Error P0110 - Intake air temp sensor
Error code P0110 occurs when there is a general problem in the intake manifold air temperature sensor circuit. During diagnostics, it stands for “Intake air temperature sensor malfunction” (IAT), and in the English version it is called Intake air temp-sensor circuit malfunction. Unlike similar errors: P0111 (DTVV failure), P0112 (low signal level from the sensor) and P0113 (high level), error P0110 does not indicate specific reasons for the occurrence, since it can be either a simple open circuit or short circuit, or and sensor failure. There are three ways to solve the problem : cleaning the sensor, checking the contact wires to it, and replacing it.
The sensor is installed on or behind the air filter box. However, its execution may vary. In some cases it has its own body. In others, it is part of the mass air flow sensor.
Causes of error P0110
The most common causes of the P0110 code are:
- Abnormal (compared to the value specified in the manufacturer's specifications) voltage in the intake air temperature sensor circuit
- Intake air temperature sensor malfunction
- Damage to the electrical wires or the IAT sensor connector, or the electrical wires or sensor itself being too close to higher voltage components (such as the alternator, ignition wires, etc.), which could cause interference affecting the signal sent to the ECM car
- Worn or damaged internal components of the intake air temperature sensor
- The intake air temperature sensor is not functioning properly, causing the sensor to send incorrect signals to the vehicle's ECM, which in turn cannot synchronize the operation of the intake air temperature sensor, throttle position sensor, manifold air pressure sensor, and mass air flow sensor, which is necessary for proper engine operation
- Low fuel pressure or damage to internal engine components (such as a burnt valve). In rare cases, the problem may be a faulty engine control module (ECM)
Causes of P0110
Depending on the year, make, and model, the P0110 trouble code can have several causes. Here are some of the most common ones.
- Faulty IAT sensor. Like all solid-state components, the sensor may no longer function properly due to manufacturing defects or damage.
- Sensor contamination. If the IAT sensor is dirty, such as from a poorly installed air filter or excessive crankcase ventilation (PCV), it may fail or not respond quickly enough to temperature changes.
- Incorrect installation. The IAT sensor must be completely in the engine intake air flow. If the sensor comes into contact with a metal surface, such as one installed in the intake manifold, this may cause it to break or become unresponsive to temperature changes.
- Wiring fault. This could be damage to the wiring harness or connector.
Diagnosing the P0110 trouble code is not particularly difficult. The sensor itself is easy to operate, making it easy to check. On the other hand, if you need to trace an open or short in a wiring harness, it will take time and patience.
Depending on the year of manufacture and model of the car, the cost of the sensor may be low. But if it is part of the MAF sensor, it will significantly increase the price.
How does a mechanic diagnose a P0110 code?
First, the mechanic will connect the OBD-II scanner to the vehicle's diagnostic port and read all the stored data and error codes. He will then clear the error codes from the computer's memory and test drive the vehicle to see if the P0110 code appears again. If the error code appears again, the mechanic will check the voltage at the intake air temperature sensor using a digital multimeter. The voltage is usually 5 V. If the voltage is abnormal, the problem is most likely a faulty intake air temperature sensor. The mechanic will also check the electrical wires and sensor connector for looseness or damage.
How to Troubleshoot or Reset Trouble Code P0110
Some suggested steps to troubleshoot and fix error code P0110:
- Check the IAT sensor wiring or connectors for a problem. You must repair or replace these components if they are in poor condition.
- Make sure the intake air temperature sensor is installed correctly and in the correct location. Make appropriate adjustments.
- Use a fault scanner to check the IAT sensor readings. If the engine is cold, the readings should match those of the coolant temperature sensor. If there are differences in comparison, measure the resistance at the two terminals of the IAT sensor. It must be replaced if it does not meet the resistance requirements.
- Check continuity between ground and IAT sensor signal cable.
- Make sure 5 volts is present. Repair if necessary.
How serious is the P0110 code?
The P0110 code is quite serious because it can cause problems with the engine. Under certain circumstances, damage or failure of the intake air temperature sensor can lead to increased fuel consumption, unstable engine operation, decreased engine power, and engine starting problems. If the problem is left unaddressed for a long time, it can cause damage to other components of the car. If this code is detected, it is recommended that you contact a qualified technician as soon as possible to diagnose and resolve the error.
Often, if the Check Engine Light comes on immediately after starting the engine, the OBD-II system can be reset and the vehicle will continue to operate normally.
Vehicle behavior when an error occurs
Error P0110 does not in any way affect the behavior of the car in the warm season. Consequently, the engine operates in normal mode, but in the cold season it will take longer to warm it up. The error will be indicated to you by the corresponding indicator on the car’s dashboard. In this case, to identify the exact code, you must use a special diagnostic tool.
How to determine the P0110 error code
There is a high probability that in severe frost the car will have difficulty starting, and the engine speed will fluctuate greatly. This is due to insufficient fuel supply. After all, with error P0110, the ECM goes into emergency mode . In this case, the processor takes the intake air temperature as +20°C by default. That is, it excludes objective information from the IAT (air temperature sensor). Normal operation will only be possible if the faults are corrected. And there can be many of them.
What repairs can fix the P0110 code?
- Check for the error code using a scan tool, clear the code from your computer's memory, and test drive the vehicle to see if the P0110 code appears again.
- If the error code appears again, reconnect, repair, or replace the electrical wires or intake air temperature sensor connector
- If the electrical wires or sensor connector are OK, replace the Intake Air Temperature Sensor or Engine Control Module (ECM).
Symptoms of malfunction
The main driver symptom of P0110 is the MIL (Malfunction Indicator Light) illumination. It is also called Check engine or simply “check light”.
They can also appear as:
- The “Check engine” warning light on the control panel will light up (the code will be stored in the ECM memory as a malfunction).
- The vehicle engine may become unstable under load or acceleration.
- The engine runs on a fuel mixture that is too lean or too rich depending on the outside temperature.
- But more often, no symptoms are felt.
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