Symptoms (DTCs: P0500, P0503 and/or P1501)

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

Firm shirt feel, abnormal schedules, unexpected downshifts may occur at close throttle.
No 4GR operation. Engine parking in 2nd and 3rd gear. No torque converter clutch application.
Illuminate MIL (P0500) and flush O/D OFF indicator (P0503).