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.
DTC is set, when the difference in manifold pressure is too large between when EGR is open and closed. This is an intermittent monitor. MIL is illuminated if PCM detects malfunction in 2 consecutive drive cycles.