P1113
ToyotaToyota P1113 indicates a circuit malfunction in the Intake Air Temperature (IAT) sensor, specifically an open circuit or a short circuit.
Medium SeverityThe Intake Air Temperature (IAT) sensor is experiencing an electrical fault, either an open circuit or a short circuit. This fault prevents the engine control unit from accurately measuring the temperature of the incoming air, which can lead to incorrect fuel mixture calculations and affect engine performance and fuel economy.
⚠️ Before You Begin (Safety First)
Always disconnect the negative battery terminal before performing any electrical work on your vehicle to prevent accidental shorts or injury. Allow the engine to cool down completely before handling engine components to avoid burns.
Common Symptoms
- Check Engine Light illumination
- Reduced fuel efficiency
- Poor engine performance (hesitation, rough idle)
- Increased exhaust emissions
- Difficulty starting the engine (less common)
Common Causes
- Faulty Intake Air Temperature (IAT) sensor
- Corroded or damaged IAT sensor connector
- Open circuit in the IAT sensor wiring harness
- Short circuit in the IAT sensor wiring harness
- Engine Control Module (ECM) failure (rare)
Frequently reported on: Toyota Camry (2002-2006), Toyota Corolla (2003-2008), Toyota Highlander (2001-2007), Toyota Tacoma (2005-2015)
Diagnostic Steps
- Locate the Intake Air Temperature (IAT) sensor. It is often integrated into the Mass Air Flow (MAF) sensor or located in the intake duct.
- Inspect the IAT sensor wiring harness and connector for any signs of damage, corrosion, or loose connections.
- Disconnect the IAT sensor and use a multimeter to test the resistance of the sensor. Refer to your vehicle's service manual for the expected resistance values at various temperatures.
- Also, test for proper voltage supply to the IAT sensor connector (typically 5V reference) and a good ground.
- If the sensor tests faulty or the wiring/connector is damaged, replace the IAT sensor or repair the wiring.
- Clear the P1113 code using an OBD-II scanner and test drive the vehicle to ensure the repair is successful.
👨🔧 When to Call a Professional
If after checking the wiring and replacing the IAT sensor, the P1113 code persists, or if you are uncomfortable with electrical diagnosis, it is best to consult a professional mechanic as there may be a deeper wiring harness or Engine Control Module (ECM) issue.
Commonly Asked Questions
Can I drive with a P1113 code?
While you can usually drive with this code, it is not recommended for extended periods as it can negatively impact fuel economy, increase emissions, and reduce engine performance over time. It's best to address it promptly.
Where is the IAT sensor located on my Toyota?
The IAT sensor is typically found in the intake air ducting, sometimes integrated into the Mass Air Flow (MAF) sensor, or directly on the intake manifold. Consult your vehicle's service manual for the exact location on your specific model.
How do I test the IAT sensor?
You can test the IAT sensor using a multimeter to measure its resistance across its terminals. The resistance should change predictably with temperature. An open circuit will show infinite resistance, and a short circuit will show very low resistance, often indicating a fault. Compare readings to specifications.
Will a P1113 code prevent my car from passing an emissions test?
Yes, a P1113 code will likely cause your vehicle to fail an emissions test because the faulty IAT sensor can lead to incorrect fuel mixture and higher emissions, preventing the vehicle from meeting regulatory standards.