Detection Condition
WARNING: This page is about a different car, the 2003 Mazda MPV and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
PCM monitors differences between intake manifold vacuum and atmospheric pressure at idle, which BARO sensor detects by switching EGR boost sensor solenoid. If difference is less than 1.9 in. Hg, DTC is set. This is a continuous monitor. MIL is illuminated if PCM detects malfunction in 2 consecutive drive cycles.