The Ambient Temperature Sensor of Toyota Echo measures the temperature of air from outside the vehicle. It permits the HVAC and engine computers to make quick adjustments. As a result, the temperature in the cabin remains comfortable and fuel delivery remains precise. The Ambient Temperature Sensor is located where fresh air is unobstructed. It transmits electrical signals to the automatic climate system to adjust the fan speed. In addition, the powertrain module adjusts the air to fuel ratio to prevent rough running or inefficient combustion when the weather swings. A thermistor-based Ambient Temperature Sensor design applied throughout the life of the Echo lineup makes for no confusing multiple versions with different wiring for owners to deal with. When the Ambient Temperature Sensor is inaccurate, the blower will run either too hard or too soft and the engine will misjudge mixture, similar to a faulty mass air flow reading. It is easy to replace and parts typically rest at a reasonable range, with modest labor costs layered on. Due to the Ambient Temperature Sensor affecting comfort and performance, the quick correction restores the small Toyota Echo's character to its intended balance with original Toyota calibration.
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