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
- Inspect IAT sensor connector for corrosion or looseness
- Wiggle test wiring while monitoring IAT reading
- Test IAT sensor resistance (should change smoothly with temperature)
- Check wiring continuity
Repair Notes
Repair connector or wiring. Replace IAT sensor if faulty.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
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.