Possible Cause

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes are:

Connector or terminal malfunction
MAF/IAT sensor malfunction
Open circuit in Gray/Black wire between MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "1P"
Open circuit in White wire between main relay and MAF/IAT sensor 5-pin harness connector terminal "A"
Short circuit to ground in Gray/Black wire between MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "1P"