See more of iZombie by logging into Facebook. Message this Page, learn about upcoming events and more. If you don't have a Facebook account, you can create one to see more of this Page.
Since the batteries are entombÂ­ed, a dead or dying one requires the replacement of its entire sensor assembly. When asked how long the sensor batteries will last, industry representatives provide a broad life expectancy range â five to 12 years and up to 100,000 miles are mentioned when addressing estimated life spans.
The Manifold Absolute Pressure (MAP) sensor is used by the Powertrain Control Module (PCM) for engine load input. The PCM uses this input, as well as others, to calculate the correct amount of fuel to inject into the cylinders. The MAP sensor measures the absolute pressure inside the intake manifold of the engine. At sea level, atmospheric pressure is about 14.7 psi (pounds per square inch). When the engine is off, the absolute pressure inside the intake equals atmospheric pressure, so the MAP will indicate about 14.7 psi. At a perfect vacuum, the MAP sensor will read 0 psi. When the engine is running, the downward motion of the pistons create a vacuum inside the intake manifold (For the purposes of engine control, when a technician says vacuum, what they are really saying is pressure that is less than atmospheric pressure).