Possible Causes

WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes are:

Damaged MAP sensor (DTCs P0107, P0108 or P0109).
Damaged PCM (DTCs P0107 or P0108)
Loose electrical connection (DTC P0109).
MAP signal shorted to VPWR (DTC P0108).
Open or short circuit to ground (DTC P0107).
VREF circuit open or shorted to ground (DTC P0107).
VREF circuit shorted to VPWR (DTC P0108).