The tire pressure sensor doesn't actually measure the tire pressure. It uses the wheel speed sensor (part of the ABS) to measure very minute differences in rotational speed between all four tires. When it senses a difference from what a nominally good tire is, it will turn on the tire pressure light. Note that you will need to check the tire pressure in all tires, as it doesn't indicate which tire is the problem. Once the tire pressure is adjusted, reset the light according to the owner's manual. You'll also need to do this after changing to a spare.
Check to make sure you have vacuum with no leaks at the map sensor. Also make sure the three wire connector is plugged in good and the wires are intact. Some models have a rubber seal that cracks or swells and creates vacuum leak causing code. Your particular vehicle is notable for bad map sensors.. The map sensor is located in three places the fire wall of the engine compartment, the air cleaner(held to it with a clip), or directly to your intake (newer models) Yours is in the air cleaner or on a bracket pass side of motor i think...
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The tire pressure sensor doesn't actually measure the tire pressure. It uses the wheel speed sensor (part of the ABS) to measure very minute differences in rotational speed between all four tires. When it senses a difference from what a nominally good tire is, it will turn on the tire pressure light. Note that you will need to check the tire pressure in all tires, as it doesn't indicate which tire is the problem. Once the tire pressure is adjusted, reset the light according to the owner's manual. You'll also need to do this after changing to a spare.
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RE:
How does a "low tire" sensor work?
My 2008 Honda has a dash light that comes on when a tire has low air pressure. How can it do that? The tires aren't hooked up to anything.
It uses a sensor inside the wheel, behind the valve stem. This system is called TPMS Tire pressure monitoring system.
When tire pressure is low, it sends out a signal to a reciever that indicates which tire is low, then your indicator lights come on.
These sensors are battery powered, they last about 7-10 years.
They transmit to RF signals.
Check to make sure you have vacuum with no leaks at the map sensor. Also make sure the three wire connector is plugged in good and the wires are intact. Some models have a rubber seal that cracks or swells and creates vacuum leak causing code. Your particular vehicle is notable for bad map sensors.. The map sensor is located in three places the fire wall of the engine compartment, the air cleaner(held to it with a clip), or directly to your intake (newer models) Yours is in the air cleaner or on a bracket pass side of motor i think...
There's actually two different types, direct and indirect. What the other guy described was indirect.
http://en.wikipedia.org/wiki/Tire_pressure_monitor...