Modern cars use a variety of sensors to monitor various parameters of the engine
and provide accurate readings to the Engine Control Module (ECM). One such
sensor is the Intake Air Temperature (IAT) sensor, which measures the
temperature of the air entering the engine. If the ECM detects a problem with
the IAT sensor, it will trigger the P0114 code, indicating an Intake Air
Temperature Circuit Intermittent issue. In this guide, we will walk you through
the meaning of this code and how to troubleshoot it.
Step 1: Understanding the P0114 Code
The P0114 code refers to an Intake Air Temperature Circuit Intermittent issue,
indicating that the ECM has detected an intermittent or inconsistent signal from
the IAT sensor. The IAT sensor is responsible for measuring the temperature of
the air entering the engine, and this information is used by the ECM to adjust
the fuel injection and ignition timing. When the IAT sensor fails, it can lead
to various engine performance issues, including reduced fuel economy, rough
idle, and stalling.
Step 2: Locating the IAT Sensor
The IAT sensor is usually located near the air filter housing, on the intake
manifold, or on the throttle body. Refer to your car's service manual or consult
with a qualified mechanic to determine the exact location of the IAT sensor in
Step 3: Checking the IAT Sensor Wiring
Before replacing the IAT sensor, check the wiring and connectors for any signs
of damage, corrosion, or loose connections. Use a digital multimeter to check
the continuity of the wiring, and ensure that there is no resistance or open
circuit in the circuit.
Step 4: Testing the IAT Sensor
If the wiring and connectors are in good condition, the next step is to test the
IAT sensor itself. Disconnect the sensor from the wiring harness and use a
multimeter to measure its resistance. Refer to your car's service manual for the
correct resistance values at various temperatures. If the resistance is out of
range or inconsistent with the values specified in the manual, replace the IAT
Step 5: Cleaning or Replacing the Air Filter
A dirty or clogged air filter can also cause intermittent issues with the IAT
sensor, leading to the P0114 code. Check the air filter for any signs of damage,
dirt, or debris, and clean or replace it as necessary.
Step 6: Clearing the Code
After addressing the underlying issue, clear the P0114 code using an OBD-II
scanner or by disconnecting the battery for a few minutes. If the problem
persists, consult with a qualified mechanic for further diagnosis and repair.
The P0114 code is a common issue that can affect the performance and fuel
economy of your car. By following the steps outlined in this guide, you can
diagnose and troubleshoot the IAT sensor circuit intermittent problem and ensure
that your car is running smoothly.