Standard Values for Intake Air Temperature Sensor?

[Gilbert]

Under normal conditions, the resistance is approximately 2-3 kiloohms at 20°C and about 0.4-0.7 kiloohms at 80°C. If the measured values do not meet the specified requirements, the sensor should be replaced. When the intake air temperature sensor installed inside the air flow sensor is damaged, the air flow sensor should be replaced. Below is additional information about the intake air temperature sensor: 1. Function: The intake air temperature sensor is essentially a negative temperature coefficient thermistor. Its role is to transmit the intake air temperature to the ECU in the form of a voltage signal, which the ECU then uses as a correction signal for fuel injection and ignition. 2. Location: The intake air temperature sensor is typically installed in the intake pipe or within the air flow meter. 3. Damage Consequences: If the engine's intake air temperature sensor is damaged, the ECU not only fails to accurately use it as a correction signal for fuel injection and ignition but may also receive incorrect information, leading to issues such as difficulty starting the engine, unstable idle speed, and increased exhaust emissions.

[Eden]

I often ponder about various car sensors, particularly the intake air temperature sensor. Its standard value mainly refers to the normal operating range during proper functioning, which depends on environmental conditions and engine operating status. During cold starts, the temperature range is typically around ambient temperature, say from -40°C to +40°C or so; once the engine is running, the temperature can rise above 150°C because the intake air heats up. The ECU uses this data to adjust fuel injection for more efficient combustion. If readings are abnormal—like persistently showing too cold or too hot—it might indicate a dirty sensor, wiring issues, or ECU malfunction, which directly affects fuel consumption and power output. During routine maintenance, pay attention to cleaning the area around the sensor to reduce dust buildup, which can extend its lifespan.