Signal Waveform & Data
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It is necessary that MAPS should be checked along with TPS, because the MAPS/TPS rationality diagnostic is comprised of two tests. A deceleration test is performed to provide a robust method for detection of an altitude compensated MAPS value that is too high for the deceleration condition. The second test compares the altitude compensated MAP value to both high and low limits, dependent upon throttle position and engine speed. When the MAPS value is out of the threshold range, the MAPS/TPS system is determined to be failed.