–4.9 V range to ECM (varies by model); cold ≈ higher voltage, warm ≈ lower voltage (verify against service manual)
  • Typical resistance examples (approximate, verify with manual): ~2–10 kΩ at 25°C depending on sensor
  • Reference supply: usually an internal ECU pull-up or 5 V reference and ground — check vehicle-specific values

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data. Note IAT value and ambient conditions.
  2. Visually inspect sensor and harness for damage, contamination, or loose connectors. Repair as needed.
  3. With ignition ON, backprobe sensor connector and verify reference voltage and ground at the ECU connector per service manual.
  4. Measure sensor output voltage with engine cold and warm while monitoring live data. Confirm voltage changes smoothly with temperature changes.
  5. Remove sensor and measure resistance at known temperatures (ice water and warm water). Compare resistance vs temperature curve to OEM specification.
  6. If resistance/voltage out of spec, replace the IAT sensor. If sensor OK but signal abnormal, trace wiring for opens/shorts to power or ground and repair.
  7. If intermittent faults persist, inspect for water ingress or connector corrosion and repair/replace harness or connector as required.
  8. After repairs, clear codes and perform a road test to confirm the fault is resolved. If wiring and sensor check out and fault persists, consider ECM testing or replacement per factory procedure.

Likely causes

  • Damaged harness or pin corrosion at the IAT connector
  • IAT sensor resistance out of specification due to failure
  • Short to battery or ground in IAT circuit
  • Water ingress in the intake air box connector
  • Sensor installed incorrectly or wrong part number

Fault status

⚠️ Status
ECM detected intake air temperature sensor signal out of expected range or inconsistent with ambient/engine conditions (IAT sensor range/performance fault).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0110 P0112 P0113 P0114 P0106 P0115
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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