WARNING: This page is about a different car, the 1996 Mazda B4000, 1996 Mazda B3000, and 1996 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DTC P1505 IAC System CIRCUIT Malfunction (1 OF 2)
Fig 2: DTC P1505 IAC System CIRCUIT Malfunction (2 OF 2)