![]() ![]() Newer Nissan vehicles will beep the horn twice if the tires are being overfilled. Some vehicles have special signals to help you fill the tires correctly. Fill each tire to the pressure specified in the manual or the information panel on the inner door jamb. If you see this while you’re driving, pull over as soon as it is safe to do so, and check the tire pressure on all wheels. If a tire has low pressure, the dashboard TPMS light will illuminate. This indicator often looks like a tire viewed from the front with an exclamation point inside it. When the car starts, the TPMS light will normally illuminate for a second or two. The ECU analyzes it and sends a signal if one of the tires has low pressure, as it will rotate differently than the others. ![]() Indirect TPMS monitoring uses wheel speed sensors to give information about the rotation of the tires. Each quadrant has a physical tire sensor or transmitter, often attached to the inside part of the valve stem (where the air is supposed to go in and out of the tire). The direct system is used in the majority of cars. The tire pressure is measured independently for each wheel, and some cars will even tell you each individual tire pressure right from your instrument cluster. There are a couple of ways that the tire pressure is measured and sent to the ECU in order to signal the driver. 2) Faulty Wheel Speed Sensor, ABS, or ECU (Indirect Systems).1) Malfunctioning TPMS Sensor (Direct Systems). ![]()
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