Possible Causes

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 104-pin harness connector terminal No. 88
Open circuit in White wire between main relay harness connector terminal "C" and MAF/IAT sensor 5-pin harness connector terminal "A"
PCM malfunction
Short to ground circuit in Gray/Black wire between MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 104-pin harness connector terminal No. 88