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
PCM malfunction
Short to ground circuit in Blue/Black wire between MAF/IAT sensor 5-pin harness connector terminal "D" and PCM 104-pin harness connector terminal No. 39
Short circuit to each other in wire harness between MAF/IAT sensor 5-pin harness connector terminal "D" (Blue/Black wire) and terminal "E" (Brown wire)