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P1112

IAT Sensor Intermittent

2000-2003 Ford Excursion 7.3L V8 Power Stroke Diesel

Low SeverityPowertrain

Description

The Intake Air Temperature sensor signal is intermittent. The PCM detects erratic fluctuations in the IAT signal, which affects the air/fuel mixture calculations.

Symptoms

  • Check Engine Light
  • Rough idle when cold
  • Poor cold-start performance
  • Fluctuating idle

Common Causes

  • Loose IAT sensor connector
  • Corroded IAT sensor wiring
  • Faulty IAT sensor
  • Damaged connector pins

Diagnostic Steps

  1. Inspect IAT sensor connector for corrosion or looseness
  2. Wiggle test wiring while monitoring IAT reading
  3. Test IAT sensor resistance (should change smoothly with temperature)
  4. Check wiring continuity

Repair Notes

Repair connector or wiring. Replace IAT sensor if faulty.

Related Codes

P0110Intake Air Temperature (IAT) Sensor 1 CircuitP0112IAT Sensor 1 Circuit Low InputP0113IAT Sensor 1 Circuit High Input

Other Powertrain Codes

P1112 on Other Vehicles

Common Questions

What does code P1112 mean on a 2000-2003 Ford Excursion?

P1112 stands for "IAT Sensor Intermittent". The Intake Air Temperature sensor signal is intermittent. The PCM detects erratic fluctuations in the IAT signal, which affects the air/fuel mixture calculations.

What are the symptoms of P1112 on a Ford Excursion?

Common symptoms of P1112 include: Check Engine Light, Rough idle when cold, Poor cold-start performance, Fluctuating idle.

What causes P1112 on a 2000-2003 Ford Excursion?

Common causes of P1112 include: Loose IAT sensor connector, Corroded IAT sensor wiring, Faulty IAT sensor, Damaged connector pins.

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