Isolate ICM/PIP Fault
WARNING: This page is about a different car, the 1994 Mazda Navajo and 1994 Mazda B4000. However, it is still accessible from the selected car via links, so may be relevant.
With key off, disconnect PCM. Connect LED test light leads between breakout box pins No. J43 (PIP E) and J7 (ground). Crank engine. If LED test light blinks, replace PCM. If test light does not blink, check PIP for short to ground or power. Repair any problems found. If no problems are found, replace ICM.