DTC P1746: EPC Solenoid Open Circuit Or DTC P1747: EPC Solenoid Short Circuit: Description
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1746 or P1747 is set when PCM detects (after 2 drive cycles) an open or short in EPC solenoid circuit.