P1112 2009 Ford Fusion Code - Intake Air Temperature Sensor Intermittent Condition
Quick Answer
The IAT sensor is a thermistor device in which resistance changes with temperature. Common causes include Faulty Intake Air Temperature Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1112 2009 Ford Fusion indicates Intake Air Temperature Sensor Intermittent Condition.
- Common causes
- Common causes include Faulty Intake Air Temperature Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1112 2009 Ford Fusion Description
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The IAT sensor provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark, and air flow.
The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor.
Currently there are 2 types of IAT sensors used, a stand alone, non-integrated type and an integrated type. Both types function the same, however the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a stand-alone sensor.
What are the Possible Causes of the DTC P1112 2009 Ford Fusion?
- Faulty Intake Air Temperature Sensor
- Intake Air Temperature Sensor harness is open or shorted
- Intake Air Temperature Sensor circuit poor electrical connection
- Damaged Powertrain Control Module (PCM)
How to Fix the DTC P1112 2009 Ford Fusion?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1112 2009 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1112 2009 Ford Fusion Code
1. What does the OBDII code P1112 mean on a 2009 Ford Fusion?
P1112 indicates an intermittent condition with the Intake Air Temperature (IAT) sensor, meaning the sensor's signal is not consistently reaching the engine control module (ECM).
2. What are the symptoms of code P1112 on a 2009 Ford Fusion?
Symptoms may include poor fuel economy, rough idling, reduced engine performance, difficulty starting, or the Check Engine Light turning on.
3. What causes the P1112 code to appear?
Common causes include a faulty IAT sensor, damaged wiring or connectors, corrosion on electrical components, or issues with the ECM.
4. Can I drive my 2009 Ford Fusion with a P1112 code?
While the car may still be drivable, ignoring the issue can lead to poor fuel efficiency and potential engine performance problems. It’s best to address the issue promptly.
5. How can I diagnose a P1112 code?
Start by visually inspecting the IAT sensor and its wiring for damage or corrosion. Use a multimeter to check the sensor's resistance and ensure proper voltage at the connector.
6. How do I fix the P1112 code on a Ford Fusion?
Repairs may involve replacing the faulty IAT sensor, repairing or replacing damaged wiring, cleaning corroded connections, or updating/replacing the ECM if necessary.
7. Where is the Intake Air Temperature (IAT) sensor located on a 2009 Ford Fusion?
The IAT sensor is typically located on the intake manifold or integrated into the Mass Air Flow (MAF) sensor, depending on the engine configuration.
8. How much does it cost to fix a P1112 code on a 2009 Ford Fusion?
The repair cost can range from $50 to $200, depending on whether you need to replace the IAT sensor, repair wiring, or address other related issues.
9. What tools are needed to fix a P1112 code?
You may need a multimeter, OBDII scanner, basic hand tools, and possibly electrical cleaner for cleaning connections.
10. Can a dirty air filter cause a P1112 code?
While unlikely, a severely clogged air filter can indirectly affect the IAT sensor reading. Always check and replace the air filter if it’s dirty.
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